Tests: implement pattern for filtering unittests locally (#5080)

test/worlds/__init__.py

@@ -1,17 +1,46 @@
-def load_tests(loader, standard_tests, pattern):
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from unittest import TestLoader, TestSuite
+
+
+def load_tests(loader: "TestLoader", standard_tests: "TestSuite", pattern: str):
     import os
     import unittest
+    import fnmatch
     from .. import file_path
     from worlds.AutoWorld import AutoWorldRegister
 
     suite = unittest.TestSuite()
     suite.addTests(standard_tests)
+
+    # pattern hack
+    # all tests from within __init__ are always imported, so we need to filter out the folder earlier
+    # if the pattern isn't matching a specific world, we don't have much of a solution
+
+    if pattern.startswith("worlds."):
+        if pattern.endswith(".py"):
+            pattern = pattern[:-3]
+        components = pattern.split(".")
+        world_glob = f"worlds.{components[1]}"
+        pattern = components[-1]
+
+    elif pattern.startswith(f"worlds{os.path.sep}") or pattern.startswith(f"worlds{os.path.altsep}"):
+        components = pattern.split(os.path.sep)
+        if len(components) == 1:
+            components = pattern.split(os.path.altsep)
+        world_glob = f"worlds.{components[1]}"
+        pattern = components[-1]
+    else:
+        world_glob = "*"
+
+
     folders = [os.path.join(os.path.split(world.__file__)[0], "test")
-               for world in AutoWorldRegister.world_types.values()]
+               for world in AutoWorldRegister.world_types.values()
+               if fnmatch.fnmatch(world.__module__, world_glob)]
 
     all_tests = [
         test_case for folder in folders if os.path.exists(folder)
-        for test_collection in loader.discover(folder, top_level_dir=file_path)
+        for test_collection in loader.discover(folder, top_level_dir=file_path, pattern=pattern)
         for test_suite in test_collection if isinstance(test_suite, unittest.suite.TestSuite)
         for test_case in test_suite
     ]