Builder.test: added draft version of test for data update

__mocks__/gatsby-plugin-firebase.js

@@ -125,17 +125,37 @@ const database = () => {
       return Promise.resolve();
     };
 
+    const update = async (value) => {
+      console.log('update');
+      console.log(value);
+      if (resumesPath) {
+        if (value === null) {
+          delete __resumesDictionary[databaseLocationId];
+        } else {
+          __resumesDictionary[databaseLocationId] = value;
+        }
+      }
+
+      return Promise.resolve();
+    };
+
     return {
       once,
       set,
+      update,
     };
   };
 
+  const ServerValue = {
+    TIMESTAMP: Date.now(),
+  };
+
   return {
     __demoResumeId,
     __emptyResumeId,
     __init,
     ref,
+    ServerValue,
   };
 };