Add tests

Signed-off-by: Kipchirchir Sigei <arapgodsmack@gmail.com>

onadata/apps/main/tests/test_user_validation.py

@@ -0,0 +1,27 @@
+from onadata.apps.main.admin import CustomUserChangeForm, CustomUserCreationForm
+from onadata.apps.main.tests.test_base import TestBase
+
+
+class TestUserValidation(TestBase):
+    def test_custom_user_creation_form_invalid_username(self):
+        # Try to create a user with a hyphenated username
+        form_data = {
+            "username": "john-doe",
+            "password1": "testpassword",
+            "password2": "testpassword",
+        }
+        form = CustomUserCreationForm(data=form_data)
+        self.assertFalse(form.is_valid())
+        self.assertIn("username", form.errors)
+        errors = form.errors.get("username")[0]
+        self.assertEqual(str(errors), "Usernames cannot contain hyphens.")
+
+    def test_custom_user_change_form_invalid_username(self):
+        # Try to change a user's username to one with a hyphen
+        user = self._create_user("bob-user", "bob")
+        form_data = {"username": "bob-user-1"}
+        form = CustomUserChangeForm(data=form_data, instance=user)
+        self.assertFalse(form.is_valid())
+        self.assertIn("username", form.errors)
+        errors = form.errors.get("username")[0]
+        self.assertEqual(str(errors), "Usernames cannot contain hyphens.")