Tests: modern PEP8-ify core test modules and methods (#2298)

* rename modules

* rename methods

* add docstrings to the general tests

* add base import stub

* test_base -> bases

* print deprecation warning

* redo 2346

test/general/test_names.py

@@ -0,0 +1,20 @@
+import unittest
+from worlds.AutoWorld import AutoWorldRegister
+
+
+class TestNames(unittest.TestCase):
+    def test_item_names_format(self):
+        """Item names must not be all numeric in order to differentiate between ID and name in !hint"""
+        for gamename, world_type in AutoWorldRegister.world_types.items():
+            with self.subTest(game=gamename):
+                for item_name in world_type.item_name_to_id:
+                    self.assertFalse(item_name.isnumeric(),
+                                     f"Item name \"{item_name}\" is invalid. It must not be numeric.")
+
+    def test_location_name_format(self):
+        """Location names must not be all numeric in order to differentiate between ID and name in !hint_location"""
+        for gamename, world_type in AutoWorldRegister.world_types.items():
+            with self.subTest(game=gamename):
+                for location_name in world_type.location_name_to_id:
+                    self.assertFalse(location_name.isnumeric(),
+                                     f"Location name \"{location_name}\" is invalid. It must not be numeric.")