Hamcrest 是一個為了測試為目的，能組成靈活表達式的匹配器類庫。用于編寫斷言的框架，提高可讀性以及開發效率。

安裝：
pip install pyhamcrest

導入：
from hamcrest import *

常用方法
equal_to(obj): 比較兩個對象

close_to(value, delta): 比較兩個值是否接近，范圍：[value-delta, value+delta]

contains_string(substring: str)：包含某個字符

assert_that("this is a string", equal_to("this is a string"))assert_that(1.0, close_to(0.5, 0.5))assert_that('abc', contains_string('a'))

參數化用例

import pytest from hamcrest import *@pytest.mark.parametrize("price, expect_price, delta", [(96.0, 100, 0.05), (101, 96, 0.1), (90, 100, 0.05) ]) def test_demo(price, expect_price, delta):print(price, ",", round(expect_price * delta, 2), ",", expect_price - expect_price * delta, ",",expect_price + expect_price * delta)assert_that(price, close_to(expect_price, round(expect_price * delta, 2)))

結果：

PASSED [ 33%]96.0 , 5.0 , 95.0 , 105.0 PASSED [ 66%]101 , 9.6 , 86.4 , 105.6 FAILED [100%]90 , 5.0 , 95.0 , 105.0demo_test.py:4 (test_demo[90-100-0.05]) price = 90, expect_price = 100, delta = 0.05@pytest.mark.parametrize("price, expect_price, delta", [(96.0, 100, 0.05), (101, 96, 0.1), (90, 100, 0.05)])def test_demo(price, expect_price, delta):print(price, ",", round(expect_price * delta, 2), ",", expect_price - expect_price * delta,",",expect_price + expect_price * delta) > assert_that(price, close_to(expect_price, round(expect_price * delta, 2))) E AssertionError: E Expected: a numeric value within <5.0> of <100> E but: <90> differed by <10.0>demo_test.py:11: AssertionErrorAssertion failed

總結

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