Add tests for get_username_from_url function

tests/test_get_username_from_url.py

@@ -0,0 +1,62 @@
+import pytest
+import yaml
+import scraper
+from scraper import get_username_from_url
+
+
+@pytest.fixture
+def config_data():
+    with open("config.yml") as f:
+        config = yaml.load(f, Loader=yaml.SafeLoader)
+    return config
+
+def test_matched_host_urls(config_data):
+    # set global variable
+    scraper.config = config_data
+
+    # Linux Action News
+    assert get_username_from_url("/hosts/drewdvore") == "drew-devore"
+
+    # Coder
+    assert get_username_from_url("/hosts/chrislas") == "chris"
+    assert get_username_from_url("/hosts/wespayne") == "wes"
+
+    # Extras
+    assert get_username_from_url("/hosts/alexktz") == "alex"
+
+    # Office Hours
+    assert get_username_from_url("/hosts/brentgervais") == "brent"
+
+def test_unmatched_host_urls(config_data):
+    # set global variable
+    scraper.config = config_data
+
+    # Linux Action News
+    assert get_username_from_url("/hosts/chris") == "chris"
+    assert get_username_from_url("/hosts/joe") == "joe"
+    assert get_username_from_url("/hosts/wes") == "wes"
+
+    # Coder
+    assert get_username_from_url("/hosts/michael") == "michael"
+
+def test_matched_guests_urls(config_data):
+    # set global variable
+    scraper.config = config_data
+
+    # Selfhosted
+    assert get_username_from_url("/guests/alanpope") == "popey"
+
+    # Linux Unplugged
+    assert get_username_from_url("https://linuxunplugged.com/guests/martinwimpress") == "wimpy" 
+
+
+def test_unmatched_guests_urls(config_data):
+    # set global variable
+    scraper.config = config_data
+
+    # Selfhosted
+    assert get_username_from_url("https://selfhosted.show/guests/jscar") == "jscar"
+    assert get_username_from_url("https://selfhosted.show/guests/drewofdoom") == "drew-devore"
+
+    # Linux Unplugged
+    assert get_username_from_url("https://linuxunplugged.com/guests/christianschaller") == "christianschaller"