Is there a Pytest equivalent to the unittest unittest.TestLoader.loadTestsFromModule() method?

[SchoofsEbert]

I am working on a program that modifies test suites.
In the original implementation, there was only support for the unittest framework. I am trying to add support for Pytest now.

With the default unitest module, I could keep the modified tests as ASTs in memory, which I convert to a module, and finally, I can create a test suite from that, and run it.

#create module
code = test.AST.compile()
module = types.ModuleType(test.name)
module.__dict__.update(scope)
exec(code, module.__dict__)
#create suite
suite = unittest.TestLoader().loadTestsFromModule(module)
#run test
suite.run()

From everything that I can find in the Pytest documentation, this seems not possible.
Pytest needs the testfiles to function.

Does someone know if this is either possible for Pytest or a possible workaround? I don't want to write hundredths of modified tests to the filesystem, as this would be more expensive than keeping them in memory.

[nicoddemus]

One way I can think of now is to implement your own pytest_pycollect_makemodule hook, which would return a custom Module object. Here's the default implementation that can be used as basis:

pytest/src/_pytest/python.py

Lines 210 to 215 in 7720154

	def pytest_pycollect_makemodule(fspath: Path, parent) -> "Module":
	if fspath.name == "__init__.py":
	pkg: Package = Package.from_parent(parent, path=fspath)
	return pkg
	mod: Module = Module.from_parent(parent, path=fspath)
	return mod

[SchoofsEbert]

Thank you, this is indeed the direction to go. It will still be a lot of work to add support for multiple modules, and especially in the case of multiprocessing, but this is the way to go.