add mock send mail

tests/test_finance.py

@@ -102,7 +102,8 @@ def test_create_bill(api_client, student_client, manager_client,
 
 
 @pytest.mark.django_db
-def test_confirm_pay_manager(manager_client, bill_cash, student):
+@mock.patch('django.core.mail.EmailMessage.send')
+def test_confirm_pay_manager(mocked_email, manager_client, bill_cash, student):
     assert Progress.objects.count() is 0
     assert ProgressLesson.objects.count() is 0
     data = {
@@ -132,3 +133,4 @@ def test_confirm_pay_manager(manager_client, bill_cash, student):
     progress = Progress.objects.filter(user=bill_cash.user).first()
     assert Progress.objects.filter(user=bill_cash.user).exists() is True
     assert ProgressLesson.objects.filter(progress=progress).exists() is True
+    assert mocked_email.call_count == 1