参数化中的pytest依赖参数答案

【问题标题】：pytest dependent parameters in parametrize参数化中的pytest依赖参数
【发布时间】：2016-12-25 00:07:51
【问题描述】：

我希望一个参数化依赖于之前的一个：

@pytest.mark.parametrize("locale_name", LOCALES)
@pytest.mark.parametrize("money_string", ["500{currency}", "500 {currency}"])
@pytest.mark.parametrize("currency", LOCALES['locale_name']['currencies'])
def test_do_stuff(locale_name, money_string, currency):
    print(locale_name, money_string, currency)

这里，第三个参数化取决于第一个。

我尝试通过以下方式将其拆分：

@pytest.mark.parametrize("locale_name", LOCALES)
@pytest.mark.parametrize("money_string", ["500{currency}", "500 {currency}"])
def test_currencies(locale_name, money_string):
    # locale is actually also needed as an object, cannot be taken out. 
    locale = LOCALES[locale_name]

    @pytest.mark.parametrize("currency", locale['currencies'])
    def test_inner_currencies(currency):
        print("this does not run however")

但是内部代码没有运行。除了使用itertools.product 预先生成配对之外，我不确定对于这种情况我能做些什么（但这看起来很丑陋）？

请注意，我可以只有一个 for 循环，但我不会“正式”运行尽可能多的测试。

【问题讨论】：

标签： python dependencies pytest

【解决方案1】：

我不认为 py.test 支持测试 in 测试，如果我根据您的示例代码正确理解，您想要的只是测试货币，假设 LOCALES 是一个嵌套的 dict ，我会做这种事情解决测试

import pytest

LOCALES = {"US": {"currencies": "dollar"},
           "EU": {"currencies": "euro"},
           "IN": {"currencies": "rupees"},
           "CH": {"currencies": "yuan"}}

def currencies():
    return [(local_name, currency["currencies"]) for local_name, currency in
            LOCALES.items()]

@pytest.mark.parametrize("currency", currencies())
@pytest.mark.parametrize("money_string", ["500{currency}", "500 {currency}"])
def test_currencies(currency, money_string):
    locale_name, currency = currency
    print locale_name, money_string, currency

还有输出

============================= test session starts ==============================
platform darwin -- Python 2.7.10, pytest-2.9.2, py-1.4.31, pluggy-0.3.1
rootdir: /Users/sanjay/Library/Preferences/PyCharm2016.2/scratches, inifile: 
plugins: xdist-1.14
collected 8 items

scratch_11.py EU 500{currency} euro
.CH 500{currency} yuan
.US 500{currency} dollar
.IN 500{currency} rupees
.EU 500 {currency} euro
.CH 500 {currency} yuan
.US 500 {currency} dollar
.IN 500 {currency} rupees
.

=========================== 8 passed in 0.03 seconds ===========================

Process finished with exit code 0

【讨论】：