style: fix black formatting for wave72 generated video tests

tests/unit/test_generated_video_verification_code.py

@@ -213,6 +213,7 @@ class TestVerificationCodeCreate:
     def test_expiry_time_correct(self):
         """过期时间正确（5分钟后）."""
         from datetime import datetime, timezone
+
         before = datetime.now(timezone.utc) + timedelta(seconds=299)
         vc = VerificationCode.create(
             recipient="u@test.com",
@@ -230,6 +231,7 @@ class TestVerificationCodeCreate:
             ttl_seconds=60,
         )
         from datetime import datetime, timezone
+
         now = datetime.now(timezone.utc)
         # 应该在1分钟左右过期
         diff = (vc.expires_at - now).total_seconds()
@@ -242,17 +244,22 @@ class TestVerificationCodeProperties:
     def test_is_expired_false_for_new(self):
         """新创建的验证码未过期."""
         vc = VerificationCode.create(
-            recipient="u@test.com", code_type="email_bind", ttl_seconds=300,
+            recipient="u@test.com",
+            code_type="email_bind",
+            ttl_seconds=300,
         )
         assert vc.is_expired is False
 
     def test_is_expired_true_when_past(self):
         """已过期的验证码is_expired=True."""
         vc = VerificationCode.create(
-            recipient="u@test.com", code_type="email_bind", ttl_seconds=1,
+            recipient="u@test.com",
+            code_type="email_bind",
+            ttl_seconds=1,
         )
         # 手动改过期时间到过去
         from datetime import datetime, timezone, timedelta
+
         vc.expires_at = datetime.now(timezone.utc) - timedelta(seconds=1)
         assert vc.is_expired is True
 
@@ -270,6 +277,7 @@ class TestVerificationCodeProperties:
         """过期的验证码无效."""
         vc = VerificationCode.create(recipient="u@test.com", code_type="email_bind", ttl_seconds=1)
         from datetime import datetime, timezone, timedelta
+
         vc.expires_at = datetime.now(timezone.utc) - timedelta(seconds=1)
         assert vc.is_valid is False