From 51353c7ffdd2ab50523d6c6900cd22601aed6535 Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Wed, 8 Apr 2026 18:07:18 +0200
Subject: [PATCH 1/8] [fix] ensure export directory is correct for heatmap

---
 src/tikzplotly/_heatmap.py | 5 +++--
 src/tikzplotly/_save.py    | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/tikzplotly/_heatmap.py b/src/tikzplotly/_heatmap.py
index afaf6bd..b999927 100755
--- a/src/tikzplotly/_heatmap.py
+++ b/src/tikzplotly/_heatmap.py
@@ -102,9 +102,10 @@ def draw_heatmap(data, fig, img_name, axis: Axis):
 
     img_bytes = fig_copy.to_image(format="png")  # The image created by plotly keeps places around the heatmap
     cropped_image = crop_image(Image.open(io.BytesIO(img_bytes)))   # so we crop all the white around the figure
-    resized_image = resize_image(cropped_image, *figure_data.shape)  # and we resize it so each square is a 1px x 1px square
+    resized_image = resize_image(cropped_image, *figure_data.shape) # and we resize it so each square is a 1px x 1px square
 
-    os.makedirs(os.path.dirname(img_name), exist_ok=True) # Make sure the directory exists
+    dirname = os.path.dirname(img_name) or '.'  # Ensure that dirname is not empty
+    os.makedirs(dirname, exist_ok=True)         # Make sure the directory exists
     resized_image.save(img_name)
 
 
diff --git a/src/tikzplotly/_save.py b/src/tikzplotly/_save.py
index a4e4390..5d880aa 100755
--- a/src/tikzplotly/_save.py
+++ b/src/tikzplotly/_save.py
@@ -78,13 +78,13 @@ def get_tikz_code(
 
             # If x is textual => symbolic x coords
             if all(isinstance(v, str) for v in trace.x):
-                sanitized_trace_x = [sanitize_text(x, keep_space=-1) for x in trace.x]
+                sanitized_trace_x = [sanitize_text(str(x), keep_space=-1) for x in trace.x]
                 axis.add_option("symbolic x coords", "{" + ",".join(sanitized_trace_x) + "}")
                 axis.add_option("xtick", "data")
 
             # If y is textual => symbolic y coords
             if all(isinstance(v, str) for v in trace.y):
-                sanitized_trace_y = [sanitize_text(y, keep_space=-1) for y in trace.y]
+                sanitized_trace_y = [sanitize_text(str(y), keep_space=-1) for y in trace.y]
                 axis.add_option("symbolic y coords", "{" + ",".join(sanitized_trace_y) + "}")
                 axis.add_option("ytick", "data")
 

From f6c48dc15bfd96b301e1749854fdd96d5a2e3422 Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Thu, 9 Apr 2026 09:21:44 +0200
Subject: [PATCH 2/8] [fix+tests] handle correclty plot type mark+lines and add
 color tests #31

---
 requirements.txt                              |  2 +-
 src/tikzplotly/_color.py                      | 19 +++++----
 src/tikzplotly/_scatter.py                    | 15 +++----
 tests/test_colors.py                          | 41 +++++++++++++++++++
 .../test_colors_colors-dict-hit_reference.tex | 17 ++++++++
 .../test_colors/test_colors_hex_reference.tex | 17 ++++++++
 .../test_colors_named-color_reference.tex     | 16 ++++++++
 .../test_colors_non-string_reference.tex      | 16 ++++++++
 .../test_colors_none_reference.tex            | 14 +++++++
 .../test_colors_numpy-array_reference.tex     | 16 ++++++++
 .../test_colors/test_colors_rgb_reference.tex | 17 ++++++++
 ...est_colors_rgba-with-opacity_reference.tex | 17 ++++++++
 ..._colors_rgba-without-opacity_reference.tex | 17 ++++++++
 tox.ini                                       |  2 +-
 14 files changed, 205 insertions(+), 21 deletions(-)
 create mode 100644 tests/test_colors.py
 create mode 100644 tests/test_colors/test_colors_colors-dict-hit_reference.tex
 create mode 100644 tests/test_colors/test_colors_hex_reference.tex
 create mode 100644 tests/test_colors/test_colors_named-color_reference.tex
 create mode 100644 tests/test_colors/test_colors_non-string_reference.tex
 create mode 100644 tests/test_colors/test_colors_none_reference.tex
 create mode 100644 tests/test_colors/test_colors_numpy-array_reference.tex
 create mode 100644 tests/test_colors/test_colors_rgb_reference.tex
 create mode 100644 tests/test_colors/test_colors_rgba-with-opacity_reference.tex
 create mode 100644 tests/test_colors/test_colors_rgba-without-opacity_reference.tex

diff --git a/requirements.txt b/requirements.txt
index 58bc7e0..9c4c3f3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 numpy
 plotly
 pillow
-kaleido
+kaleido<1.0.0
 tox
 pandas
 mkdocs-material[recommended]
diff --git a/src/tikzplotly/_color.py b/src/tikzplotly/_color.py
index 21ed038..21d9b9b 100644
--- a/src/tikzplotly/_color.py
+++ b/src/tikzplotly/_color.py
@@ -30,7 +30,7 @@ def convert_color(color):
         string from plotly color palette, can be one of the following:
         - hex string : "#______"
         - rgb string : "rgb(__, __, __)" with values between 0 and 255
-        - rgba string : "rgba(__, __, __, __)" with values between 0 and 255 and an opacity value between 0 and 1
+        - rgba string : "rgba(__, __, __[, __])" with values between 0 and 255 and an opacity value between 0 and 1 (optional)
         - color name : "red", "green", "blue", "yellow", "orange", "purple", "brown", "black", "gray", "white" or any other color name from
                         https://github.com/plotly/plotly.py/blob/main/templategen/utils/colors.py
 
@@ -45,20 +45,21 @@ def convert_color(color):
     if color is None:
         return None, None, None, 1
     if isinstance(color, numpy.ndarray):
-        warn("Color from data is not supported yet. Returning the default color: blue.")
-        return "blue", "HTML", "0000ff", 1
+        warn("Color from data is not supported yet. Returning no color.")
+        return None, None, None, 1
     if not isinstance(color, str):
-        warn(f"Color {color} type '{color.__class__.__name__}' is not supported yet. Returning the default color: blue.")
-        return "blue", "HTML", "0000ff", 1
+        warn(f"Color {color} type '{color.__class__.__name__}' is not supported yet. Returning no color.")
+        return None, None, None, 1
 
     if color.startswith("#"):
         return color[1:], "HTML", color[1:], 1
 
     if color.startswith("rgba"):
-        sp = color.split("(")[1].split(",")
-        rgb_color = sp[:-1]
-        rgb_color = convert_color(f"rgb({rgb_color[0]},{rgb_color[1]},{rgb_color[2]})")[:-1]
-        return rgb_color + (float(sp[-1][:-1]),)
+        sp = color.split("(")[1].replace(')', '').split(",")
+        rgb_color = [s.strip() for s in sp]
+        r, g, b = int(rgb_color[0]), int(rgb_color[1]), int(rgb_color[2])
+        opacity = float(rgb_color[3]) if len(rgb_color) == 4 else 1.0
+        return hashlib.sha1(f"{r}, {g}, {b}".encode('UTF-8')).hexdigest()[:10], "RGB", rgb_str(r, g, b), opacity
 
     if color.startswith("rgb"):
         color = color[4:-1].replace("[", "{").replace("]", "}")
diff --git a/src/tikzplotly/_scatter.py b/src/tikzplotly/_scatter.py
index a064a8a..d766ea1 100644
--- a/src/tikzplotly/_scatter.py
+++ b/src/tikzplotly/_scatter.py
@@ -53,15 +53,17 @@ def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
     options_dict = {}
     mark_option_dict = {}
 
-    if mode == "markers":
+    if "markers" in mode:
         if marker.symbol is not None:
             symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
             options_dict["mark"] = symbol
-            options_dict["only marks"] = None
+            if "lines" not in mode:
+                options_dict["only marks"] = None
             if symbol_options is not None:
                 mark_option_dict[symbol_options[0]] = symbol_options[1]
         else:
-            options_dict["only marks"] = None
+            if "lines" not in mode:
+                options_dict["only marks"] = None
 
         if scatter.marker.size is not None:
             options_dict["mark size"] = px_to_pt(marker.size)
@@ -93,13 +95,6 @@ def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
     elif mode == "lines":
         options_dict["mark"] = "none"
 
-    elif "lines" in mode and "markers" in mode:
-        if marker.symbol is not None:
-            symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
-            options_dict["mark"] = symbol
-            if symbol_options is not None:
-                mark_option_dict[symbol_options[0]] = symbol_options[1]
-
     else:
         warn(f"Scatter : Mode {mode} is not supported yet.")
 
