debuggingtestingand profiling if we want to run the test_atomic py module from another test program we can write program that is similar to the one we used to execute doctests using the unittest module for exampleimport unittest import test_atomic suite unittest testloader(loadtestsfromtestcasetest_atomic testatomicrunner unittest texttestrunner(print(runner run(suite)herewe have created single suite by telling the unittest module to read the test_atomic module and to use each of its test*(methods (test_list_success(and test_list_fail(in this exampleas we will see in moment)as test cases we will now review the implementation of the testatomic class unusually for subclasses generallyalthough not for unittest testcase subclassesthere is no need to implement the initializer in this case we will need setup methodbut not teardown method and we will implement two test cases def setup(self)self original_list list(range( )we have used the unittest testcase setup(method to create single piece of test data def test_list_succeed(self)items self original_list[:with atomic atomic(itemsas atomicatomic append( atomic insert( - del atomic[ atomic[ - atomic insert( - self assertequal(items[- - - ]this test case is used to test that all of set of changes to list are correctly applied the test performs an appendan insertion in the middlean insertion at the beginninga deletionand change of value while by no means comprehensivethe test does at least cover the basics the test should not raise an exceptionbut if it does the unittest testcase base class will handle it by turning it into an appropriate error message at the end we expect the items list to equal the literal list included in the test rather than the original list the unittest testcase assertequal(method can