Fixed tests following horizontal form changes

* error class has changed to `invalid-feedback`

Author: smithdc1

tests/test_generics.py

@@ -163,7 +163,7 @@ def test_post_error_root_view(self):
         data = {'text': 'foobar' * 100}
         request = factory.post('/', data, HTTP_ACCEPT='text/html')
         response = self.view(request).render()
-        expected_error = '<span class="help-block">Ensure this field has no more than 100 characters.</span>'
+        expected_error = '<span class="invalid-feedback">Ensure this field has no more than 100 characters.</span>'
         assert expected_error in response.rendered_content.decode()
 
 
@@ -310,7 +310,7 @@ def test_put_error_instance_view(self):
         data = {'text': 'foobar' * 100}
         request = factory.put('/', data, HTTP_ACCEPT='text/html')
         response = self.view(request, pk=1).render()
-        expected_error = '<span class="help-block">Ensure this field has no more than 100 characters.</span>'
+        expected_error = '<span class="invalid-feedback">Ensure this field has no more than 100 characters.</span>'
         assert expected_error in response.rendered_content.decode()