在 py.test 中是否可以报告测试运行中生成的任意值?

In py.test is it possible to report arbitrary values generated in the test runs?

我知道有用于 py.test 的性能测试和分析的插件,但是有没有办法生成任意值,这些值在测试后报告或以某种方式访问​​?

想象一下我有这样的测试

def test_minimum_learning_rate():
    """Make some fancy stuff and generate a learning performance value"""
    learning_rate = fancy_learning_function().rate
    pytest.report("rate", learning_rate)
    assert learning_rate > 0.5

pytest.report(..) 行是我 喜欢 拥有的(但不存在,是吗?)

现在我想将 minimum_learning_rate[rate] 之类的内容与实际测试结果一起写入报告(或者至少在屏幕上)。

真的 Jenkins 的一些插件很不错,它可以根据该数据创建一个漂亮的图表。

有没有典型的措辞?我一直在寻找 kpiarbitrary valuesuser defined values,但还没有任何运气..

如果您只想输出一些调试值,print 调用结合 -s 参数就足够了:

def test_spam():
    print('debug')
    assert True

运行 pytest -s:

collected 1 item                                                                                                                                                                                                  

test_spam.py debug
.

如果您正在寻找可以更好地集成到 pytest 执行流程中的解决方案,请编写自定义挂钩。下面的例子应该会给你一些想法。

每次测试执行后打印自定义行

# conftest.py

def pytest_report_teststatus(report, config):
    if report.when == 'teardown':  # you may e.g. also check the outcome here to filter passed or failed tests only
        rate = getattr(config, '_rate', None)
        if rate is not None:
            terminalreporter = config.pluginmanager.get_plugin('terminalreporter')
            terminalreporter.ensure_newline()
            terminalreporter.write_line(f'test {report.nodeid}, rate: {rate}', red=True, bold=True)

测试:

def report(rate, request):
    request.config._rate = rate

def test_spam(request):
    report(123, request)

def test_eggs(request):
    report(456, request)

输出:

collected 2 items                                                                                                                                                                                                 

test_spam.py .
test test_spam.py::test_spam, rate: 123

test_spam.py .
test test_spam.py::test_eggs, rate: 456
===================================================== 2 passed in 0.01 seconds =====================================================

测试执行后收集数据并打印

# conftest.py

def pytest_configure(config):
    config._rates = dict()

def pytest_terminal_summary(terminalreporter, exitstatus, config):
    terminalreporter.ensure_newline()
    for testid, rate in config._rates.items():
        terminalreporter.write_line(f'test {testid}, rate: {rate}', yellow=True, bold=True)

测试:

def report(rate, request):
    request.config._rates[request.node.nodeid] = rate

def test_spam(request):
    report(123, request)

def test_eggs(request):
    report(456, request)

输出:

collected 2 items                                                                                                                  

test_spam.py ..

test test_spam.py::test_spam, rate: 123
test test_spam.py::test_eggs, rate: 456
===================================================== 2 passed in 0.01 seconds =====================================================

在 JUnit 中附加数据 XML 报告

使用 record_property 夹具:

def test_spam(record_property):
    record_property('rate', 123)

def test_eggs(record_property):
    record_property('rate', 456)

结果报告:

$ pytest --junit-xml=report.xml
...
$ xmllint --format report.xml
<testsuite errors="0" failures="0" name="pytest" skipped="0" tests="2" time="0.056">
  <testcase classname="test_spam" file="test_spam.py" line="12" name="test_spam" time="0.001">
    <properties>
      <property name="rate" value="123"/>
    </properties>
  </testcase>
  <testcase classname="test_spam" file="test_spam.py" line="15" name="test_eggs" time="0.001">
    <properties>
      <property name="rate" value="456"/>
    </properties>
  </testcase>
</testsuite>