Added missing configs to fixt tests with Jest 28

config/jest/cssTransform.js

@@ -0,0 +1,12 @@
+// This is a custom Jest transformer turning style imports into empty objects.
+// http://facebook.github.io/jest/docs/en/webpack.html
+
+module.exports = {
+  process() {
+    return { code: 'module.exports = {};' };
+  },
+  getCacheKey() {
+    // The output is always the same.
+    return 'cssTransform';
+  },
+};