diff --git a/tests/test_colors.py b/tests/test_colors.py
new file mode 100644
index 0000000..117a497
--- /dev/null
+++ b/tests/test_colors.py
@@ -0,0 +1,41 @@
+import os
+import pathlib
+
+import numpy
+import plotly.graph_objects as go
+import pytest
+
+from .helpers import assert_equality
+
+
+this_dir = pathlib.Path(__file__).resolve().parent
+test_name = "test_colors"
+
+
+def plot_color(color_scheme):
+    fig = go.Figure()
+    fig.add_trace(go.Scatter(x=[0, 1, 2, 3, 4], y=[0, 1, 4, 9, 16], marker_color=color_scheme))
+    return fig
+
+
+@pytest.mark.parametrize(
+    "color, warning_match",
+    [
+        pytest.param(None, None, id="none"),
+        pytest.param(numpy.array([1, 2, 3]), "Color from data is not supported yet", id="numpy-array"), # ("blue", "HTML", "0000ff", 1)
+        pytest.param(123, "Color 123 type 'int' is not supported yet", id="non-string"), # ("blue", "HTML", "0000ff", 1)
+        pytest.param("#ffb6c1", None, id="hex"),
+        pytest.param("rgba(255, 182, 193, .2)", None, id="rgba-with-opacity"),
+        pytest.param("rgba(255, 182, 193)", None, id="rgba-without-opacity"),
+        pytest.param("rgb(255, 182, 193)", None, id="rgb"),
+        pytest.param("red", None, id="named-color"),
+        pytest.param("LightBlue", None, id="colors-dict-hit"),
+    ],
+)
+def test_color(color, warning_match, request):
+    id = request.node.callspec.id
+    if warning_match is None:
+        assert_equality(plot_color(color), os.path.join(this_dir, test_name, f"{test_name}_{id}_reference.tex"))
+    else:
+        with pytest.warns(UserWarning, match=warning_match):
+            assert_equality(plot_color(color), os.path.join(this_dir, test_name, f"{test_name}_{id}_reference.tex"))
diff --git a/tests/test_colors/test_colors_colors-dict-hit_reference.tex b/tests/test_colors/test_colors_colors-dict-hit_reference.tex
new file mode 100644
index 0000000..a37cbd4
--- /dev/null
+++ b/tests/test_colors/test_colors_colors-dict-hit_reference.tex
@@ -0,0 +1,17 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+\definecolor{lightblue}{RGB}{173, 216, 230}
+
+\begin{axis}
+\addplot+ [mark options={solid, fill=lightblue}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_hex_reference.tex b/tests/test_colors/test_colors_hex_reference.tex
new file mode 100644
index 0000000..03764a3
--- /dev/null
+++ b/tests/test_colors/test_colors_hex_reference.tex
@@ -0,0 +1,17 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+\definecolor{ffb6c1}{HTML}{ffb6c1}
+
+\begin{axis}
+\addplot+ [mark options={solid, fill=ffb6c1}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_named-color_reference.tex b/tests/test_colors/test_colors_named-color_reference.tex
new file mode 100644
index 0000000..791ec3f
--- /dev/null
+++ b/tests/test_colors/test_colors_named-color_reference.tex
@@ -0,0 +1,16 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+
+\begin{axis}
+\addplot+ [mark options={solid, fill=red}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_non-string_reference.tex b/tests/test_colors/test_colors_non-string_reference.tex
new file mode 100644
index 0000000..b3d5f3d
--- /dev/null
+++ b/tests/test_colors/test_colors_non-string_reference.tex
@@ -0,0 +1,16 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+
+\begin{axis}
+\addplot+ [mark options={solid, fill}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_none_reference.tex b/tests/test_colors/test_colors_none_reference.tex
new file mode 100644
index 0000000..75785aa
--- /dev/null
+++ b/tests/test_colors/test_colors_none_reference.tex
@@ -0,0 +1,14 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+\begin{axis}
+\addplot+ table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_numpy-array_reference.tex b/tests/test_colors/test_colors_numpy-array_reference.tex
new file mode 100644
index 0000000..b3d5f3d
--- /dev/null
+++ b/tests/test_colors/test_colors_numpy-array_reference.tex
@@ -0,0 +1,16 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+
+\begin{axis}
+\addplot+ [mark options={solid, fill}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_rgb_reference.tex b/tests/test_colors/test_colors_rgb_reference.tex
new file mode 100644
index 0000000..bcb9a51
--- /dev/null
+++ b/tests/test_colors/test_colors_rgb_reference.tex
@@ -0,0 +1,17 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+\definecolor{8d466771e5}{RGB}{255, 182, 193}
+
+\begin{axis}
+\addplot+ [mark options={solid, fill=8d466771e5}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_rgba-with-opacity_reference.tex b/tests/test_colors/test_colors_rgba-with-opacity_reference.tex
new file mode 100644
index 0000000..bcb9a51
--- /dev/null
+++ b/tests/test_colors/test_colors_rgba-with-opacity_reference.tex
@@ -0,0 +1,17 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+\definecolor{8d466771e5}{RGB}{255, 182, 193}
+
+\begin{axis}
+\addplot+ [mark options={solid, fill=8d466771e5}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tests/test_colors/test_colors_rgba-without-opacity_reference.tex b/tests/test_colors/test_colors_rgba-without-opacity_reference.tex
new file mode 100644
index 0000000..bcb9a51
--- /dev/null
+++ b/tests/test_colors/test_colors_rgba-without-opacity_reference.tex
@@ -0,0 +1,17 @@
+\pgfplotstableread{
+x y0
+0 0
+1 1
+2 4
+3 9
+4 16
+}\dataA
+
+\begin{tikzpicture}
+
+\definecolor{8d466771e5}{RGB}{255, 182, 193}
+
+\begin{axis}
+\addplot+ [mark options={solid, fill=8d466771e5}] table[y=y0] {\dataA};
+\end{axis}
+\end{tikzpicture}
diff --git a/tox.ini b/tox.ini
index cb3d533..741a24d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,6 @@ deps =
     pytest-codeblocks
     plotly
     pytest-randomly
-    kaleido
+    kaleido<1.0.0
 commands =
     pytest {posargs}
\ No newline at end of file

From a9292fe8f4220e8275398cd9725d55d497869fd7 Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Thu, 9 Apr 2026 09:24:52 +0200
Subject: [PATCH 3/8] fix failing test

---
 tests/test_scatter3d/test_scatter3d_2_markers_reference.tex | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tests/test_scatter3d/test_scatter3d_2_markers_reference.tex b/tests/test_scatter3d/test_scatter3d_2_markers_reference.tex
index 44b1c57..13c7884 100644
--- a/tests/test_scatter3d/test_scatter3d_2_markers_reference.tex
+++ b/tests/test_scatter3d/test_scatter3d_2_markers_reference.tex
@@ -104,9 +104,8 @@
 
 \begin{tikzpicture}
 
-\definecolor{blue}{HTML}{0000ff}
 
 \begin{axis}
-\addplot3+ [mark=diamond*, only marks, mark size=9, mark options={solid, fill=blue, opacity=0.8}] table[x=x, y=y, z=z] {\dataDFHNIDGLEFPCLNOOILBDMAJGJEBAMDGP};
+\addplot3+ [mark=diamond*, only marks, mark size=9, mark options={solid, fill, opacity=0.8}] table[x=x, y=y, z=z] {\dataDFHNIDGLEFPCLNOOILBDMAJGJEBAMDGP};
 \end{axis}
 \end{tikzpicture}

From e1aa83cdd5d881d09e92a08a7d0f4d3696627f5d Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Thu, 9 Apr 2026 18:40:13 +0200
Subject: [PATCH 4/8] [fix] do the same for 3d scatter #31

---
 src/tikzplotly/_scatter3d.py                     | 16 +++++-----------
 .../test_scatter3d_2_markers+lines_reference.tex |  4 +++-
 2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/src/tikzplotly/_scatter3d.py b/src/tikzplotly/_scatter3d.py
index 9ac833e..d338e64 100644
--- a/src/tikzplotly/_scatter3d.py
+++ b/src/tikzplotly/_scatter3d.py
@@ -28,16 +28,17 @@ def draw_scatter3d(data_name, scatter, color_set):
     options_dict = {}
     mark_option_dict = {}
 
-    # Markers only
-    if mode == "markers":
+    if "markers" in mode:
         if marker.symbol is not None:
             symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
             options_dict["mark"] = symbol
-            options_dict["only marks"] = None
+            if "lines" not in mode:
+                options_dict["only marks"] = None
             if symbol_options is not None:
                 mark_option_dict[symbol_options[0]] = symbol_options[1]
         else:
-            options_dict["only marks"] = None
+            if "lines" not in mode:
+                options_dict["only marks"] = None
 
         if marker.size is not None:
             size = marker.size
@@ -72,13 +73,6 @@ def draw_scatter3d(data_name, scatter, color_set):
     elif mode == "lines":
         options_dict["mark"] = "none"
 
-    elif "lines" in mode and "markers" in mode:
-        if marker.symbol is not None:
-            symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
-            options_dict["mark"] = symbol
-            if symbol_options is not None:
-                mark_option_dict[symbol_options[0]] = symbol_options[1]
-
     else:
         warn(f"Scatter3d : Mode {mode} is not supported yet.")
 
