Make ‘Too many recipients’ error lower priority

This commit makes two main changes to what happens when a user is
in trial mode and they upload some email addresses belonging to
other people.

1. Add a specific banner error telling the user about trial mode

2. Make this error higher priority, eg it will show up before the
   error about having too many recipients in your file

This means making some changes to the tests so that the example CSV
files include the user’s phone number, then making them invalid by
omitting data required by the templates.

Depends on: https://github.com/alphagov/notifications-utils/pull/34

tests/app/main/views/test_send.py

@@ -72,7 +72,7 @@ def test_upload_csvfile_with_errors_shows_check_page_with_errors(
     mocker,
     mock_login,
     mock_get_service,
-    mock_get_service_template,
+    mock_get_service_template_with_placeholders,
     mock_s3_upload,
     mock_has_permissions,
     mock_get_users_by_service,
@@ -80,21 +80,27 @@ def test_upload_csvfile_with_errors_shows_check_page_with_errors(
     fake_uuid
 ):
 
-    contents = u'phone number,name\n+44 123,test1\n+44 456,test2'
-    mocker.patch('app.main.views.send.s3download', return_value=contents)
+    mocker.patch(
+        'app.main.views.send.s3download',
+        return_value="""
+            phone number,name
+            +447700900986
+            +447700900986
+        """
+    )
 
     with app_.test_request_context():
         with app_.test_client() as client:
             client.login(api_user_active)
             initial_upload = client.post(
                 url_for('main.send_messages', service_id=fake_uuid, template_id=fake_uuid),
-                data={'file': (BytesIO(contents.encode('utf-8')), 'invalid.csv')},
+                data={'file': (BytesIO(''.encode('utf-8')), 'invalid.csv')},
                 content_type='multipart/form-data',
                 follow_redirects=True
             )
             reupload = client.post(
                 url_for('main.check_messages', service_id=fake_uuid, template_type='sms', upload_id='abc123'),
-                data={'file': (BytesIO(contents.encode('utf-8')), 'invalid.csv')},
+                data={'file': (BytesIO(''.encode('utf-8')), 'invalid.csv')},
                 content_type='multipart/form-data',
                 follow_redirects=True
             )
@@ -102,9 +108,8 @@ def test_upload_csvfile_with_errors_shows_check_page_with_errors(
             assert response.status_code == 200
             content = response.get_data(as_text=True)
             assert 'There was a problem with invalid.csv' in content
-            assert '+44 123' in content
-            assert '+44 456' in content
-            assert 'Not a UK mobile number' in content
+            assert '+447700900986' in content
+            assert 'Missing' in content
             assert 'Re-upload your file' in content
 
 
@@ -354,7 +359,7 @@ def test_check_messages_should_revalidate_file_when_uploading_file(
     active_user_with_permissions,
     job_data,
     mock_create_job,
-    mock_get_service_template,
+    mock_get_service_template_with_placeholders,
     mock_s3_upload,
     mocker,
     mock_has_permissions,
@@ -368,8 +373,8 @@ def test_check_messages_should_revalidate_file_when_uploading_file(
         'app.main.views.send.s3download',
         return_value="""
             phone number,name,,,
-            123,test1,,,
-            123,test2,,,
+            +447700900986,,,,
+            +447700900986,,,,
         """
     )
     with app_.test_request_context():