moving migration integration tests

Author: dantownsend

…ps/migrations/auto/integration/README.md …ps/migrations/auto/integration/README.mdpiccolo/apps/migrations/auto/integration/README.md renamed to tests/apps/migrations/auto/integration/README.md piccolo/apps/migrations/auto/integration/README.md renamed to tests/apps/migrations/auto/integration/README.md

@@ -13,6 +13,7 @@
 )
 from piccolo.apps.migrations.commands.forwards import ForwardsMigrationManager
 from piccolo.table import Table, create_table_class
+from piccolo.apps.migrations.tables import Migration
 from piccolo.utils.sync import run_sync
 
 
@@ -21,13 +22,14 @@ def tearDown(self):
         create_table_class("MyTable").alter().drop_table(
             if_exists=True
         ).run_sync()
+        Migration.alter().drop_table(if_exists=True).run_sync()
 
     def run_migrations(self, app_config: AppConfig):
         manager = ForwardsMigrationManager(app_name=app_config.app_name)
         run_sync(manager.create_migration_table())
         run_sync(manager.run_migrations(app_config=app_config))
 
-    def _test_migrations(self, table_1: t.Type[Table], table_2: t.Type[Table]):
+    def _test_migrations(self, table_classes: t.List[t.Type[Table]]):
         temp_directory_path = tempfile.gettempdir()
         migrations_folder_path = os.path.join(
             temp_directory_path, "piccolo_migrations"
@@ -41,37 +43,28 @@ def _test_migrations(self, table_1: t.Type[Table], table_2: t.Type[Table]):
         app_config = AppConfig(
             app_name="test_app",
             migrations_folder_path=migrations_folder_path,
-            table_classes=[table_1],
+            table_classes=[],
         )
 
-        meta = run_sync(
-            _create_new_migration(app_config=app_config, auto=True)
-        )
-        self.assertTrue(os.path.exists(meta.migration_path))
-        self.run_migrations(app_config=app_config)
-
-        #######################################################################
-
-        # It's kind of absurd sleeping for 1 microsecond, but it guarantees
-        # the migration IDs will be unique, and just in case computers and / or
-        # Python get insanely fast in the future :)
-        time.sleep(1e-6)
+        for table_class in table_classes:
+            app_config.table_classes = [table_class]
+            meta = run_sync(
+                _create_new_migration(app_config=app_config, auto=True)
+            )
+            self.assertTrue(os.path.exists(meta.migration_path))
+            self.run_migrations(app_config=app_config)
 
-        #######################################################################
-
-        app_config.table_classes = [table_2]
-        meta = run_sync(
-            _create_new_migration(app_config=app_config, auto=True)
-        )
-        self.assertTrue(os.path.exists(meta.migration_path))
-        self.run_migrations(app_config=app_config)
+            # It's kind of absurd sleeping for 1 microsecond, but it guarantees
+            # the migration IDs will be unique, and just in case computers
+            # and / or Python get insanely fast in the future :)
+            time.sleep(1e-6)
 
-        # TODO - check the migrations ran correctly
+            # TODO - check the migrations ran correctly
 
     def test_add_column(self):
         table_1 = create_table_class("MyTable")
         table_2 = create_table_class(
             "MyTable", class_members={"name": Varchar()}
         )
 
-        self._test_migrations(table_1=table_1, table_2=table_2)
+        self._test_migrations(table_classes=[table_1, table_2])