diff --git a/tests/test_scatter3d/test_scatter3d_2_markers+lines_reference.tex b/tests/test_scatter3d/test_scatter3d_2_markers+lines_reference.tex
index 019173b..ffca7e9 100644
--- a/tests/test_scatter3d/test_scatter3d_2_markers+lines_reference.tex
+++ b/tests/test_scatter3d/test_scatter3d_2_markers+lines_reference.tex
@@ -103,7 +103,9 @@
 }{\dataDFHNIDGLEFPCLNOOILBDMAJGJEBAMDGP}
 
 \begin{tikzpicture}
+
+
 \begin{axis}
-\addplot3+ [mark=diamond*] table[x=x, y=y, z=z] {\dataDFHNIDGLEFPCLNOOILBDMAJGJEBAMDGP};
+\addplot3+ [mark=diamond*, mark size=9, mark options={solid, fill, opacity=0.8}] table[x=x, y=y, z=z] {\dataDFHNIDGLEFPCLNOOILBDMAJGJEBAMDGP};
 \end{axis}
 \end{tikzpicture}

From 1e698f7b801ee1927e04bd955325cc203f1906e9 Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Sat, 11 Apr 2026 08:52:08 +0200
Subject: [PATCH 5/8] [tests] improve testing process by catching warning and
 explain it in doc #36

---
 .gitignore                                     |  6 ++++--
 docs/develop/contributing.md                   | 16 +++++++++++-----
 docs/develop/tests.md                          |  2 +-
 pyproject.toml                                 |  7 +++++++
 requirements.txt                               |  5 ++++-
 src/tikzplotly/_histogram.py                   |  3 +++
 tests/test_colors.py                           | 18 +++++++++++++++---
 ...olors_transparent_background_reference.tex} |  0
 tests/test_heatmap.py                          | 14 +++++++++-----
 tests/test_histograms.py                       | 11 +++++++++--
 tests/test_markers.py                          |  8 +++++++-
 tests/test_polar.py                            |  4 +++-
 tests/test_scatter.py                          | 14 ++++++++------
 tests/test_scatter3d.py                        | 12 ++++++++++--
 tests/test_specific.py                         | 16 +++++-----------
 tox.ini                                        | 10 ++--------
 16 files changed, 98 insertions(+), 48 deletions(-)
 rename tests/{test_specific/test_specific_transparent_background_reference.tex => test_colors/test_colors_transparent_background_reference.tex} (100%)

diff --git a/.gitignore b/.gitignore
index c3f47ff..ea63bf1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,7 +18,6 @@ src/tests/outputs/**
 # Doxygen output
 doxygen/*
 
-
 # Virtual environment
 .venv/
 *.egg-info/
@@ -29,4 +28,7 @@ dist/
 # Tox
 .tox/
 .coverage
-coverage.xml
\ No newline at end of file
+coverage.xml
+
+# Mkdocs site
+site/**
diff --git a/docs/develop/contributing.md b/docs/develop/contributing.md
index 9bcdd2f..fe96318 100644
--- a/docs/develop/contributing.md
+++ b/docs/develop/contributing.md
@@ -10,7 +10,7 @@ You can also submit a pull request with the desired feature or the correction of
 
 ## Development
 
-The actual code maybe quite messy (is with your contribution you manage to imrpove it, I thank you in advance !).
+The actual code maybe quite messy (is with your contribution you manage to improve it, I thank you in advance !).
 The source code of the package are present in the directory `src/tikzplotly`, in which each file is dedicated to a specific feature of the library.
 
 Some external packages are necessary to make tikzplotly work, that are specified in the `requirements.txt` file.
@@ -40,13 +40,19 @@ tox -- --cov tikzplotly --cov-report html --cov-report term
 
 The code coverage is available in the directory `htmlcov`.
 
-!!! info "Note about coverage"
+!!! Tip "Note about coverage"
     The coverage CI is quite strict, so you need to cover all the modification to pass it.
-    I found that tedious at first, but actually making it pass make me realize that there was some bogs in the code!
+    I found that tedious at first, but actually making it pass make me realize that there were some bogs in the code!
+
+??? Info "Pytest"
+    Some warnings are ignored by `pytest`, as they are intended for the user in some specific cases, that are not relevant in general test cases.
+    This corresponds to:
+    - the warning raised when [heat maps](../plot/supported/#heat-maps) PNG file is not resized (cf [issue comment](https://github.com/thomas-saigre/tikzplotly/issues/6#issuecomment-2106180586)),
+    - warning for features that are not yet implemented (such as text templates, or `barpolar` plots).
 
 
 ## Documentation
 
-Feel free to add some comments on this page, espacially if there are some notable differences between plotly and pgfplots (see [this page](../plot/NB.md)).
-This pages are written in Markdown and are present in the directory `docs`.
+Feel free to add some comments on this page, especially if there are some notable differences between plotly and pgfplots (see [this page](../plot/NB.md)).
+These pages are written in Markdown and are present in the directory `docs`.
 The site is build using [Mkdocs-materials](https://squidfunk.github.io/mkdocs-material/).
diff --git a/docs/develop/tests.md b/docs/develop/tests.md
index af8f468..2dabd97 100644
--- a/docs/develop/tests.md
+++ b/docs/develop/tests.md
@@ -2,7 +2,7 @@
 
