Unit testing two lists and if there is a difference, print/show it
我昨天开始用Python进行单元测试。 我在网上看到了一个用assertEqual测试的例子，他自动打印出两个列表之间的差异。 但是，似乎不会在我的脚本中发生。 我怎么能得到它？
下面的代码包含在从unittest.TestCase派生的类中：
1 2 3 4 5 6 7 8 9 10 11 | def test_compare_two_lists_should_fail(self): a = [1,2,3] # In my actual code this is generated by a module's function b = [1,2,4] self.assertListEqual(a, b, 'lists are inequal') def test_compare_two_lists_should_not_fail(self): a = [1,2,3] # In my actual code this is generated by a module's function b = [1,2,3] self.assertListEqual(a ,b, 'lists are inequal') |
运行此测试时，会产生以下输出：
test_compare_two_lists_should_not_fail(main.TestCase)......好的
test_compare_two_lists_should_fail(main.TestCase)......失败
======================================================================
失败：test_compare_two_lists_should_fail(main.TestCase)
Traceback(最近一次调用最后一次)：
test_compare_two_lists_should_fail中的文件"C：/some_dir/TestCase.py"，第34行
self.assertListEqual(a，b，'lists is inequal')
AssertionError：列表不等
在0.001s中进行2次测试
失败(失败= 1)
问题是您在两次调用
从这些文档
Args:
list1: The first list to compare.
list2: The second list to compare.
msg: Optional message to use on failure instead of a list of differences.
因此，如果您想查看列表之间的差异，请避免传递消息：
1 | self.assertListEqual(a ,b) |
顺便说一下，在两个测试中都有相同的
如果您从Python开始进行单元测试，我建议您使用
使用
1 2 | def testFoo(): assert [1, 2, 3] == [1, 2, 4], 'lists are inequal' |
结果是：
1 2 3 4 5 6 7 8 9 10 11 12 13 | ================================== FAILURES =================================== ___________________________________ testFoo ___________________________________ def testFoo(): > assert [1, 2, 3] == [1, 2, 4] E AssertionError: lists are inequal E assert [1, 2, 3] == [1, 2, 4] E At index 2 diff: 3 != 4 E Use -v to get the full diff File"foo.py", line 2 AssertionError ========================== 1 failed in 0.07 seconds =========================== |
写它很容易，而且很明显。 试试看！