Pytest 在测试用例以外的类中获取测试信息

Question

I am writing a test framework using pytest. Is there a way to get testcase object in classes other than testcase. For example utility classes.

I want to print the testcase name and some markers for the test in utility classes. Are these information available in some contextmanager?

Answer 1

You cannot directly access pytest test properties if you are not inside a test fixture or a hook function, as there is no fixed test case class as in unittest . Your best bet is probably to get this information in a fixture and store it globally for access from a utility function:

testinfo={} 

@pytest.fixture(autouse=True)
def test_info(request):
    global testinfo
    testinfo['name'] = request.node.name
    testinfo['markers'] = [m.name for m in request.node.iter_markers()]
    ...
    yield  # the information is stored at test start... 
    testinfo = {}  # ... and removed on test teardown 

def utility_func():
    if testinfo:
        print(f"Name: {testinfo['name']} Markers: {testinfo['markers']}")
   ... 

Or, the same if you use a test class:

class TestSomething:
    def setup_method(self):
        self.testinfo = {}

    @pytest.fixture(autouse=True)
    def info(self, request):
        self.testinfo['name'] = request.node.name
        self.testinfo['markers'] = [m.name for m in
                                    request.node.iter_markers()]
        yield  # the information is stored at test start...
        self.testinfo = {}  # ... and removed on test teardown

    def utility_func(self):
        if self.testinfo:
            print(f"Name: {self.testinfo['name']} Markers:"
                  f" {self.testinfo['markers']}")

    @pytest.mark.test_marker
    def test_something(self):
        self.utility_func()
        assert True

This will show the output:

Name: test_something Markers: ['test_marker']

This will work if you call the utility function during test execution - otherwise no value will be set.

Note however that this will only work reliably if you execute the test synchronously. If using pytest-xdist or similar tools for asynchronous test execution, this may not work due to the testinfo variable being overwitten by another test (though that depends on the implementation - it may work, if the variables are copied during a test run). In that case you can to do the logging directly in the fixture or hook function (which may generally be a better idea, depending on your use case).

For more information about available test node properties you can check the documentation of a request node .