Updated Firebase mock to allow use of demo resume

__mocks__/gatsby-plugin-firebase.js

@@ -1,10 +1,46 @@
 import demoResume from '../src/data/demoState.json';
+import emptyResume from '../src/data/initialState.json';
+
+let resumesDictionary = {};
+let useDemoResume = false;
+
+const init = () => {
+  resumesDictionary['demore'] = demoResume;
+  resumesDictionary['mtre01'] = emptyResume;
+
+  for (var key in resumesDictionary) {
+    const resume = resumesDictionary[key];
+
+    resume.id = key;
+
+    let date = new Date('December 15, 2020 11:20:25');
+    resume.updatedAt = date.valueOf();
+    date.setMonth(date.getMonth() - 2);
+    resume.createdAt = date.valueOf();
+  }
+};
+
+const getResume = () => {
+  return useDemoResume ? demoResume : emptyResume;
+};
+
+const __useDemoResume = (value) => {
+  useDemoResume = value;
+};
+
+const __getResumeId = () => {
+  return getResume().id;
+};
+
+init();
 
 module.exports = {
+  __useDemoResume: __useDemoResume,
+  __getResumeId: __getResumeId,
   database: jest.fn().mockReturnValue({
     ref: jest.fn().mockReturnValue({
       once: jest.fn().mockResolvedValue({
-        val: jest.fn().mockReturnValue(demoResume),
+        val: jest.fn().mockReturnValue(getResume()),
       }),
     }),
   }),