diff --git a/conftest.py b/conftest.py
index 4eee9e1..89639b2 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,5 +1,6 @@
 import asyncio
 import os
+from typing import Generator
 
 import pytest
 from tortoise import Tortoise, expand_db_url, generate_schema_for_client
@@ -12,8 +13,9 @@
 from aerich.ddl.sqlite import SqliteDDL
 from aerich.migrate import Migrate
 
-db_url = os.getenv("TEST_DB", "sqlite://:memory:")
-db_url_second = os.getenv("TEST_DB_SECOND", "sqlite://:memory:")
+MEMORY_SQLITE = "sqlite://:memory:"
+db_url = os.getenv("TEST_DB", MEMORY_SQLITE)
+db_url_second = os.getenv("TEST_DB_SECOND", MEMORY_SQLITE)
 tortoise_orm = {
     "connections": {
         "default": expand_db_url(db_url, True),
@@ -27,7 +29,7 @@
 
 
 @pytest.fixture(scope="function", autouse=True)
-def reset_migrate():
+def reset_migrate() -> None:
     Migrate.upgrade_operators = []
     Migrate.downgrade_operators = []
     Migrate._upgrade_fk_m2m_index_operators = []
@@ -37,20 +39,20 @@ def reset_migrate():
 
 
 @pytest.fixture(scope="session")
-def event_loop():
+def event_loop() -> Generator:
     policy = asyncio.get_event_loop_policy()
     res = policy.new_event_loop()
     asyncio.set_event_loop(res)
-    res._close = res.close
-    res.close = lambda: None
+    res._close = res.close  # type:ignore[attr-defined]
+    res.close = lambda: None  # type:ignore[method-assign]
 
     yield res
 
-    res._close()
+    res._close()  # type:ignore[attr-defined]
 
 
 @pytest.fixture(scope="session", autouse=True)
-async def initialize_tests(event_loop, request):
+async def initialize_tests(event_loop, request) -> None:
     await Tortoise.init(config=tortoise_orm, _create_db=True)
     await generate_schema_for_client(Tortoise.get_connection("default"), safe=True)
 
diff --git a/tests/models.py b/tests/models.py
index 5dd7f61..5f8ae87 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -37,7 +37,7 @@ class Email(Model):
     email = fields.CharField(max_length=200, index=True)
     is_primary = fields.BooleanField(default=False)
     address = fields.CharField(max_length=200)
-    users = fields.ManyToManyField("models.User")
+    users: fields.ManyToManyRelation[User] = fields.ManyToManyField("models.User")
 
 
 def default_name():
@@ -47,13 +47,15 @@ def default_name():
 class Category(Model):
     slug = fields.CharField(max_length=100)
     name = fields.CharField(max_length=200, null=True, default=default_name)
-    user = fields.ForeignKeyField("models.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", description="User"
+    )
     title = fields.CharField(max_length=20, unique=False)
     created_at = fields.DatetimeField(auto_now_add=True)
 
 
 class Product(Model):
-    categories = fields.ManyToManyField("models.Category")
+    categories: fields.ManyToManyRelation[Category] = fields.ManyToManyField("models.Category")
     name = fields.CharField(max_length=50)
     view_num = fields.IntField(description="View Num", default=0)
     sort = fields.IntField()
@@ -75,7 +77,9 @@ class Config(Model):
     key = fields.CharField(max_length=20)
     value = fields.JSONField()
     status: Status = fields.IntEnumField(Status)
-    user = fields.ForeignKeyField("models.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", description="User"
+    )
 
 
 class NewModel(Model):
diff --git a/tests/models_second.py b/tests/models_second.py
index 505aa27..71f108f 100644
--- a/tests/models_second.py
+++ b/tests/models_second.py
@@ -34,18 +34,24 @@ class User(Model):
 class Email(Model):
     email = fields.CharField(max_length=200)
     is_primary = fields.BooleanField(default=False)
-    user = fields.ForeignKeyField("models_second.User", db_constraint=False)
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models_second.User", db_constraint=False
+    )
 
 
 class Category(Model):
     slug = fields.CharField(max_length=200)
     name = fields.CharField(max_length=200)
-    user = fields.ForeignKeyField("models_second.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models_second.User", description="User"
+    )
     created_at = fields.DatetimeField(auto_now_add=True)
 
 
 class Product(Model):
-    categories = fields.ManyToManyField("models_second.Category")
+    categories: fields.ManyToManyRelation[Category] = fields.ManyToManyField(
+        "models_second.Category"
+    )
     name = fields.CharField(max_length=50)
     view_num = fields.IntField(description="View Num")
     sort = fields.IntField()
diff --git a/tests/old_models.py b/tests/old_models.py
index b8ffc5d..e882bc8 100644
--- a/tests/old_models.py
+++ b/tests/old_models.py
@@ -35,18 +35,22 @@ class User(Model):
 class Email(Model):
     email = fields.CharField(max_length=200)
     is_primary = fields.BooleanField(default=False)
-    user = fields.ForeignKeyField("models.User", db_constraint=False)
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", db_constraint=False
+    )
 
 
 class Category(Model):
     slug = fields.CharField(max_length=200)
     name = fields.CharField(max_length=200)
-    user = fields.ForeignKeyField("models.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", description="User"
+    )
     created_at = fields.DatetimeField(auto_now_add=True)
 
 
 class Product(Model):
-    categories = fields.ManyToManyField("models.Category")
+    categories: fields.ManyToManyRelation[Category] = fields.ManyToManyField("models.Category")
     name = fields.CharField(max_length=50)
     view_num = fields.IntField(description="View Num")
     sort = fields.IntField()
diff --git a/tests/test_migrate.py b/tests/test_migrate.py
index a99a143..4614606 100644
--- a/tests/test_migrate.py
+++ b/tests/test_migrate.py
@@ -1,4 +1,3 @@
-import tempfile
 from pathlib import Path
 
 import pytest
@@ -1010,14 +1009,13 @@ def test_sort_all_version_files(mocker):
     ]
 
 
-async def test_empty_migration(mocker) -> None:
+async def test_empty_migration(mocker, tmp_path: Path) -> None:
     mocker.patch("os.listdir", return_value=[])
     Migrate.app = "foo"
     expected_content = MIGRATE_TEMPLATE.format(upgrade_sql="", downgrade_sql="")
-    with tempfile.TemporaryDirectory() as temp_dir:
-        Migrate.migrate_location = temp_dir
+    Migrate.migrate_location = tmp_path
 
-        migration_file = await Migrate.migrate("update", True)
+    migration_file = await Migrate.migrate("update", True)
 
-        with open(Path(temp_dir, migration_file), "r") as f:
-            assert f.read() == expected_content
+    f = tmp_path / migration_file
+    assert f.read_text() == expected_content