一. 安装coverage

直接执行命令

$ sudo easy_install coverage

二. 一个计算器项目的单测以及覆盖率生成的方式

$ mkdir src

$ mkdir test

$ vim src/Calc.py

class  Calc():

    def sum(self, a, b):

        c = a + b

        return c

    def minus(self, a, b):

        c = a - b

        return c

    def multi(self, a, b):

        c = a * b

        return c

    def div(self, a, b):

        c = None

        if 0 != b:

            c = a / b

        return c

    def  absolute(self, a, b):

        c = 0

        if a >= b:

            c = a - b

        else:

            c = b - a

        return c

$ vim test/TestCalc.py

import unittest

import sys

sys.path.append('./src')

import Calc

class TestCalc(unittest.TestCase):

    def setUp(self):

        self.calc = Calc.Calc()

    def test_sum(self):

        self.assertEqual(3, self.calc.sum(1, 2))

    def test_multi(self):

        self.assertEqual(6, self.calc.multi(2, 3))

    def test_absolute(self):

        self.assertEqual(8, self.calc.absolute(10, 2))

if __name__ == '__main__':

    unittest.main()

生成覆盖率统计数据

$ coverage run --branch --source=src/ test/TestCalc.py  #生成.coverage文件，可以使用命令$ coverage report在命令行上查看统计数据

$ coverage html -d covhtml #将.coverage转化为html统计信息

三. 效果展示