Make TestReadingFunctions & TestWritingFunctions subclass of unittest.TestCase for better type suggestions. However, since this test case is meant to be abstract, we nest the class in an Abstract class to prevent test discovery of this class.
Add index_order typing for TestReadingFunctions and TestWritingFunctions
TestReadingFunctions&TestWritingFunctionssubclass ofunittest.TestCasefor better type suggestions. However, since this test case is meant to be abstract, we nest the class in anAbstractclass to prevent test discovery of this class.index_ordertyping forTestReadingFunctionsandTestWritingFunctions