Entry Point Testing

This module is designed to provide a strictly in-code implementation of MetaPathFinder that can be leveraged in unit testing in order to simulate an entry point being created, as would be loaded by importlib.metadata.entry_points() in Python 3.8+ or by importlib_metadata.entry_points() in earlier versions.

Requests for additional functionality aimed at testing plugin packages will be considered.

Usage

import unittest
import eptest


class Test(unittest.TestCase):

    def test_me(self):
        # Could move some of this to be a test fixture instead

        # Finder on sys.meta_path
        finder = eptest.TestFinder()

        # Add it to sys.meta_path
        finder.register()

        # Create a package
        package = eptest.TestPackage("foobar")

        # Create entry points
        package.add_entry_point(
            # Equivalent to a module with the following in setup.cfg:
            # [options.entry_points]
            # myep.group = 
            #     foobar = myep.tests:test.attr  
            eptest.TestEntryPoint("foobar", "myep.group", "myep.tests", "test.attr")
        )

        package.add_entry_point(
            # Equivalent to a module with the following in setup.cfg:
            # [options.entry_points]
            # myep.group = 
            #     foobar2 = myep.tests:test.attr[bar]  
            eptest.TestEntryPoint("foobar2", "myep.group", "myep.tests", "test.attr", ["bar"])
        )
        finder.add_package(package)

        # ... do tests

        # Call this to remove your foobar test package
        finder.remove_package(package)

        # Remove all packages
        finder.clear()

        # It is necessary to clean up sys.meta_path after your test case with this:
        finder.unregister()