Make one-off error refer to correct message type

This was hard coded to say ‘You can’t send to this phone number’ even
when you were trying to send an email.

app/templates/views/notifications/check.html

@@ -12,7 +12,9 @@
       {% call banner_wrapper(type='dangerous') %}
         {% with
           count_of_recipients=1,
-          template_type_label='phone number'
+          template_type_label=(
+            'phone number' if template.template_type == 'sms' else 'email address'
+          )
         %}
           {% include "partials/check/not-allowed-to-send-to.html" %}
         {% endwith %}

tests/app/main/views/test_send.py

@@ -1940,3 +1940,32 @@ def test_send_notification_shows_error_if_400(
     assert normalize_spaces(page.select('.banner-dangerous h1')[0].text) == expected_h1
     assert normalize_spaces(page.select('.banner-dangerous p')[0].text) == expected_err_details
     assert not page.find('input[type=submit]')
+
+
+def test_send_notification_shows_email_error_in_trial_mode(
+    client_request,
+    fake_uuid,
+    mocker,
+    mock_get_service_email_template,
+):
+    mocker.patch(
+        'app.notification_api_client.send_notification',
+        side_effect=HTTPError(response=Mock(status_code=400), message=TRIAL_MODE_MSG)
+    )
+    with client_request.session_transaction() as session:
+        session['recipient'] = 'test@example.com'
+        session['placeholders'] = {'date': 'foo', 'thing': 'bar'}
+
+    page = client_request.post(
+        'main.send_notification',
+        service_id=SERVICE_ONE_ID,
+        template_id=fake_uuid,
+        _expected_status=200,
+    )
+
+    assert normalize_spaces(page.select('.banner-dangerous h1')[0].text) == (
+        'You can’t send to this email address'
+    )
+    assert normalize_spaces(page.select('.banner-dangerous p')[0].text) == (
+        'In trial mode you can only send to yourself and members of your team'
+    )