Python unittest – assertTrue()函数

Python中的 assertTrue() 是一个 unittest 库函数，用于在单元测试中将测试值与 true 进行比较。该函数将两个参数作为输入，并根据断言条件返回一个布尔值。如果测试值为真，则 assertTrue() 将返回真，否则返回假。

Syntax: assertTrue(testValue, message)
 

Parameters: assertTrue() accepts two parameters which are listed below with explanation:

• testValue:  variable of boolean type which is used in the comparison by function
• message: a string sentence as a message which got displayed when the test case got failed.

下面列出了两个不同的示例，说明了给定断言函数的正负测试用例：

示例 1：否定测试用例

Python3

# unit test case
import unittest
 
class TestStringMethods(unittest.TestCase):
    # test function
    def test_negative(self):
        testValue = False
        # error message in case if test case got failed
        message = "Test value is not true."
        # assertTrue() to check true of test value
        self.assertTrue( testValue, message)
 
if __name__ == '__main__':
    unittest.main()

输出：

F
======================================================================
FAIL: test_negative (__main__.TestStringMethods)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "p1.py", line 11, in test_negative
    self.assertTrue( testValue, message)
AssertionError: False is not true : Test value is not true.

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (failures=1)

示例 2：正面测试用例

Python3

# unit test case
import unittest
 
class TestStringMethods(unittest.TestCase):
    # test function
    def test_positive(self):
        testValue = True
        # error message in case if test case got failed
        message = "Test value is not true."
        # assertTrue() to check true of test value
        self.assertTrue( testValue, message)
 
if __name__ == '__main__':
    unittest.main()

输出：

.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK

参考：https://docs。 Python.org/3/library/unittest.html