 ## Local tests
 
-These tests are for development purpose, to ensure that the features that are developped are working as expected.
+These tests are for development purpose, to ensure that the features that are developed are working as expected.
 They are present in the directory `src/tests` and can be run with the following command, from the `src` directory.
 
 ```bash
diff --git a/pyproject.toml b/pyproject.toml
index 688078b..463c831 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,3 +36,10 @@ dev = ["pandas"]
 [project.urls]
 Code = "https://github.com/thomas-saigre/tikzplotly"
 Issues = "https://github.com/thomas-saigre/tikzplotly/issues"
+
+
+[tool.pytest.ini_options]
+filterwarnings = [
+    "ignore:png image has not been reduced.*:UserWarning",
+    "ignore:Text template is not supported yet.:UserWarning",
+]
diff --git a/requirements.txt b/requirements.txt
index 9c4c3f3..8fe6378 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,11 @@
 numpy
 plotly
 pillow
-kaleido<1.0.0
+kaleido
 tox
 pandas
 mkdocs-material[recommended]
 mkdocs-git-revision-date-localized-plugin
+pytest
+pytest-cov
+pytest-codeblocks
diff --git a/src/tikzplotly/_histogram.py b/src/tikzplotly/_histogram.py
index 6be3c80..6cc4187 100644
--- a/src/tikzplotly/_histogram.py
+++ b/src/tikzplotly/_histogram.py
@@ -92,6 +92,9 @@ def draw_histogram(trace, axis: Axis, colors_set, row_sep="\\\\"):
         axis.add_option("x filter/.expression", "rawy")
         axis.add_option("y filter/.expression", "rawx")
         hist_options["handler/.style"] = "{xbar interval}"
+    else:   # trace.x and trace.y are both empty
+        warn("Normally, we should reach this line")
+        data_str = ""
 
 
 
diff --git a/tests/test_colors.py b/tests/test_colors.py
index 117a497..61cf64f 100644
--- a/tests/test_colors.py
+++ b/tests/test_colors.py
@@ -1,8 +1,10 @@
 import os
 import pathlib
+from contextlib import nullcontext
 
 import numpy
 import plotly.graph_objects as go
+import plotly.express as px
 import pytest
 
 from .helpers import assert_equality
@@ -17,6 +19,12 @@ def plot_color(color_scheme):
     fig.add_trace(go.Scatter(x=[0, 1, 2, 3, 4], y=[0, 1, 4, 9, 16], marker_color=color_scheme))
     return fig
 
+def plot_transparent_background():
+    fig = px.scatter(x=[0, 1, 2, 3, 4], y=[0, 1, 4, 9, 16])
+    fig.update_layout(plot_bgcolor='rgba(255, 182, 193, .5)')
+
+    return fig
+
 
 @pytest.mark.parametrize(
     "color, warning_match",
@@ -35,7 +43,11 @@ def plot_color(color_scheme):
 def test_color(color, warning_match, request):
     id = request.node.callspec.id
     if warning_match is None:
-        assert_equality(plot_color(color), os.path.join(this_dir, test_name, f"{test_name}_{id}_reference.tex"))
+        context = nullcontext()
     else:
-        with pytest.warns(UserWarning, match=warning_match):
-            assert_equality(plot_color(color), os.path.join(this_dir, test_name, f"{test_name}_{id}_reference.tex"))
+        context =  pytest.warns(UserWarning, match=warning_match)
+    with context:
+        assert_equality(plot_color(color), os.path.join(this_dir, test_name, f"{test_name}_{id}_reference.tex"))
+
+def test_transparent_background():
+    assert_equality(plot_transparent_background(), os.path.join(this_dir, test_name, test_name + "_transparent_background_reference.tex"))
diff --git a/tests/test_specific/test_specific_transparent_background_reference.tex b/tests/test_colors/test_colors_transparent_background_reference.tex
similarity index 100%
rename from tests/test_specific/test_specific_transparent_background_reference.tex
rename to tests/test_colors/test_colors_transparent_background_reference.tex
diff --git a/tests/test_heatmap.py b/tests/test_heatmap.py
index 56c795e..bb5c676 100644
--- a/tests/test_heatmap.py
+++ b/tests/test_heatmap.py
@@ -1,6 +1,7 @@
 import plotly.express as px
 import plotly.graph_objects as go
 import numpy as np
+import pytest
 import os
 from .helpers import assert_equality
 import pathlib
@@ -22,6 +23,7 @@ def plot_2():
     return fig
 
 def plot_3():
+    # A plot with no colorscale
     fig = go.Figure(data=go.Heatmap(
                    z=[[1, None, 30, 50, 1], [20, 1, 60, 80, 30], [30, 60, 1, -10, 20]],
                    x=['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'],
@@ -35,7 +37,7 @@ def plot_4():
     programmers = ['Alex','Nicole','Sara','Etienne','Chelsea','Jody','Marianne']
 
     base = datetime.datetime(2021, 7, 20, 19, 30, 0)
-    dates = base - np.arange(180) * datetime.timedelta(days=1)
+    dates = [base - datetime.timedelta(days=int(i)) for i in np.arange(180)]
     np.random.seed(43)
     z = np.random.poisson(size=(len(programmers), len(dates)))
 
@@ -51,7 +53,7 @@ def plot_4():
 
     return fig
 
-def plot_5():
+def plot_empty_trace():
     fig = px.imshow([[1, 20, 30],
                     [20, 1, 60],
                     [30, 60, 1]])
@@ -65,10 +67,12 @@ def test_2():
     assert_equality(plot_2(), os.path.join(this_dir, test_name, test_name + "_2_reference.tex"), img_name="/tmp/tikzplotly/fig2.png")
 
 def test_3():
-    assert_equality(plot_3(), os.path.join(this_dir, test_name, test_name + "_3_reference.tex"), img_name="/tmp/tikzplotly/fig3.png")
+    with pytest.warns(UserWarning, match="No colorscale found, using default"):
+        assert_equality(plot_3(), os.path.join(this_dir, test_name, test_name + "_3_reference.tex"), img_name="/tmp/tikzplotly/fig3.png")
 
 def test_4():
     assert_equality(plot_4(), os.path.join(this_dir, test_name, test_name + "_4_reference.tex"), img_name="/tmp/tikzplotly/fig4.png")
 
-def test_5():
-    assert_equality(plot_5(), os.path.join(this_dir, test_name, test_name + "_5_reference.tex"))
\ No newline at end of file
+def test_empty_trace():
+    with pytest.warns(UserWarning, match="Adding empty trace."):
+        assert_equality(plot_empty_trace(), os.path.join(this_dir, test_name, test_name + "_5_reference.tex"))
\ No newline at end of file
diff --git a/tests/test_histograms.py b/tests/test_histograms.py
index 9253c74..015bdd5 100644
--- a/tests/test_histograms.py
+++ b/tests/test_histograms.py
@@ -2,6 +2,7 @@
 import plotly.graph_objects as go
 import numpy as np
 import os
+from contextlib import nullcontext
 from .helpers import assert_equality
 import pathlib
 import pytest
@@ -77,7 +78,12 @@ def test_3():
 
 @pytest.mark.parametrize("histnorm", ["percent", "probability", "density", "probability density"])
 def test_4(histnorm):
-    assert_equality(plot_4(histnorm), os.path.join(this_dir, test_name, test_name + "_4_reference.tex"))
+    if histnorm in ["percent", "probability", "density"]:
+        context = pytest.warns(UserWarning, match=r"Sorry, I did not find an equivalent for histnorm='\w+' in TikZ*")
+    else:
+        context = nullcontext()
+    with context:
+        assert_equality(plot_4(histnorm), os.path.join(this_dir, test_name, test_name + "_4_reference.tex"))
 
 def test_5():
     assert_equality(plot_5(), os.path.join(this_dir, test_name, test_name + "_5_reference.tex"))
@@ -86,7 +92,8 @@ def test_6():
     assert_equality(plot_6(), os.path.join(this_dir, test_name, test_name + "_6_reference.tex"))
 
 def test_7():
-    assert_equality(plot_7(), os.path.join(this_dir, test_name, test_name + "_7_reference.tex"))
+    with pytest.warns(UserWarning, match="To the best of our knowledge, other aggregate function than 'count' are not supported in pgfplots.*"):
+        assert_equality(plot_7(), os.path.join(this_dir, test_name, test_name + "_7_reference.tex"))
 
 def test_8():
     assert_equality(plot_8(), os.path.join(this_dir, test_name, test_name + "_8_reference.tex"))
diff --git a/tests/test_markers.py b/tests/test_markers.py
index 688bd3c..9811d00 100644
--- a/tests/test_markers.py
+++ b/tests/test_markers.py
@@ -3,6 +3,7 @@
 import pytest
 import numpy as np
 import os
+from contextlib import nullcontext
 from .helpers import assert_equality
 import pathlib
 
@@ -96,7 +97,12 @@ def plot_with_angle():
 
 @pytest.mark.parametrize("symbol", ["circle", 0, "0", "circle-dot"])
 def test_1(symbol):
-    assert_equality(plot_1(symbol), os.path.join(this_dir, test_name, test_name + "_1_reference.tex"))
+    if symbol == "circle-dot":
+        context = pytest.warns(UserWarning, match=r"Dotted markers are not supported \(yet\), the symbol without dot will be used instead.")
+    else:
+        context = nullcontext()
+    with context:
+        assert_equality(plot_1(symbol), os.path.join(this_dir, test_name, test_name + "_1_reference.tex"))
 
 def test_2():
     assert_equality(plot_2(), os.path.join(this_dir, test_name, test_name + "_2_reference.tex"))
diff --git a/tests/test_polar.py b/tests/test_polar.py
index 847a32a..03f36e6 100644
--- a/tests/test_polar.py
+++ b/tests/test_polar.py
@@ -5,6 +5,7 @@
 import plotly.express as px
 import plotly.graph_objects as go
 import pandas as pd
+import pytest
 from .helpers import assert_equality
 
 this_dir = pathlib.Path(__file__).resolve().parent
