Tests: now autoload tests from /worlds/*/test (#1318)

Co-authored-by: black-sliver <59490463+black-sliver@users.noreply.github.com>

test/worlds/__init__.py

@@ -0,0 +1,14 @@
+def load_tests(loader, standard_tests, pattern):
+    import os
+    import unittest
+    from ..TestBase import file_path
+    from worlds.AutoWorld import AutoWorldRegister
+
+    suite = unittest.TestSuite()
+    suite.addTests(standard_tests)
+    folders = [os.path.join(os.path.split(world.__file__)[0], "test")
+               for world in AutoWorldRegister.world_types.values()]
+    for folder in folders:
+        if os.path.exists(folder):
+            suite.addTests(loader.discover(folder, top_level_dir=file_path))
+    return suite