private DropDownSelectionTextField<?> getDataTypeEditor(TableCellEditor cellEditor) {

		assertTrue(cellEditor instanceof ParameterDataTypeCellEditor);

		ParameterDataTypeCellEditor paramEditor = (ParameterDataTypeCellEditor) cellEditor;
		DataTypeSelectionEditor dtEditor = paramEditor.getEditor();
		return dtEditor.getDropDownTextField();
	}
Tests that an invalid parameter type entry will generate the proper error message
shown in the status box, and NOT present the user with a stack trace.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/function/editor/FunctionEditorDialogTest.java