@@ -275,4 +276,5 @@ def test_polar_1():
     assert_equality(fig_polar_1(), os.path.join(this_dir, test_name, test_name + "_1_reference.tex"))
 
 def test_polar_matplotlib():
-    assert_equality(fig_polar_matplotlib(), os.path.join(this_dir, "empty_plot.tex"))
+    with pytest.warns(UserWarning, match="Trace type barpolar is not supported yet"):
+        assert_equality(fig_polar_matplotlib(), os.path.join(this_dir, "empty_plot.tex"))
diff --git a/tests/test_scatter.py b/tests/test_scatter.py
index 4322cb3..19f0314 100644
--- a/tests/test_scatter.py
+++ b/tests/test_scatter.py
@@ -2,6 +2,7 @@
 import plotly.graph_objects as go
 import numpy as np
 import os
+from contextlib import nullcontext
 from .helpers import assert_equality
 import pathlib
 import pytest
@@ -220,9 +221,6 @@ def test_2():
 def test_tranparent_color():
     assert_equality(plot_transparent_color(), os.path.join(this_dir, test_name, test_name + "_transparent_color_reference.tex"))
 
-# def test_tranparent_color_rgba():
-    # assert_equality(plot_transparent_color_rgba(), os.path.join(this_dir, test_name, test_name + "_transparent_color_rgba_reference.tex"))
-
 def test_3():
     assert_equality(plot_3(), os.path.join(this_dir, test_name, test_name + "_3_reference.tex"))
 
@@ -230,14 +228,18 @@ def test_4():
     assert_equality(plot_4(), os.path.join(this_dir, test_name, test_name + "_4_reference.tex"))
 
 def test_5():
-    assert_equality(plot_5(), os.path.join(this_dir, test_name, test_name + "_5_reference.tex"))
+    with pytest.warns(UserWarning, match="Assuming this is a date*"):
+        assert_equality(plot_5(), os.path.join(this_dir, test_name, test_name + "_5_reference.tex"))
 
 @pytest.mark.parametrize("x, y", [(True, True), (True, False), (False, True)])
 def test_6(x, y):
-    assert_equality(plot_6(x, y), os.path.join(this_dir, test_name, test_name + f"_6_{x}_{y}_reference.tex"))
+    context = pytest.warns(UserWarning, match="Adding empty trace.") if x and y else nullcontext()
+    with context:
+        assert_equality(plot_6(x, y), os.path.join(this_dir, test_name, test_name + f"_6_{x}_{y}_reference.tex"))
 
 def test_7():
-    assert_equality(plot_7(), os.path.join(this_dir, test_name, test_name + "_7_reference.tex"))
+    with pytest.warns(UserWarning, match="Assuming data January is a month*"):
+        assert_equality(plot_7(), os.path.join(this_dir, test_name, test_name + "_7_reference.tex"))
 
 def test_8():
     assert_equality(plot_8(), os.path.join(this_dir, test_name, test_name + "_8_reference.tex"))
diff --git a/tests/test_scatter3d.py b/tests/test_scatter3d.py
index 55f4349..0b3b0d8 100644
--- a/tests/test_scatter3d.py
+++ b/tests/test_scatter3d.py
@@ -2,6 +2,7 @@
 Test of 3D scatter plots https://plotly.com/python/3d-scatter-plots/
 """
 import os, pathlib
+from contextlib import nullcontext
 import plotly.express as px
 import plotly.graph_objects as go
 import numpy as np
@@ -88,7 +89,13 @@ def test_scatter_3d_1():
 
 @pytest.mark.parametrize("mode", ["markers", "markers+lines", "lines"])
 def test_scatter_3d_2(mode):
-    assert_equality(plot_scatter_3d_2(mode), os.path.join(this_dir, test_name, test_name + f"_2_{mode}_reference.tex"))
+    if "markers" in mode:
+        context = pytest.warns(UserWarning, match="Color from data is not supported yet*")
+    #     context = nullcontext()
+    else:
+        context = nullcontext()
+    with context:
+        assert_equality(plot_scatter_3d_2(mode), os.path.join(this_dir, test_name, test_name + f"_2_{mode}_reference.tex"))
 
 def test_scatter_3d_3():
     assert_equality(plot_scatter_3d_3(), os.path.join(this_dir, test_name, test_name + "_3_reference.tex"))
@@ -97,4 +104,5 @@ def test_scatter_3d_view():
     assert_equality(plot_scatter_3d_view(), os.path.join(this_dir, test_name, test_name + "_view_reference.tex"))
 
 def test_scatter_3d_empty():
-    assert_equality(plot_scatter_3d_empty(), os.path.join(this_dir, test_name, test_name + "_empty_reference.tex"))
+    with pytest.warns(UserWarning, match="Adding empty 3D trace."):
+        assert_equality(plot_scatter_3d_empty(), os.path.join(this_dir, test_name, test_name + "_empty_reference.tex"))
diff --git a/tests/test_specific.py b/tests/test_specific.py
index f638320..391b8fb 100644
--- a/tests/test_specific.py
+++ b/tests/test_specific.py
@@ -2,7 +2,7 @@
 In this file are present the test of some very specific usage case, that should occur very rarely.
 """
 import os, pathlib
-import plotly.express as px
+import pytest
 import plotly.graph_objects as go
 from .helpers import assert_equality
 
@@ -29,12 +29,7 @@ def plot_sanitized_text():
 
     return fig
 
-def plot_transparent_background():
-    # TODO: move it into test_color (when created)
-    fig = px.scatter(x=[0, 1, 2, 3, 4], y=[0, 1, 4, 9, 16])
-    fig.update_layout(plot_bgcolor='rgba(255, 182, 193, .5)')
 
-    return fig
 
 def plot_empty_figure():
     fig = go.Figure()
@@ -43,10 +38,9 @@ def plot_empty_figure():
 
 
 def test_sanitized_text():
-    assert_equality(plot_sanitized_text(), os.path.join(this_dir, test_name, test_name + "_sanitized_text_reference.tex"))
-
-def test_transparent_background():
-    assert_equality(plot_transparent_background(), os.path.join(this_dir, test_name, test_name + "_transparent_background_reference.tex"))
+    with pytest.warns(UserWarning, match="Character .+ has been replaced by \"x[0-9a-f]+\" in output file"):
+        assert_equality(plot_sanitized_text(), os.path.join(this_dir, test_name, test_name + "_sanitized_text_reference.tex"))
 
 def test_empty_figure():
-    assert_equality(plot_empty_figure(), os.path.join(this_dir, "empty_plot.tex"))
+    with pytest.warns(UserWarning, match="No data in figure."):
+        assert_equality(plot_empty_figure(), os.path.join(this_dir, "empty_plot.tex"))
diff --git a/tox.ini b/tox.ini
index 741a24d..73c5836 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,13 +4,7 @@ envlist =
 isolated_build = True
 
 [testenv]
-deps =
-    pandas
-    pytest
-    pytest-cov
-    pytest-codeblocks
-    plotly
-    pytest-randomly
-    kaleido<1.0.0
+deps = -rrequirements.txt
 commands =
+    plotly_get_chrome -y
     pytest {posargs}
\ No newline at end of file

From e9384b5c1d0d3ef53bfe474f2bee8f41dafd4d29 Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Sat, 11 Apr 2026 10:45:37 +0200
Subject: [PATCH 6/8] [fix] correctly handle empty histogram

---
 src/tikzplotly/_histogram.py                          |  4 ++--
 tests/test_histograms.py                              |  2 +-
 tests/test_specific.py                                | 11 +++++++++++
 .../test_specific_empty_histogram_reference.tex       |  7 +++++++
 4 files changed, 21 insertions(+), 3 deletions(-)
 create mode 100644 tests/test_specific/test_specific_empty_histogram_reference.tex

diff --git a/src/tikzplotly/_histogram.py b/src/tikzplotly/_histogram.py
index 6cc4187..ef56b72 100644
--- a/src/tikzplotly/_histogram.py
+++ b/src/tikzplotly/_histogram.py
@@ -93,8 +93,8 @@ def draw_histogram(trace, axis: Axis, colors_set, row_sep="\\\\"):
         axis.add_option("y filter/.expression", "rawx")
         hist_options["handler/.style"] = "{xbar interval}"
     else:   # trace.x and trace.y are both empty
-        warn("Normally, we should reach this line")
-        data_str = ""
+        warn("Empty histogram. Returning no plot")
+        return ""
 
 
 
diff --git a/tests/test_histograms.py b/tests/test_histograms.py
index 015bdd5..fb3bd98 100644
--- a/tests/test_histograms.py
+++ b/tests/test_histograms.py
@@ -99,4 +99,4 @@ def test_8():
     assert_equality(plot_8(), os.path.join(this_dir, test_name, test_name + "_8_reference.tex"))
 
 def test_9():
-    assert_equality(plot_9(), os.path.join(this_dir, test_name, test_name + "_9_reference.tex"))
\ No newline at end of file
+    assert_equality(plot_9(), os.path.join(this_dir, test_name, test_name + "_9_reference.tex"))
diff --git a/tests/test_specific.py b/tests/test_specific.py
index 391b8fb..56c302b 100644
--- a/tests/test_specific.py
+++ b/tests/test_specific.py
@@ -4,6 +4,7 @@
 import os, pathlib
 import pytest
 import plotly.graph_objects as go
+import plotly.express as px
 from .helpers import assert_equality
 
 this_dir = pathlib.Path(__file__).resolve().parent
@@ -36,6 +37,12 @@ def plot_empty_figure():
     fig.show()
     return fig
 
+def plot_empty_histogram():
+    # Normally user shouldn't create this kind on figure, but we never know !
+    fig = px.histogram(x=[1])
+    fig.data[0].x = None
+    return fig
+
 
 def test_sanitized_text():
     with pytest.warns(UserWarning, match="Character .+ has been replaced by \"x[0-9a-f]+\" in output file"):
@@ -44,3 +51,7 @@ def test_sanitized_text():
 def test_empty_figure():
     with pytest.warns(UserWarning, match="No data in figure."):
         assert_equality(plot_empty_figure(), os.path.join(this_dir, "empty_plot.tex"))
+
+def test_empty_histogram():
+    with pytest.warns(UserWarning, match="Empty histogram.*"):
