PythonフラスコModuleNotFoundError：「app」という名前のモジュールがありません

Python Flask Modulenotfounderror

ユーザーモデルの単体テスト時にエラーが報告されます

コードは次のとおりです、それを解決する方法

from datetime import datetime,timedelta import unittest from app import app,db from app.models import User,Post class UserModelCase(unittest.TestCase): def setUp(self): app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite://' db.create_all() def tearDown(self): db.session.remove() db.drop_all() def test_password_hashing(self): u = User(username='susan') u.set_password('cat') self.assertFalse(u.check_password('dog')) self.assertTrue(u.check_password('cat')) def test_avatar(self): u = User(username='john', email='root@xxxxx') self.assertEqual(u.avatar(128),('https://www.gravatar.com/avatar/' 'd4c74594d841139328695756648b6bd6' '?d=identicon&s=128')) def test_follow(self): u1 = User(username='john', email='root@xxxxx') u2 = User(username='susan',email='root@xxxxx') db.session.add(u1) db.session.add(u2) db.session.commit() self.assertEqual(u1.followed.all(),[]) self.assertEqual(u1,followers.all(),[]) u1.follow(u2) db.session.commit() self.assertTrue(u1.is_following(u2)) self.assertEqual(u1.followed.count(),1) self.assertEqual(u1.followed.first().username,'susan') self.assertEqual(u2.followers.count(),1) self.assertEqual(u2.followers.first().username,'john') u1.unfollow(u2) db.session.commit() self.assertFalse(u1.is_following(u2)) self.assertEqual(u1.followed.count(), 0) self.assertEqual(u2.followers.count(), 0) def test_follow_posts(self): # create four users u1 = User(username='john', email='root@xxxxx') u2 = User(username='susan', email='root@xxxxx') u3 = User(username='mary', email='root@xxxxx') u4 = User(username='david', email='root@xxxxx') db.session.add_all([u1, u2, u3, u4]) # create four posts now = datetime.utcnow() p1 = Post(body='post from john', author=u1, timestamp=now + timedelta(seconds=1)) p2 = Post(body='post from susan', author=u2, timestamp=now + timedelta(seconds=4)) p3 = Post(body='post from mary', author=u3, timestamp=now + timedelta(seconds=3)) p4 = Post(body='post from david', author=u4, timestamp=now + timedelta(seconds=2)) db.session.add_all([p1, p2, p3, p4]) db.session.commit() # setup the followers u1.follow(u2) # john follows susan u1.follow(u4) # john follows david u2.follow(u3) # susan follows mary u3.follow(u4) # mary follows david db.session.commit() # check the followed posts of each user f1 = u1.followed_posts().all() f2 = u2.followed_posts().all() f3 = u3.followed_posts().all() f4 = u4.followed_posts().all() self.assertEqual(f1, [p2, p4, p1]) self.assertEqual(f2, [p2, p3]) self.assertEqual(f3, [p3, p4]) self.assertEqual(f4, [p4]) if __name__ == '__main__': unittest.main(verbosity=2)