Update govuk_text_input_field_widget to only show one error

If there were multiple errors, this widget was joining the messages
together and displaying all error messages. If a text input field does
have more than one validation error, we only want to show one.

tests/app/main/views/test_service_settings.py

@@ -2361,6 +2361,27 @@ def test_incorrect_sms_sender_input(
         assert count_of_api_calls == 0
 
 
+def test_incorrect_sms_sender_input_with_multiple_errors_only_shows_the_first(
+    client_request,
+    no_sms_senders,
+    mock_add_sms_sender,
+):
+    # There are two errors with the SMS sender - the length and characters used. Only one
+    # should be displayed on the page.
+    page = client_request.post(
+        'main.service_add_sms_sender',
+        service_id=SERVICE_ONE_ID,
+        _data={'sms_sender': '{}'},
+        _expected_status=200
+    )
+
+    error_message = page.select_one('.govuk-error-message')
+    count_of_api_calls = len(mock_add_sms_sender.call_args_list)
+
+    assert normalize_spaces(error_message.text) == 'Error: Enter 3 characters or more'
+    assert count_of_api_calls == 0
+
+
 @pytest.mark.parametrize('reply_to_addresses, data, api_default_args', [
     ([], {}, True),
     (create_multiple_email_reply_to_addresses(), {}, False),

tests/app/main/views/test_user_profile.py

@@ -110,6 +110,26 @@ def test_should_redirect_after_email_change(
     )
 
 
+@pytest.mark.parametrize('email_address,error_message', [
+    ('me@example.com', 'Enter a public sector email address or find out who can use Notify'),
+    ('not_valid', 'Enter a valid email address')  # 2 errors with email address, only first error shown
+])
+def test_should_show_errors_if_new_email_address_does_not_validate(
+    client_request,
+    mock_email_is_not_already_in_use,
+    mock_get_organisations,
+    email_address,
+    error_message,
+):
+    page = client_request.post(
+        'main.user_profile_email',
+        _data={'email_address': email_address},
+        _expected_status=200,
+    )
+
+    assert normalize_spaces(page.find('span', class_='govuk-error-message').text) == f'Error: {error_message}'
+
+
 def test_should_show_authenticate_after_email_change(
     client_request,
 ):