test: we actually need the env.config.js file for the example app

Previous commit removed this file, forgetting that it’s also necessary for the example app.  Reinstated it here with a value specific to the example app so we can still prove the test suite works.

env.config.js

@@ -0,0 +1,8 @@
+// NOTE: This file is used by the example app.  frontend-build expects the file
+// to be in the root of the repository.  This is not used by the actual frontend-platform library.
+// Also note that in an actual application this file would be added to .gitignore.
+const config = {
+  JS_FILE_VAR: 'JS_FILE_VAR_VALUE_FOR_EXAMPLE_APP',
+};
+
+export default config;

src/initialize.const.config.test.js

@@ -39,5 +39,4 @@ describe('initialize with constant js file config', () => {
 
     expect(config.JS_FILE_VAR).toEqual('JS_FILE_VAR_VALUE_CONSTANT');
   });
-
 });