Fixing unlinked traits in WCI due to invalid code_theme (Fix #53)

src/scwidgets/code/_widget_code_input.py

@@ -13,14 +13,16 @@ class CodeInput(WidgetCodeInput):
     Small wrapper around WidgetCodeInput that controls the output
     """
 
+    valid_code_themes = ["nord", "solarizedLight", "basicLight"]
+
     def __init__(
         self,
         function: Optional[types.FunctionType] = None,
         function_name: Optional[str] = None,
         function_parameters: Optional[str] = None,
         docstring: Optional[str] = None,
         function_body: Optional[str] = None,
-        code_theme: str = "default",
+        code_theme: str = "basicLight",
     ):
         if function is not None:
             function_name = (
@@ -46,6 +48,14 @@ def __init__(
             function_name, function_parameters, docstring, function_body, code_theme
         )
 
+        # this list is retrieved from
+        # https://github.com/osscar-org/widget-code-input/blob/eb10ca0baee65dd3bf62c9ec5d9cb2f152932ff5/js/widget.js#L249-L253
+        if code_theme not in CodeInput.valid_code_themes:
+            raise ValueError(
+                f"Given code_theme {code_theme!r} invalid. Please use one of "
+                f"the values {CodeInput.valid_code_themes}"
+            )
+
     @property
     def function(self) -> types.FunctionType:
         """

tests/notebooks/widget_scwidgets_code_input.py

@@ -0,0 +1,38 @@
+# ---
+# jupyter:
+#   jupytext:
+#     cell_metadata_filter: -all
+#     text_representation:
+#       extension: .py
+#       format_name: light
+#       format_version: '1.5'
+#       jupytext_version: 1.15.0
+#   kernelspec:
+#     display_name: Python 3 (ipykernel)
+#     language: python
+#     name: python3
+# ---
+
+# +
+import scwidgets
+from scwidgets.code import CodeInput
+
+# -
+
+scwidgets.get_css_style()
+
+# Test 1:
+# -------
+# Test if CodeInput traits are updading the widget view
+
+
+# +
+def foo():
+    return "init"
+
+
+ci = CodeInput(foo)
+ci
+# -
+
+ci.function_body = """return 'change'"""

tests/test_code.py

@@ -67,6 +67,12 @@ def test_get_code(self):
         ):
             CodeInput.get_code(lambda x: x)
 
+    def test_invalid_code_theme_raises_error(self):
+        with pytest.raises(
+            ValueError, match=r"Given code_theme 'invalid_theme' invalid.*"
+        ):
+            CodeInput(TestCodeInput.mock_function_1, code_theme="invalid_theme")
+
 
 def get_code_exercise(
     checks: List[Check],

tests/test_widgets.py

@@ -249,6 +249,23 @@ def test_privacy_policy(selenium_driver):
             ).click()
 
 
+def test_scwidgets_code_input(selenium_driver):
+    """
+    Tests the widget of the module code
+
+    :param selenium_driver: see conftest.py
+    """
+    driver = selenium_driver("tests/notebooks/widget_scwidgets_code_input.ipynb")
+
+    nb_cells = NotebookCellList(driver)
+    # Test 1:
+    # -------
+
+    # Tests if change in function_body changed the widget view
+    code_input_lines = nb_cells[2].find_elements(By.CLASS_NAME, CODE_MIRROR_CLASS_NAME)
+    assert "return 'change'" in code_input_lines[-1].text
+
+
 class TestExerciseWidgets:
     prefix = "pytest"