35 minimal heatmap code raising an error

[thomas-saigre]

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• Have you written new tests for your changes? (either manual or automated one, cf the documentation)
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• close [Bugs] color not correctly handled #31
• close Minimal heatmap code raising an error #35
• close Handle warning detection in tests with pytest #36

[codecov]

Codecov Report

❌ Patch coverage is 97.14286% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/tikzplotly/_save.py	75.00%	1 Missing ⚠️
src/tikzplotly/_trace_utils.py	96.66%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/tikzplotly/_color.py	99.74% <100.00%> (+0.16%)	⬆️
src/tikzplotly/_data_container.py	96.93% <100.00%> (ø)
src/tikzplotly/_heatmap.py	95.00% <100.00%> (+0.06%)	⬆️
src/tikzplotly/_histogram.py	100.00% <100.00%> (ø)
src/tikzplotly/_polar.py	91.15% <100.00%> (ø)
src/tikzplotly/_scatter.py	88.70% <100.00%> (-0.83%)	⬇️
src/tikzplotly/_scatter3d.py	88.88% <100.00%> (+4.83%)	⬆️
src/tikzplotly/_utils.py	97.05% <100.00%> (+3.81%)	⬆️
src/tikzplotly/_save.py	94.07% <75.00%> (ø)
src/tikzplotly/_trace_utils.py	96.66% <96.66%> (ø)

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[Copilot]

Pull request overview

This PR addresses multiple open issues around heatmap export errors, color handling, and warning management in tests for tikzplotly, while also refactoring shared marker-option logic.

Changes:

• Fix heatmap image output directory creation when img_name has no dirname (e.g., default "heatmap.png").
• Improve/adjust color conversion behavior (notably rgba(...) parsing and unsupported color inputs) and add dedicated color tests.
• Standardize warning handling in pytest tests and refactor scatter/scatter3d marker option code into a shared utility.

Reviewed changes

Copilot reviewed 38 out of 41 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tox.ini	Switch tox deps to requirements.txt and add plotly_get_chrome step before pytest.
requirements.txt	Add pytest-related packages to shared requirements list.
pyproject.toml	Add pytest filterwarnings configuration.
.gitignore	Ignore MkDocs site/** output; minor formatting cleanup.
docs/develop/tests.md	Fix typo in documentation text.
docs/develop/contributing.md	Improve wording, update admonition type, document pytest warning ignores.
src/tikzplotly/_heatmap.py	Prevent os.makedirs('') by using '.' when dirname is empty.
src/tikzplotly/_color.py	Change unsupported color handling and enhance rgba(...) parsing (optional alpha).
src/tikzplotly/_utils.py	Simplify sanitize_char logic for spaces/non-ascii/non-printable chars.
src/tikzplotly/_trace_utils.py	New shared helper for scatter-like marker option assembly.
src/tikzplotly/_scatter.py	Use shared marker helper for 2D scatter marker options.
src/tikzplotly/_scatter3d.py	Use shared marker helper for 3D scatter marker options.
src/tikzplotly/_histogram.py	Factor histnorm handling into treat_histnorm() and add empty-histogram behavior.
src/tikzplotly/_data_container.py	Adjust add_data3d() return value (currently inconsistent between branches).
src/tikzplotly/_polar.py	Update DataContainer import path casing.
src/tikzplotly/_save.py	Update DataContainer import path casing; adjust 3D data add call and string sanitization.
tests/test_colors.py	New tests covering multiple color input formats and warning cases.
tests/test_colors/test_colors_transparent_background_reference.tex	New/updated reference for transparent background handling.
tests/test_colors/test_colors_rgba-with-opacity_reference.tex	New reference output for rgba color input.
tests/test_colors/test_colors_rgba-without-opacity_reference.tex	New reference output for rgba color input without alpha.
tests/test_colors/test_colors_rgb_reference.tex	New reference output for rgb color input.
tests/test_colors/test_colors_hex_reference.tex	New reference output for hex color input.
tests/test_colors/test_colors_named-color_reference.tex	New reference output for named color input.
tests/test_colors/test_colors_colors-dict-hit_reference.tex	New reference output for plotly named color-dict hit.
tests/test_colors/test_colors_numpy-array_reference.tex	New reference output for numpy-array color input (unsupported).
tests/test_colors/test_colors_non-string_reference.tex	New reference output for non-string color input (unsupported).
tests/test_colors/test_colors_none_reference.tex	New reference output for None color input.
tests/test_specific.py	Update tests to assert warnings; add empty-histogram test case.
tests/test_specific/test_specific_empty_histogram_reference.tex	New reference output for empty histogram case.
tests/test_scatter.py	Update tests to assert/conditionally expect warnings.
tests/test_scatter3d.py	Update tests to assert/conditionally expect warnings for unsupported color-from-data.
tests/test_scatter3d/test_scatter3d_2_markers_reference.tex	Update reference output reflecting marker option/color changes.
tests/test_scatter3d/test_scatter3d_2_markers+lines_reference.tex	Update reference output reflecting marker option/color changes.
tests/test_histograms.py	Update tests to assert/conditionally expect warnings around histnorm/histfunc.
tests/test_polar.py	Update test to expect warning for unsupported barpolar.
tests/test_markers.py	Update test to conditionally expect warning for unsupported dotted markers.
tests/test_markers/test_markers_1_reference.tex	Update reference output (marker option ordering/format).
tests/test_markers/test_markers_2_reference.tex	Update reference output (marker option ordering/format).
tests/test_markers/test_markers_3_reference.tex	Update reference output (marker option ordering/format).
tests/test_markers/test_markers_angle_reference.tex	Update reference output (marker option ordering/format).
tests/test_heatmap.py	Update tests to expect warnings and adjust date generation; rename empty-trace helper.

Comments suppressed due to low confidence (1)

src/tikzplotly/_data_container.py:189

• DataContainer.add_data3d() now returns a single value when creating new data (return data_obj.name) but still returns a 2-tuple in the cache-hit path (return data.name, data.z_name). This makes the return type inconsistent and can break callers (e.g., get_tikz_code() now assumes a string). Update the cache-hit branch to return the same type (and update the docstring accordingly).

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