Provides a command-line interface to the test script. The final block shows a simple way to run the tests. In theĮxample, setUp() was used to create a fresh sequence for each Likewise, if a tearDown() method isĭefined, the test runner will invoke that method after each test. When a setUp() method is defined, the test runner will run that Runner can accumulate all test results and produce a report. These methods are used instead of the assert statement so the test The crux of each test is a call to assertEqual() to check for anĮxpected result assertTrue() to verify a condition orĪssertRaises() to verify that an expected exception gets raised. This naming convention informs the test runner about which methods Individual tests are defined with methods whose names start with the letters main ()Ī testcase is created by subclassing unittest.TestCase. seq ) def test_sample ( self ): with self. shuffle, ( 1, 2, 3 )) def test_choice ( self ): element = random. seq, range ( 10 )) # should raise an exception for an immutable sequence self. seq = range ( 10 ) def test_shuffle ( self ): # make sure the shuffled sequence does not lose any elements random. Import random import unittest class TestSequenceFunctions ( unittest. Implemented for other environments (such as graphical environments) without any Test results on the standard error stream by default. Provides the TextTestRunner as an example test runner which reports TestResult is provided for use as the result object. Object as a parameter, and returns a result object. Run(), which accepts a TestCase or TestSuite Individual tests and test suites to be aggregated when the suite is executed,Īll tests added directly to the suite and in “child” test suites are run.Ī test runner is an object that provides a single method, Test suites are implemented by the TestSuite class. So a new fixture is created for each test. Instance of the TestCase will only be used to run a single test method, When the test is run, theįixture initialization is run first if it succeeds, the cleanup method is runĪfter the test has been executed, regardless of the outcome of the test. With FunctionTestCase, existing functionsĬan be passed to the constructor for these purposes. TearDown() methods can be overridden to provide initializationĪnd cleanup for the fixture. Used when creating new tests, and the latter can be used when integratingĮxisting test code with a unittest-driven framework. TestCase and FunctionTestCase classes the former should be The test case and test fixture concepts are supported through the The runner may use a graphical interface,Ī textual interface, or return a special value to indicate the results of test runner A test runner is a component which orchestrates the execution of testsĪnd provides the outcome to the user. Used to aggregate tests that should be executed together. test suite A test suite is a collection of test cases, test suites, or both. TestCase, which may be used to create new test cases. test case A test case is the smallest unit of testing. This may involve, for example,Ĭreating temporary or proxy databases, directories, or starting a server Tests, and any associate cleanup actions. To achieve this, unittest supports some important concepts: test fixture A test fixture represents the preparation needed to perform one or more It easy to support these qualities for a set of tests. The unittest module provides classes that make Tests, aggregation of tests into collections, and independence of the tests from Unittest supports test automation, sharing of setup and shutdown code for Each is the deįacto standard unit testing framework for its respective language. Turn, a Java version of Kent’s Smalltalk testing framework. Python language version of JUnit, by Kent Beck and Erich Gamma. The Python unit testing framework, sometimes referred to as “PyUnit,” is a We can pass a list to the side_effect attribute on our mocked object, and this will cause the mocked method to return each item in the list as it is called multiple times.(If you are already familiar with the basic concepts of testing, you might want Self.assertEqual(mock_post.call_count, 3) class MockResponse:ĭef _init_(self, status_code, text=''):Īnd our test will look like this: test_send_should_retry_until_successful(self, mock_post): To do this we'll need a MockResponse class. So let's simulate a scenario where the request fails twice before it succeeds. In this case, requests.post is called multiple times. Note: To do this in real life, you'll need to add alarms or other such mechanisms to ensure your script doesn't run forever. I want to test a function called add_numbers: from utils import Slack Note: This example will be used throughout this guide. In my case, I've got a function that initializes a class, and that class needs to be patched in its entirety. When writing unit tests in Python, you'll often want to patch an entire class.
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