fix(email): complete HU-02 red-green TDD cycle

Author: mvallejosr

src/validators/email.py

@@ -55,7 +55,7 @@ def email(
         (Literal[True]): If `value` is a valid eMail.
         (ValidationError): If `value` is an invalid eMail.
     """
-    if not value or value.count("@") != 1:
+    if not value or "@" not in value:
         return False
 
     username_part, domain_part = value.rsplit("@", 1)

tests/test_email.py

@@ -45,7 +45,6 @@ def test_returns_true_on_valid_email(value: str):
         ("example@inv-.alid-.com",),
         ("example@inv-.-alid.com",),
         ("john56789.john56789.john56789.john56789.john56789.john56789.john5@example.com",),
-        ('"test@test"@example.com',),
         # Quoted-string format (CR not allowed)
         ('"\\\012"@here.com',),
         # Non-quoted space/semicolon not allowed

tests/test_email_quoted_at_sign.py

@@ -9,7 +9,8 @@
 @pytest.mark.parametrize(
     ("email",),
     [
-        ('"user@name"@example.com', ),
+        ('"user@name"@example.com',),
+        ('"test@test"@example.com',),
     ],
 )
 def test_email_accepts_at_sign_inside_quoted_local_part(email: str):