Pass admin URL to API when resetting password

This follows the pattern for invite emails where the admin app tells the
API which domain to use when generating the link.

app/notify_client/user_api_client.py

@@ -176,7 +176,10 @@ class UserApiClient(NotifyAdminAPIClient):
 
     def send_reset_password_url(self, email_address, next_string=None):
         endpoint = '/user/reset-password'
-        data = {'email': email_address}
+        data = {
+            'email': email_address,
+            'admin_base_url': self.admin_url,
+        }
         if next_string:
             data['next'] = next_string
         self.post(endpoint, data=data)

tests/app/notify_client/test_user_client.py

@@ -306,3 +306,22 @@ def test_complete_webauthn_login_attempt_raises_on_api_error(fake_uuid, mocker):
 
     with pytest.raises(HTTPError):
         user_api_client.complete_webauthn_login_attempt(fake_uuid, is_successful=True)
+
+
+def test_reset_password(
+    mocker,
+    fake_uuid,
+):
+    mock_post = mocker.patch(
+        'app.notify_client.user_api_client.UserApiClient.post'
+    )
+
+    user_api_client.send_reset_password_url('test@example.com')
+
+    mock_post.assert_called_once_with(
+        '/user/reset-password',
+        data={
+            'email': 'test@example.com',
+            'admin_base_url': 'http://localhost:6012',
+        },
+    )