+        assert_equality(plot_empty_histogram(), os.path.join(this_dir, test_name, test_name + "_empty_histogram_reference.tex"))
diff --git a/tests/test_specific/test_specific_empty_histogram_reference.tex b/tests/test_specific/test_specific_empty_histogram_reference.tex
new file mode 100644
index 0000000..32f644f
--- /dev/null
+++ b/tests/test_specific/test_specific_empty_histogram_reference.tex
@@ -0,0 +1,7 @@
+\begin{tikzpicture}
+\begin{axis}[
+xlabel=x,
+ylabel=count
+]
+\end{axis}
+\end{tikzpicture}

From 21a6f0bc0232963d54a63f03adca121a017945e1 Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Sat, 11 Apr 2026 12:42:20 +0200
Subject: [PATCH 7/8] [refactor] avoid code duplication between scatter 2d and
 3d

---
 .../{_dataContainer.py => _data_container.py} |  2 +-
 src/tikzplotly/_histogram.py                  | 51 +++++++++----------
 src/tikzplotly/_polar.py                      |  2 +-
 src/tikzplotly/_save.py                       |  4 +-
 src/tikzplotly/_scatter.py                    | 30 +++--------
 src/tikzplotly/_scatter3d.py                  | 33 ++----------
 src/tikzplotly/_trace_utils.py                | 44 ++++++++++++++++
 src/tikzplotly/_utils.py                      | 12 +----
 .../test_markers/test_markers_1_reference.tex |  6 +--
 .../test_markers/test_markers_2_reference.tex |  4 +-
 .../test_markers/test_markers_3_reference.tex |  6 +--
 .../test_markers_angle_reference.tex          |  6 +--
 tox.ini                                       |  2 +-
 13 files changed, 97 insertions(+), 105 deletions(-)
 rename src/tikzplotly/{_dataContainer.py => _data_container.py} (99%)
 create mode 100644 src/tikzplotly/_trace_utils.py

diff --git a/src/tikzplotly/_dataContainer.py b/src/tikzplotly/_data_container.py
similarity index 99%
rename from src/tikzplotly/_dataContainer.py
rename to src/tikzplotly/_data_container.py
index 9ccd493..4db4f2f 100644
--- a/src/tikzplotly/_dataContainer.py
+++ b/src/tikzplotly/_data_container.py
@@ -186,7 +186,7 @@ def add_data3d(self, x, y, z, name=None):
                     return data.name, data.z_name
         data_obj = Data3D(x, y, z, name)
         self.data.append(data_obj)
-        return data_obj.name, data_obj.z_name
+        return data_obj.name
 
     def export_data(self):
         """Generate LaTeX code to export the data from DataContainer.
diff --git a/src/tikzplotly/_histogram.py b/src/tikzplotly/_histogram.py
index ef56b72..2543cd4 100644
--- a/src/tikzplotly/_histogram.py
+++ b/src/tikzplotly/_histogram.py
@@ -50,6 +50,27 @@ def formalize_data(data, axis:Axis, row_sep="\\\\"):
 
     return data_str
 
+def treat_histnorm(histnorm: str, hist_options: dict):
+    """Handle the normalization option of the histogram
+
+    Parameters
+    ----------
+    histnorm : str
+        The normalization mode for the histogram.
+    hist_options : dict
+        Dictionary to store histogram options.
+    """
+    if histnorm in ("percent", "probability", "density"):
+        warn(
+            f"Sorry, I did not find an equivalent for histnorm='{histnorm}' in TikZ. "
+            "If you need this feature implemented, please open an issue, if possible with a MWE pgfplots code "
+            "that would plot this :).\nFor now, the histogram will be plotted without normalization "
+            "(as if histnorm='probability density')."
+        )
+        hist_options["density"] = None
+    elif histnorm in ("probability density", ):
+        hist_options["density"] = None
+
 def draw_histogram(trace, axis: Axis, colors_set, row_sep="\\\\"):
     """
     Draw a histogram and return the TikZ code.
@@ -79,7 +100,8 @@ def draw_histogram(trace, axis: Axis, colors_set, row_sep="\\\\"):
 
     code = ""
 
-    plot_options = {"hist": None}
+    plot_options = {}
+    plot_options["hist"] = None
     type_options = {"row sep": row_sep, "y index": 0}
     hist_options = {}
 
@@ -97,34 +119,10 @@ def draw_histogram(trace, axis: Axis, colors_set, row_sep="\\\\"):
         return ""
 
 
-
     if trace.nbinsx is not None:
         hist_options["bins"] = trace.nbinsx
 
-    if trace.histnorm == "percent":
-        warn(
-            f"Sorry, I did not find an equivalent for histnorm='{trace.histnorm}' in TikZ. "
-            "If you need this feature implemented, please open an issue, if possible with a MWE pgfplots code "
-            "that would plot this :).\nFor now, the histogram will be plotted without normalization "
-            "(as if histnorm='probability density')."
-        )
-        hist_options["density"] = None
-    elif trace.histnorm == "probability":
-        warn(
-            f"Sorry, I did not find an equivalent for histnorm='{trace.histnorm}' in TikZ. "
-            "If you need this feature implemented, please open an issue, if possible with a MWE pgfplots code that would plot this :).\n"
-            "For now, the histogram will be plotted without normalization (as if histnorm='probability density')."
-        )
-        hist_options["density"] = None
-    elif trace.histnorm == "density":
-        warn(
-            f"Sorry, I did not find an equivalent for histnorm='{trace.histnorm}' in TikZ. "
-            "If you need this feature implemented, please open an issue, if possible with a MWE pgfplots code that would plot this :).\n"
-            "For now, the histogram will be plotted without normalization (as if histnorm='probability density')."
-        )
-        hist_options["density"] = None
-    elif trace.histnorm == "probability density":
-        hist_options["density"] = None
+    treat_histnorm(trace.histnorm, hist_options)
 
     if trace.cumulative.enabled:
         hist_options["cumulative"] = None
@@ -155,5 +153,4 @@ def draw_histogram(trace, axis: Axis, colors_set, row_sep="\\\\"):
     code += tex_addplot(data_str, plot_type = "table",
                         options = option_dict_to_str(plot_options), type_options=option_dict_to_str(type_options))
 
-
     return code
diff --git a/src/tikzplotly/_polar.py b/src/tikzplotly/_polar.py
index a293a9a..5d9229f 100644
--- a/src/tikzplotly/_polar.py
+++ b/src/tikzplotly/_polar.py
@@ -7,7 +7,7 @@
 from ._utils import option_dict_to_str
 from ._tex import tex_addplot
 from ._color import convert_color
-from ._dataContainer import DataContainer
+from ._data_container import DataContainer
 
 def get_polar_coord(trace, axis: Axis, data_container: DataContainer):
     """Get polar coordinates from the trace
diff --git a/src/tikzplotly/_save.py b/src/tikzplotly/_save.py
index 5d880aa..ea157ff 100755
--- a/src/tikzplotly/_save.py
+++ b/src/tikzplotly/_save.py
@@ -19,7 +19,7 @@
 from ._axis import Axis
 from ._color import convert_color
 from ._annotations import str_from_annotation
-from ._dataContainer import DataContainer
+from ._data_container import DataContainer
 from ._utils import sanitize_tex_text, sanitize_text
 
 
@@ -173,7 +173,7 @@ def get_tikz_code(
             if hasattr(figure_layout.scene, "title") and getattr(figure_layout.scene.title, "text", None):
                 axis.add_option("title", f"{{{sanitize_tex_text(figure_layout.scene.title.text)}}}")
 
-            data_name_macro, z_name = data_container.add_data3d(trace.x, trace.y, trace.z, trace.name)
+            data_name_macro = data_container.add_data3d(trace.x, trace.y, trace.z, trace.name)
             data_str.append(draw_scatter3d(data_name_macro, trace, colors_set))
 
             if trace.name and trace['showlegend'] is not False:
diff --git a/src/tikzplotly/_scatter.py b/src/tikzplotly/_scatter.py
index d766ea1..2c963eb 100644
--- a/src/tikzplotly/_scatter.py
+++ b/src/tikzplotly/_scatter.py
@@ -2,16 +2,16 @@
 Provides functionality to convert Plotly scatter traces into TikZ/PGFPlots code for LaTeX documents.
 """
 
-from warnings import warn
 import numpy as np
 from ._tex import tex_addplot, tex_add_text
 from ._color import convert_color
-from ._marker import marker_symbol_to_tex
 from ._dash import DASH_PATTERN
 from ._axis import Axis
 from ._data import data_type
+from ._trace_utils import configure_marker_options, finalize_marker_options
 from ._utils import px_to_pt, option_dict_to_str
 
+
 def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
     """Get code for a scatter trace.
 
@@ -54,16 +54,7 @@ def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
     mark_option_dict = {}
 
     if "markers" in mode:
-        if marker.symbol is not None:
-            symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
-            options_dict["mark"] = symbol
-            if "lines" not in mode:
-                options_dict["only marks"] = None
-            if symbol_options is not None:
-                mark_option_dict[symbol_options[0]] = symbol_options[1]
-        else:
-            if "lines" not in mode:
-                options_dict["only marks"] = None
+        configure_marker_options(mode, marker, options_dict, mark_option_dict, color_set)
 
         if scatter.marker.size is not None:
             options_dict["mark size"] = px_to_pt(marker.size)
