diff --git a/__mocks__/gatsby-plugin-firebase.js b/__mocks__/gatsby-plugin-firebase.js
index 226d95dc..fc423c6f 100644
--- a/__mocks__/gatsby-plugin-firebase.js
+++ b/__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,
   };
 };
 
diff --git a/src/pages/app/__tests__/builder.test.js b/src/pages/app/__tests__/builder.test.js
index f09a052b..56fea655 100644
--- a/src/pages/app/__tests__/builder.test.js
+++ b/src/pages/app/__tests__/builder.test.js
@@ -1,5 +1,12 @@
 import React from 'react';
-import { act, cleanup, render, screen } from '@testing-library/react';
+import {
+  act,
+  cleanup,
+  fireEvent,
+  render,
+  screen,
+  waitFor,
+} from '@testing-library/react';
 
 import firebaseMock from 'gatsby-plugin-firebase';
 
@@ -20,31 +27,31 @@ describe('builder', () => {
   let resumeId = null;
   let resume = null;
 
-  describe('with demo resume', () => {
-    beforeEach(async () => {
-      resumeId = firebaseMock.database().__demoResumeId;
-      resume = (
-        await firebaseMock.database().ref(`resumes/${resumeId}`).once('value')
-      ).val();
+  beforeEach(async () => {
+    resumeId = firebaseMock.database().__demoResumeId;
+    resume = (
+      await firebaseMock.database().ref(`resumes/${resumeId}`).once('value')
+    ).val();
 
-      render(
-        <UserProvider>
-          <DatabaseProvider>
-            <ResumeProvider>
-              <StorageProvider>
-                <Builder id={resume.id} />
-              </StorageProvider>
-            </ResumeProvider>
-          </DatabaseProvider>
-        </UserProvider>,
-      );
+    render(
+      <UserProvider>
+        <DatabaseProvider>
+          <ResumeProvider>
+            <StorageProvider>
+              <Builder id={resume.id} />
+            </StorageProvider>
+          </ResumeProvider>
+        </DatabaseProvider>
+      </UserProvider>,
+    );
 
-      await act(async () => {
-        await firebaseMock.auth().signInAnonymously();
-      });
+    await act(async () => {
+      await firebaseMock.auth().signInAnonymously();
     });
+  });
 
-    it('renders first and last name', async () => {
+  describe('renders', () => {
+    it('first and last name', async () => {
       expect(
         screen.getByLabelText(new RegExp('first name', 'i')),
       ).toHaveDisplayValue(resume.profile.firstName);
@@ -60,37 +67,30 @@ describe('builder', () => {
     });
   });
 
-  describe('with empty resume', () => {
-    beforeEach(async () => {
-      resumeId = firebaseMock.database().__emptyResumeId;
+  describe('updates data', () => {
+    it('when input value is changed', async () => {
+      const input = screen.getByLabelText(new RegExp('address line 1', 'i'));
+      const newInputValue = 'test street 123';
+      const spy = jest.spyOn(
+        firebaseMock.database().ref(`resumes/${resumeId}`),
+        'update',
+      );
+
+      fireEvent.change(input, { target: { value: newInputValue } });
+
+      expect(input.value).toBe(newInputValue);
+
+      await waitFor(() => expect(spy).toHaveBeenCalledTimes(1), {
+        timeout: 4000,
+      });
+      //const promise = spy.mock.results[0].value;
+      //await spy();
+      //expect(spy).toHaveBeenCalledTimes(1);
+
       resume = (
         await firebaseMock.database().ref(`resumes/${resumeId}`).once('value')
       ).val();
-
-      render(
-        <UserProvider>
-          <DatabaseProvider>
-            <ResumeProvider>
-              <StorageProvider>
-                <Builder id={resume.id} />
-              </StorageProvider>
-            </ResumeProvider>
-          </DatabaseProvider>
-        </UserProvider>,
-      );
-
-      await act(async () => {
-        await firebaseMock.auth().signInAnonymously();
-      });
-    });
-
-    it('renders empty first and last name', async () => {
-      expect(
-        screen.getByLabelText(new RegExp('first name', 'i')),
-      ).not.toHaveDisplayValue();
-      expect(
-        screen.getByLabelText(new RegExp('last name', 'i')),
-      ).not.toHaveDisplayValue();
+      expect(resume.profile.address.line1).toBe(newInputValue);
     });
   });
 });