Improved test coverage for Styler.bar error conditions

Author: ccccjone

pandas/tests/io/formats/style/test_bar.py

@@ -305,3 +305,23 @@ def test_bar_value_error_raises():
     msg = r"`height` must be a value in \[0, 100\]"
     with pytest.raises(ValueError, match=msg):
         df.style.bar(height=200).to_html()
+
+
+def test_bar_color_and_cmap_error_raises():
+    df = DataFrame({"A": [1, 2, 3, 4]})
+    msg = "`color` and `cmap` cannot both be given"
+    # Test that providing both color and cmap raises a ValueError
+    with pytest.raises(ValueError, match=msg):
+        df.style.bar(color='#d65f5f', cmap='viridis').to_html()
+
+
+def test_bar_invalid_color_type_error_raises():
+    df = DataFrame({"A": [1, 2, 3, 4]})
+    msg = r"`color` must be string or list or tuple of 2 strings,\(eg: color=\['#d65f5f', '#5fba7d'\]\)"
+    # Test that providing an invalid color type raises a ValueError
+    with pytest.raises(ValueError, match=msg):
+        df.style.bar(color=123).to_html()
+
+    # Test that providing a color list with more than two elements raises a ValueError
+    with pytest.raises(ValueError, match=msg):
+        df.style.bar(color=['#d65f5f', '#5fba7d', '#abcdef']).to_html()