@@ -73,14 +64,14 @@ def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
             mark_option_dict["solid"] = None
             mark_option_dict["fill"] = convert_color(scatter.marker.color)[0]
 
-        if (line:=scatter.marker.line) is not None:
+        if (line := scatter.marker.line) is not None:
             if line.color is not None:
                 color_set.add(convert_color(line.color)[:3])
                 mark_option_dict["draw"] = convert_color(line.color)[0]
             if line.width is not None:
                 mark_option_dict["line width"] = px_to_pt(line.width)
 
-        if (angle:=scatter.marker.angle) is not None:
+        if (angle := scatter.marker.angle) is not None:
             mark_option_dict["rotate"] = angle
 
         if (opacity := scatter.opacity) is not None:
@@ -88,15 +79,7 @@ def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
         if (opacity := scatter.marker.opacity) is not None:
             mark_option_dict["opacity"] = np.round(opacity, 2)
 
-        if mark_option_dict:
-            mark_options = option_dict_to_str(mark_option_dict)
-            options_dict["mark options"] = f"{{{mark_options}}}"
-
-    elif mode == "lines":
-        options_dict["mark"] = "none"
-
-    else:
-        warn(f"Scatter : Mode {mode} is not supported yet.")
+    finalize_marker_options(mode, options_dict, mark_option_dict, "Scatter")
 
     if scatter.line.width is not None:
         options_dict["line width"] = px_to_pt(scatter.line.width)
@@ -105,7 +88,6 @@ def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
     if scatter.connectgaps in [False, None] and None in scatter.x:
         options_dict["unbounded coords"] = "jump"
 
-
     if scatter.line.color is not None:
         options_dict["color"] = convert_color(scatter.line.color)[0]
         if "mark" in mode:
diff --git a/src/tikzplotly/_scatter3d.py b/src/tikzplotly/_scatter3d.py
index d338e64..a1ff2d4 100644
--- a/src/tikzplotly/_scatter3d.py
+++ b/src/tikzplotly/_scatter3d.py
@@ -1,12 +1,13 @@
 """
 Provides functionality to convert Plotly 3D scatter traces into TikZ/PGFPlots code for LaTeX documents.
 """
-from warnings import warn
+
 import numpy as np
 from ._color import convert_color
-from ._marker import marker_symbol_to_tex
+from ._trace_utils import configure_marker_options, finalize_marker_options
 from ._utils import px_to_pt, option_dict_to_str
 
+
 def draw_scatter3d(data_name, scatter, color_set):
     """
     Get code for a scatter3d trace.
@@ -29,16 +30,7 @@ def draw_scatter3d(data_name, scatter, color_set):
     mark_option_dict = {}
 
     if "markers" in mode:
-        if marker.symbol is not None:
-            symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
-            options_dict["mark"] = symbol
-            if "lines" not in mode:
-                options_dict["only marks"] = None
-            if symbol_options is not None:
-                mark_option_dict[symbol_options[0]] = symbol_options[1]
-        else:
-            if "lines" not in mode:
-                options_dict["only marks"] = None
+        configure_marker_options(mode, marker, options_dict, mark_option_dict, color_set)
 
         if marker.size is not None:
             size = marker.size
@@ -54,27 +46,12 @@ def draw_scatter3d(data_name, scatter, color_set):
             mark_option_dict["solid"] = None
             mark_option_dict["fill"] = convert_color(c)[0]
 
-        if (line := marker.line) is not None:
-            if line.color is not None:
-                color_set.add(convert_color(line.color)[:3])
-                mark_option_dict["draw"] = convert_color(line.color)[0]
-            if line.width is not None:
-                mark_option_dict["line width"] = px_to_pt(line.width)
-
         if (opacity := scatter.opacity) is not None:
             options_dict["opacity"] = opacity
         if (opacity := marker.opacity) is not None:
             mark_option_dict["opacity"] = opacity
 
-        if mark_option_dict:
-            mark_options = option_dict_to_str(mark_option_dict)
-            options_dict["mark options"] = f"{{{mark_options}}}"
-
-    elif mode == "lines":
-        options_dict["mark"] = "none"
-
-    else:
-        warn(f"Scatter3d : Mode {mode} is not supported yet.")
+    finalize_marker_options(mode, options_dict, mark_option_dict, "Scatter3d")
 
     if scatter.line is not None:
         if scatter.line.width is not None:
diff --git a/src/tikzplotly/_trace_utils.py b/src/tikzplotly/_trace_utils.py
new file mode 100644
index 0000000..4b32d17
--- /dev/null
+++ b/src/tikzplotly/_trace_utils.py
@@ -0,0 +1,44 @@
+"""Shared helpers for Plotly trace to TikZ conversion."""
+
+from warnings import warn
+
+from ._color import convert_color
+from ._marker import marker_symbol_to_tex
+from ._utils import px_to_pt, option_dict_to_str
+
+
+def configure_marker_options(mode, marker, options_dict, mark_option_dict, color_set):
+    """Populate common marker options for scatter-like traces."""
+
+    if marker.symbol is not None:
+        symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
+        options_dict["mark"] = symbol
+        if "lines" not in mode:
+            options_dict["only marks"] = None
+        if symbol_options is not None:
+            mark_option_dict[symbol_options[0]] = symbol_options[1]
+    elif "lines" not in mode:
+        options_dict["only marks"] = None
+
+    if marker.line is not None:
+        if marker.line.color is not None:
+            color = convert_color(marker.line.color)
+            color_set.add(color[:3])
+            mark_option_dict["draw"] = color[0]
+        if marker.line.width is not None:
+            mark_option_dict["line width"] = px_to_pt(marker.line.width)
+
+
+def finalize_marker_options(mode, options_dict, mark_option_dict, trace_name):
+    """Finalize common marker options for scatter-like traces."""
+
+    if "markers" in mode:
+        if mark_option_dict:
+            mark_options = option_dict_to_str(mark_option_dict)
+            options_dict["mark options"] = f"{{{mark_options}}}"
+        return
+
+    if mode == "lines":
+        options_dict["mark"] = "none"
+    else:
+        warn(f"{trace_name} : Mode {mode} is not supported yet.")
diff --git a/src/tikzplotly/_utils.py b/src/tikzplotly/_utils.py
index 29bdca4..d4ab6b5 100644
--- a/src/tikzplotly/_utils.py
+++ b/src/tikzplotly/_utils.py
@@ -93,18 +93,10 @@ def sanitize_char(ch: str, keep_space: int = 0) -> str:
     if ch == "@":
         return "at"
     if ch == " ":
-        if keep_space == 1:
-            return " "
-        if keep_space == 0:
-            return "_"
-        return ""
+        return " " if keep_space == 1 else "_" if keep_space == 0 else ""
     if ch in "[]{}= ":
         return f"x{ord(ch):x}"
-    # if not ascii, return hex
-    if ord(ch) > 127:
-        return f"x{ord(ch):x}"
-    # if not printable, return hex
-    if not ch.isprintable():
+    if ord(ch) > 127 or not ch.isprintable():   # not ascii or not printable: return hex
         return f"x{ord(ch):x}"
     return ch
 
diff --git a/tests/test_markers/test_markers_1_reference.tex b/tests/test_markers/test_markers_1_reference.tex
index 0569891..4080010 100644
--- a/tests/test_markers/test_markers_1_reference.tex
+++ b/tests/test_markers/test_markers_1_reference.tex
@@ -169,11 +169,11 @@
 xlabel=sepal\_width,
 ylabel=sepal\_length
 ]
-\addplot+ [mark=*, only marks, mark size=9, mark options={solid, fill=636efa, draw=darkslategrey, line width=1.5}] table[y=setosa] {\dataA};
+\addplot+ [mark=*, only marks, mark size=9, mark options={draw=darkslategrey, line width=1.5, solid, fill=636efa}] table[y=setosa] {\dataA};
 \addlegendentry{setosa}
-\addplot+ [mark=*, only marks, mark size=9, mark options={solid, fill=EF553B, draw=darkslategrey, line width=1.5}] table[y=versicolor] {\dataB};
+\addplot+ [mark=*, only marks, mark size=9, mark options={draw=darkslategrey, line width=1.5, solid, fill=EF553B}] table[y=versicolor] {\dataB};
 \addlegendentry{versicolor}
-\addplot+ [mark=*, only marks, mark size=9, mark options={solid, fill=00cc96, draw=darkslategrey, line width=1.5}] table[y=virginica] {\dataC};
+\addplot+ [mark=*, only marks, mark size=9, mark options={draw=darkslategrey, line width=1.5, solid, fill=00cc96}] table[y=virginica] {\dataC};
 \addlegendentry{virginica}
 \end{axis}
 \end{tikzpicture}
diff --git a/tests/test_markers/test_markers_2_reference.tex b/tests/test_markers/test_markers_2_reference.tex
index 60e4e4e..d7baf20 100644
--- a/tests/test_markers/test_markers_2_reference.tex
+++ b/tests/test_markers/test_markers_2_reference.tex
@@ -513,7 +513,7 @@
 \definecolor{mediumpurple}{RGB}{147, 112, 219}
 
 \begin{axis}
-\addplot+ [only marks, mark size=15, mark options={solid, fill=lightskyblue, draw=mediumpurple, line width=1.5, opacity=0.5}, forget plot] table[y=y0] {\dataA};
-\addplot+ [only marks, mark size=60, mark options={solid, fill=lightskyblue, draw=mediumpurple, line width=6, opacity=0.5}, forget plot] table[y=y0] {\dataB};
