I’m doing something like this def test_collection_size(create_fake_file): files = [create_fake_file] size = get_collection_size(files) assert size == 32 create_fake_file fixture should return a mock file of size 32 bytes I did something like this @pytest.fixture def fake_file_content(): # Returns 32 bytes of space return b" " * 32 @pytest.fixture def create_fake_file(fake_file_content): def _create_fake_file(file_path): # Use unittest.mock.mock_open… Read More how can I use fixture to create a mock file of certain size?

I am aware of pytest‘s decorators to mark tests as to be skipped (conditionally). However, all those are evaluated before the test starts. I have a couple of tests that require a user interaction (those are not run on CI obivously), and if that interaction is not provided, I would like to mark these tests… Read More Can I skip a test (or mark it as inconclusive) in pytest while it is running?

I am writing a test for a code that will raise an exception. with pytest.raises(Exception) as exception: A.b() assert str(exception.value) == "exception" The function b will never return a thing and may raise an exception. Once I put the return type of b() to def b() -> NoReturn: I am getting that the assertion will… Read More Pycharm provide unreachable code because of NoReturn type hint

I have a pytest.ini file that has the following contents [pytest] testpaths = tests/database/* tests/* addopts = -v –cov="merlot" –cov="merlot/sql" –cov-report term-missing My tests are structured such that tests | test1.py | test2.py | | subfolder | test3.py | test4.py | test5.py When I have testpaths = tests/* then no tests in subfolder are run,… Read More pytest running tests multiple times

I have some settings in a file, which read from my environment: File1.py set1 = os.getenv(…) SETTINGS = { key1: set1, … } In another File, I am importing them: File2.py from File1 import SETTINGS MyClass(): … In my tests file, I am mocking the MyClass methods, however, it is trying to access env vars,… Read More Avoid python module statements with pytest mocks

I am testing a class that contains a few methods for handling performance counters. It’s a normal Python class: class S3Db: data = {} fs = None s3_path = None def __init__(self, s3_api_key, s3_api_secret, bucket_name, filename, bucket_path=’/’): if s3_api_key != ‘test’: self.fs = s3fs.S3FileSystem(s3_api_key, secret=s3_api_secret) self.s3_path = f’s3://{bucket_name}{bucket_path}{filename}’ self.data = read_json_s3_path(self.fs, self.s3_path) pass def increment_timed_counter(self,… Read More Why an object instantiated in one Pytest impacts another instantiated in a different Pytest?

I have a project named unit_testing with 2 subfolders named src/ and tests/. In src there is a file called my_functions.py and in tests I have a file called test_my_functions.py. This is the code in my_functions.py def adding_pos(a, b, c): if a < 0 or b < 0 or c < 0: output = f’function… Read More Why does pytest return a ModuleNotFoundError when trying to import the src folder?

Using pytest, how can I parametrise a test function and then use the value both directly and indirectly? For example, take the very basic test below to check that a function to square a number returns the correct value. As far as I know, I have to parameterise the test function with the same set… Read More Use pytest.mark.parametrize both directly and indirectly

I am writing a method which takes path and file_name as arguments and looks for the specific file in the path (also in sub directories in path). In case the file is found, it is read properly. But if it is not there, I am unable to raise an exception. I have tried it like… Read More Exception not raised when file not found

I am trying to match the string in this error: for warning in args: if not isinstance(warning, str): with StaticvarExceptionHandler(): raise TypeError(f"Configure.suppress() only takes string arguments. Current type: {type(warning)}") with the one in this pytest test: with pytest.raises( TypeError, match = "Configure.suppress() only takes string arguments. Current type: .*" ): Configure.suppress(‘ComplicatedTypeWarning’, 1) It should match,… Read More "Regex pattern did not match", even though they should – pytest