Python代码覆盖率工具coverage使用教程

2021-05-04 22:28

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标签：library 基于命令 src cmd addition 公众 line install

Python代码覆盖率工具coverage.py其实是一个第三方的包，同时支持Python2和Python3版本。
安装也非常简单，直接运行：

pip install coverage

首先我们编写一个简易计算器的程序：

# mymath.py
def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def multiply(a, b):
    return a * b

def divide(numerator, denominator):
    return float(numerator) / denominator

接着来编写基于unittest的单元测试用例：

# test_mymath.py
import mymath
import unittest

class TestAdd(unittest.TestCase):
    """
    Test the add function from the mymath library
    """
    def test_add_integers(self):
        """
        Test that the addition of two integers returns the correct total
        """
        result = mymath.add(1, 2)
        self.assertEqual(result, 3)

    def test_add_floats(self):
        """
        Test that the addition of two floats returns the correct result
        """
        result = mymath.add(10.5, 2)
        self.assertEqual(result, 12.5)

    def test_add_strings(self):
        """
        Test the addition of two strings returns the two string as one
        concatenated string
        """
        result = mymath.add(‘abc‘, ‘def‘)
        self.assertEqual(result, ‘abcdef‘)


if __name__ == ‘__main__‘:
    unittest.main()