Add tests for render_bundle templatetag

hypha/apply/utils/tests/test_templatetags.py

+from unittest import mock
+
+from django.test import SimpleTestCase, override_settings
+
+from hypha.apply.utils.templatetags.webpack_tags import render_bundle
+
+
+class WebpackTagsTestCase(SimpleTestCase):
+
+    @override_settings(ENABLE_WEBPACK_BUNDLES=True)
+    def test_render_bundle_calls_webpack_loader_when_enabled(self):
+        render_bundle_path = 'hypha.apply.utils.templatetags.webpack_tags.webpack_loader.render_bundle'
+
+        with mock.patch(render_bundle_path, return_value='foo.js') as mocked_render_bundle:
+            self.assertEqual(render_bundle('foo', 'js'), 'foo.js')
+
+            mocked_render_bundle.assert_called_once_with('foo', 'js', 'DEFAULT', '')
+
+    @override_settings(ENABLE_WEBPACK_BUNDLES=False)
+    def test_render_bundle_does_not_call_webpack_loader_when_disabled(self):
+        render_bundle_path = 'hypha.apply.utils.templatetags.webpack_tags.webpack_loader.render_bundle'
+
+        with mock.patch(render_bundle_path, return_value='foo.js') as mocked_render_bundle:
+            self.assertEqual(render_bundle('foo', 'js'), '')
+
+            self.assertFalse(mocked_render_bundle.called)