Test for checking unsupported data type

tests/gui/gui_specific/test_unsupported.py

@@ -0,0 +1,64 @@
+import pytest
+from taipy.gui import Gui
+
+
+def test_handle_invalid_data_no_callback(capfd):
+    gui = Gui()  # No callback set
+    result = gui.handle_invalid_data("invalid_data")
+
+    out, _ = capfd.readouterr()
+    assert result is None  # Should return None
+    assert "Unsupported data type encountered" in out  # Correct message logged
+
+
+def test_handle_invalid_data_callback_returns_none(capfd):
+    def callback(value):
+        return None  # Simulates a failed transformation
+
+    gui = Gui()
+    gui.on_invalid_data = callback  # Set the callback
+
+    result = gui.handle_invalid_data("invalid_data")
+    out, _ = capfd.readouterr()
+
+    assert result is None  # Transformation should result in None
+    assert out == ""  # No output expected
+
+
+def test_handle_invalid_data_callback_transforms_data():
+    def callback(value):
+        return "valid_data"  # Successful transformation
+
+    gui = Gui()
+    gui.on_invalid_data = callback  # Set the callback
+
+    result = gui.handle_invalid_data("invalid_data")
+    assert result == "valid_data"  # Data transformed correctly
+
+
+def test_handle_invalid_data_callback_raises_exception(capfd):
+    def callback(value):
+        raise ValueError("Transformation error")  # Simulate an error
+
+    gui = Gui()
+    gui.on_invalid_data = callback  # Set the callback
+
+    result = gui.handle_invalid_data("invalid_data")
+    out, _ = capfd.readouterr()
+
+    assert result is None  # Should return None on exception
+    assert (
+        "Error transforming data: Transformation error" in out
+    )  # Error message logged
+
+
+@pytest.mark.parametrize("input_data", [None, 123, [], {}, set()])
+def test_handle_invalid_data_with_various_inputs(input_data):
+    def callback(value):
+        return "valid_data"  # Always returns valid data
+
+    gui = Gui()
+    gui.on_invalid_data = callback  # Set the callback
+
+    result = gui.handle_invalid_data(input_data)
+    assert result == "valid_data"  # Transformed correctly for all inputs