+\addplot+ [only marks, mark size=15, mark options={draw=mediumpurple, line width=1.5, solid, fill=lightskyblue, opacity=0.5}, forget plot] table[y=y0] {\dataA};
+\addplot+ [only marks, mark size=60, mark options={draw=mediumpurple, line width=6, solid, fill=lightskyblue, opacity=0.5}, forget plot] table[y=y0] {\dataB};
 \end{axis}
 \end{tikzpicture}
diff --git a/tests/test_markers/test_markers_3_reference.tex b/tests/test_markers/test_markers_3_reference.tex
index 9e869e9..b7c97a1 100644
--- a/tests/test_markers/test_markers_3_reference.tex
+++ b/tests/test_markers/test_markers_3_reference.tex
@@ -169,11 +169,11 @@
 xlabel=sepal\_width,
 ylabel=sepal\_length
 ]
-\addplot+ [mark=diamond*, only marks, mark size=6, mark options={solid, fill=636efa, draw=darkslategrey, line width=1.5}] table[y=setosa] {\dataA};
+\addplot+ [mark=diamond*, only marks, mark size=6, mark options={draw=darkslategrey, line width=1.5, solid, fill=636efa}] table[y=setosa] {\dataA};
 \addlegendentry{setosa}
-\addplot+ [mark=diamond*, only marks, mark size=6, mark options={solid, fill=EF553B, draw=darkslategrey, line width=1.5}] table[y=versicolor] {\dataB};
+\addplot+ [mark=diamond*, only marks, mark size=6, mark options={draw=darkslategrey, line width=1.5, solid, fill=EF553B}] table[y=versicolor] {\dataB};
 \addlegendentry{versicolor}
-\addplot+ [mark=diamond*, only marks, mark size=6, mark options={solid, fill=00cc96, draw=darkslategrey, line width=1.5}] table[y=virginica] {\dataC};
+\addplot+ [mark=diamond*, only marks, mark size=6, mark options={draw=darkslategrey, line width=1.5, solid, fill=00cc96}] table[y=virginica] {\dataC};
 \addlegendentry{virginica}
 \end{axis}
 \end{tikzpicture}
diff --git a/tests/test_markers/test_markers_angle_reference.tex b/tests/test_markers/test_markers_angle_reference.tex
index b06aee8..3d1900f 100644
--- a/tests/test_markers/test_markers_angle_reference.tex
+++ b/tests/test_markers/test_markers_angle_reference.tex
@@ -169,11 +169,11 @@
 xlabel=sepal\_width,
 ylabel=sepal\_length
 ]
-\addplot+ [mark=triangle*, only marks, mark size=9, mark options={xscale=0.5, solid, fill=636efa, draw=darkslategrey, line width=1.5, rotate=45}] table[y=setosa] {\dataA};
+\addplot+ [mark=triangle*, only marks, mark size=9, mark options={xscale=0.5, draw=darkslategrey, line width=1.5, solid, fill=636efa, rotate=45}] table[y=setosa] {\dataA};
 \addlegendentry{setosa}
-\addplot+ [mark=triangle*, only marks, mark size=9, mark options={xscale=0.5, solid, fill=EF553B, draw=darkslategrey, line width=1.5, rotate=45}] table[y=versicolor] {\dataB};
+\addplot+ [mark=triangle*, only marks, mark size=9, mark options={xscale=0.5, draw=darkslategrey, line width=1.5, solid, fill=EF553B, rotate=45}] table[y=versicolor] {\dataB};
 \addlegendentry{versicolor}
-\addplot+ [mark=triangle*, only marks, mark size=9, mark options={xscale=0.5, solid, fill=00cc96, draw=darkslategrey, line width=1.5, rotate=45}] table[y=virginica] {\dataC};
+\addplot+ [mark=triangle*, only marks, mark size=9, mark options={xscale=0.5, draw=darkslategrey, line width=1.5, solid, fill=00cc96, rotate=45}] table[y=virginica] {\dataC};
 \addlegendentry{virginica}
 \end{axis}
 \end{tikzpicture}
diff --git a/tox.ini b/tox.ini
index 73c5836..5845277 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,4 +7,4 @@ isolated_build = True
 deps = -rrequirements.txt
 commands =
     plotly_get_chrome -y
-    pytest {posargs}
\ No newline at end of file
+    pytest {posargs}

From 22448604aeb62cde0fe7b473fed3635333a5c802 Mon Sep 17 00:00:00 2001
From: Thomas Saigre <thomas.saigre-tardif@inria.fr>
Date: Sun, 12 Apr 2026 09:38:16 +0200
Subject: [PATCH 8/8] [fix] implement some fixes for #37

---
 docs/develop/contributing.md   |  2 +-
 pyproject.toml                 |  3 ++-
 src/tikzplotly/_scatter.py     |  7 ------
 src/tikzplotly/_trace_utils.py | 40 ++++++++++++++++++++++++++++------
 tests/test_specific.py         |  1 -
 tox.ini                        |  7 +++++-
 6 files changed, 42 insertions(+), 18 deletions(-)

diff --git a/docs/develop/contributing.md b/docs/develop/contributing.md
index fe96318..0a4998b 100644
--- a/docs/develop/contributing.md
+++ b/docs/develop/contributing.md
@@ -42,7 +42,7 @@ The code coverage is available in the directory `htmlcov`.
 
 !!! Tip "Note about coverage"
     The coverage CI is quite strict, so you need to cover all the modification to pass it.
-    I found that tedious at first, but actually making it pass make me realize that there were some bogs in the code!
+    I found that tedious at first, but actually making it pass make me realize that there were some bugs in the code!
 
 ??? Info "Pytest"
     Some warnings are ignored by `pytest`, as they are intended for the user in some specific cases, that are not relevant in general test cases.
diff --git a/pyproject.toml b/pyproject.toml
index 463c831..186a123 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,8 @@ keywords = ["plotly", "latex", "tikz", "figure", "conversion", "graphics"]
 dependencies = [
     "numpy",
     "plotly",
-    "pillow"
+    "pillow",
+    "kaleido"
 ]
 
 [project.optional-dependencies]
diff --git a/src/tikzplotly/_scatter.py b/src/tikzplotly/_scatter.py
index 2c963eb..eb06bf2 100644
--- a/src/tikzplotly/_scatter.py
+++ b/src/tikzplotly/_scatter.py
@@ -64,13 +64,6 @@ def draw_scatter2d(data_name, scatter, y_name, axis: Axis, color_set):
             mark_option_dict["solid"] = None
             mark_option_dict["fill"] = convert_color(scatter.marker.color)[0]
 
-        if (line := scatter.marker.line) is not None:
-            if line.color is not None:
-                color_set.add(convert_color(line.color)[:3])
-                mark_option_dict["draw"] = convert_color(line.color)[0]
-            if line.width is not None:
-                mark_option_dict["line width"] = px_to_pt(line.width)
-
         if (angle := scatter.marker.angle) is not None:
             mark_option_dict["rotate"] = angle
 
diff --git a/src/tikzplotly/_trace_utils.py b/src/tikzplotly/_trace_utils.py
index 4b32d17..b2f9b3f 100644
--- a/src/tikzplotly/_trace_utils.py
+++ b/src/tikzplotly/_trace_utils.py
@@ -8,7 +8,21 @@
 
 
 def configure_marker_options(mode, marker, options_dict, mark_option_dict, color_set):
-    """Populate common marker options for scatter-like traces."""
+    """Populate marker-related TikZ options for scatter-like traces.
+
+    Parameters
+    ----------
+    mode
+        Plotly trace mode string (for example ``markers`` or ``markers+lines``).
+    marker
+        Plotly marker object from the trace.
+    options_dict
+        Dictionary collecting top-level PGFPlots options.
+    mark_option_dict
+        Dictionary collecting nested ``mark options`` for PGFPlots.
+    color_set
+        Set used to track colors that must be defined in the LaTeX output.
+    """
 
     if marker.symbol is not None:
         symbol, symbol_options = marker_symbol_to_tex(marker.symbol)
@@ -20,17 +34,29 @@ def configure_marker_options(mode, marker, options_dict, mark_option_dict, color
     elif "lines" not in mode:
         options_dict["only marks"] = None
 
-    if marker.line is not None:
-        if marker.line.color is not None:
-            color = convert_color(marker.line.color)
+    if (line := marker.line) is not None:
+        if line.color is not None:
+            color = convert_color(line.color)
             color_set.add(color[:3])
             mark_option_dict["draw"] = color[0]
-        if marker.line.width is not None:
-            mark_option_dict["line width"] = px_to_pt(marker.line.width)
+        if line.width is not None:
+            mark_option_dict["line width"] = px_to_pt(line.width)
 
 
 def finalize_marker_options(mode, options_dict, mark_option_dict, trace_name):
-    """Finalize common marker options for scatter-like traces."""
+    """Finalize marker options and handle unsupported modes.
+
+    Parameters
+    ----------
+    mode
+        Plotly trace mode string.
+    options_dict
+        Dictionary collecting top-level PGFPlots options.
+    mark_option_dict
+        Dictionary collecting nested ``mark options`` for PGFPlots.
+    trace_name
+        Name used in warnings to identify the trace kind.
+    """
 
     if "markers" in mode:
         if mark_option_dict:
diff --git a/tests/test_specific.py b/tests/test_specific.py
index 56c302b..337dccb 100644
--- a/tests/test_specific.py
+++ b/tests/test_specific.py
@@ -34,7 +34,6 @@ def plot_sanitized_text():
 
 def plot_empty_figure():
     fig = go.Figure()
-    fig.show()
     return fig
 
 def plot_empty_histogram():
diff --git a/tox.ini b/tox.ini
index 5845277..3fba2c2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,12 @@ envlist =
 isolated_build = True
 
 [testenv]
-deps = -rrequirements.txt
+deps =
+    pandas
+    pytest
+    pytest-cov
+    pytest-codeblocks
+    pytest-randomly
 commands =
     plotly_get_chrome -y
     pytest {posargs}