{"id":413,"date":"2024-01-29T10:57:31","date_gmt":"2024-01-29T10:57:31","guid":{"rendered":"https:\/\/learnpython.elegantwallp.com\/?p=413"},"modified":"2024-01-29T10:57:32","modified_gmt":"2024-01-29T10:57:32","slug":"python-unittest-assert-methods","status":"publish","type":"post","link":"https:\/\/learnpython.elegantwallp.com\/2024\/01\/29\/python-unittest-assert-methods\/","title":{"rendered":"Python Unittest Assert Methods"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you\u2019ll learn the overview of the Python unittest<\/code> assert methods to perform unit testing.<\/p>\n\n\n\n

Introduction to Python unittest assert methods<\/h2>\n\n\n\n

The\u00a0TestCase<\/code>\u00a0class of the\u00a0unittest\u00a0module provides you with a large number of assert methods to test. The following table shows the most commonly used assert methods:<\/p>\n\n\n\n

Method<\/th>Checks that<\/th><\/tr><\/thead>
assertEqual(x,\u00a0y, msg=None)<\/code><\/td>x == y<\/code><\/td><\/tr>
assertNotEqual(x,y,msg=None)<\/code><\/td>x != y<\/code><\/td><\/tr>
assertTrue(x, msg=None)<\/code><\/td>bool(x) is True<\/code><\/td><\/tr>
assertFalse(x, msg=None)<\/code><\/td>bool(x) is False<\/code><\/td><\/tr>
assertIs(x,\u00a0y , msg=None)<\/code><\/td>x is y<\/code><\/td><\/tr>
assertIsNot(x,\u00a0y, msg=None)<\/code><\/td>x is not <\/code>y<\/td><\/tr>
assertIsNone(x, msg=None)<\/code><\/td>x is None<\/code><\/td><\/tr>
assertIsNotNone(x , msg=None)<\/code><\/td>x is not None<\/code><\/td><\/tr>
assertIn(x,\u00a0y, msg=None)<\/code><\/td>x in <\/code>y<\/td><\/tr>
assertNotIn(x,\u00a0y, msg=None)<\/code><\/td>x not in <\/code>y<\/td><\/tr>
assertIsInstance(x,\u00a0y, msg=None)<\/code><\/td>isinstance(x, y)<\/code><\/td><\/tr>
assertNotIsInstance(x,\u00a0y, msg=None)<\/code><\/td>not isinstance(x, y)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

All of these methods have an optional msg<\/code> parameter whose type is a string. The msg<\/code> will be displayed in the test result if the test fails.<\/p>\n\n\n\n

The following assert methods check the exceptions, warnings, and log messages:<\/p>\n\n\n\n

Method<\/th>Checks that<\/th><\/tr><\/thead>
assertRaises(exc, fun, *args, **kwds)<\/code><\/td>fun(*args, **kwds)<\/code> raises exc<\/em><\/td><\/tr>
assertRaisesRegex(exc, r, fun, *args, **kwds)<\/code><\/td>fun(*args, **kwds)<\/code> raises exc<\/em> and the message matches regex r<\/em><\/td><\/tr>
assertWarns(warn, fun, *args, **kwds)<\/code><\/td>fun(*args, **kwds)<\/code> raises warn<\/em><\/td><\/tr>
assertWarnsRegex(warn, r, fun, *args, **kwds)<\/code><\/td>fun(*args, **kwds)<\/code> raises warn<\/em> and the message matches regex r<\/em><\/td><\/tr>
assertLogs(logger, level)<\/code><\/td>The with<\/code> block logs on logger<\/em> with a minimum level<\/em><\/td><\/tr>
assertNoLogs(logger, level)<\/code><\/td>The with<\/code> block does not log on logger<\/em> with a minimum level<\/em><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The following table shows the assert methods that perform more specific checks:<\/p>\n\n\n\n

Method<\/th>Checks that<\/th><\/tr><\/thead>
assertAlmostEqual(x,\u00a0y)<\/code><\/td>round(x-y, 7) == 0<\/code><\/td><\/tr>
assertNotAlmostEqual(x,\u00a0y)<\/code><\/td>round(x-y, 7) != 0<\/code><\/td><\/tr>
assertGreater(x, y)<\/code><\/td>x > y<\/code><\/td><\/tr>
assertGreaterEqual(x, y)<\/code><\/td>x >= y<\/code><\/td><\/tr>
assertLess(x, y)<\/code><\/td>x < <\/code>y<\/td><\/tr>
assertLessEqual(x, y)<\/code><\/td>x <= <\/code>y<\/td><\/tr>
assertRegex(s, r)<\/code><\/td>r.search(s)<\/code><\/td><\/tr>
assertNotRegex(s, r)<\/code><\/td>not r.search(s)<\/code><\/td><\/tr>
assertCountEqual(x, y)<\/code><\/td>x<\/em> and y<\/em> have the same number of elements in the same number.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

In the next tutorials, you\u2019ll learn about the unittest<\/code> assert methods in more detail and how to use them effectively.<\/p>\n","protected":false},"excerpt":{"rendered":"

Summary: in this tutorial, you\u2019ll learn the overview of the Python unittest assert methods to perform unit testing. Introduction to Python unittest assert methods The\u00a0TestCase\u00a0class of the\u00a0unittest\u00a0module provides you with a large number of assert methods to test. The following table shows the most commonly used assert methods: Method Checks that assertEqual(x,\u00a0y, msg=None) x == y assertNotEqual(x,y,msg=None) x != y assertTrue(x, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[],"class_list":["post-413","post","type-post","status-publish","format-standard","hentry","category-3-python-unit-testing"],"_links":{"self":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/comments?post=413"}],"version-history":[{"count":1,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/413\/revisions"}],"predecessor-version":[{"id":414,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/413\/revisions\/414"}],"wp:attachment":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/media?parent=413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/categories?post=413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/tags?post=413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}