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//usr/local/lib/python3.9/test/test_importlib/abc.py

import abc

class FinderTests(metaclass=abc.ABCMeta):

"""Basic tests for a finder to pass."""

@abc.abstractmethod
    def test_module(self):
        # Test importing a top-level module.
        pass

@abc.abstractmethod
    def test_package(self):
        # Test importing a package.
        pass

@abc.abstractmethod
    def test_module_in_package(self):
        # Test importing a module contained within a package.
        # A value for 'path' should be used if for a meta_path finder.
        pass

@abc.abstractmethod
    def test_package_in_package(self):
        # Test importing a subpackage.
        # A value for 'path' should be used if for a meta_path finder.
        pass

@abc.abstractmethod
    def test_package_over_module(self):
        # Test that packages are chosen over modules.
        pass

@abc.abstractmethod
    def test_failure(self):
        # Test trying to find a module that cannot be handled.
        pass

class LoaderTests(metaclass=abc.ABCMeta):

@abc.abstractmethod
    def test_module(self):
        """A module should load without issue.

After the loader returns the module should be in sys.modules.

Attributes to verify:

* __file__
            * __loader__
            * __name__
            * No __path__

"""
        pass

@abc.abstractmethod
    def test_package(self):
        """Loading a package should work.

After the loader returns the module should be in sys.modules.

Attributes to verify:

* __name__
            * __file__
            * __package__
            * __path__
            * __loader__

"""
        pass

@abc.abstractmethod
    def test_lacking_parent(self):
        """A loader should not be dependent on it's parent package being
        imported."""
        pass

@abc.abstractmethod
    def test_state_after_failure(self):
        """If a module is already in sys.modules and a reload fails
        (e.g. a SyntaxError), the module should be in the state it was before
        the reload began."""
        pass

@abc.abstractmethod
    def test_unloadable(self):
        """Test ImportError is raised when the loader is asked to load a module
        it can't."""
        pass