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diff --git a/spec/frontend_integration/ide/user_opens_ide_spec.js b/spec/frontend_integration/ide/user_opens_ide_spec.js
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+++ b/spec/frontend_integration/ide/user_opens_ide_spec.js
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+import { useOverclockTimers } from 'test_helpers/utils/overclock_timers';
+import { findByText, screen } from '@testing-library/dom';
+import * as ideHelper from './helpers/ide_helper';
+
+describe('IDE: User opens IDE', () => {
+  useOverclockTimers();
+
+  let vm;
+  let container;
+
+  beforeEach(() => {
+    setFixtures('<div class="webide-container"></div>');
+    container = document.querySelector('.webide-container');
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+    vm = null;
+  });
+
+  it('shows loading indicator while the IDE is loading', async () => {
+    vm = ideHelper.createIdeComponent(container);
+
+    expect(container.querySelectorAll('.multi-file-loading-container')).toHaveLength(3);
+  });
+
+  describe('when the project is empty', () => {
+    beforeEach(() => {
+      vm = ideHelper.createIdeComponent(container, { isRepoEmpty: true });
+    });
+
+    it('shows "No files" in the left sidebar', async () => {
+      expect(await screen.findByText('No files')).toBeDefined();
+    });
+
+    it('shows a "New file" button', async () => {
+      const button = await screen.findByTitle('New file');
+
+      expect(button.tagName).toEqual('BUTTON');
+    });
+  });
+
+  describe('when the file tree is loaded', () => {
+    beforeEach(async () => {
+      vm = ideHelper.createIdeComponent(container);
+
+      await screen.findByText('README'); // wait for file tree to load
+    });
+
+    it('shows a list of files in the left sidebar', async () => {
+      expect(ideHelper.getFilesList()).toEqual(
+        expect.arrayContaining(['README', 'LICENSE', 'CONTRIBUTING.md']),
+      );
+    });
+
+    it('shows empty state in the main editor window', async () => {
+      expect(
+        await screen.findByText(
+          "Select a file from the left sidebar to begin editing. Afterwards, you'll be able to commit your changes.",
+        ),
+      ).toBeDefined();
+    });
+
+    it('shows commit button in disabled state', async () => {
+      const button = await screen.findByTestId('begin-commit-button');
+
+      expect(button.getAttribute('disabled')).toBeDefined();
+    });
+
+    it('shows branch/MR dropdown with master selected', async () => {
+      const dropdown = await screen.findByTestId('ide-nav-dropdown');
+
+      expect(dropdown.textContent).toContain('master');
+    });
+  });
+
+  describe('a path to a text file is present in the URL', () => {
+    beforeEach(async () => {
+      vm = ideHelper.createIdeComponent(container, { path: 'README.md' });
+
+      // a new tab is open for README.md
+      await findByText(document.querySelector('.multi-file-edit-pane'), 'README.md');
+    });
+
+    it('opens the file and its contents are shown in Monaco', async () => {
+      expect(await ideHelper.getEditorValue()).toContain('Sample repo for testing gitlab features');
+    });
+  });
+
+  describe('a path to a binary file is present in the URL', () => {
+    beforeEach(async () => {
+      vm = ideHelper.createIdeComponent(container, { path: 'Gemfile.zip' });
+
+      // a new tab is open for Gemfile.zip
+      await findByText(document.querySelector('.multi-file-edit-pane'), 'Gemfile.zip');
+    });
+
+    it('shows download viewer', async () => {
+      const downloadButton = await screen.findByText('Download');
+
+      expect(downloadButton.getAttribute('download')).toEqual('Gemfile.zip');
+      expect(downloadButton.getAttribute('href')).toContain('/raw/');
+    });
+  });
+
+  describe('a path to an image is present in the URL', () => {
+    beforeEach(async () => {
+      vm = ideHelper.createIdeComponent(container, { path: 'files/images/logo-white.png' });
+
+      // a new tab is open for logo-white.png
+      await findByText(document.querySelector('.multi-file-edit-pane'), 'logo-white.png');
+    });
+
+    it('shows image viewer', async () => {
+      const viewer = await screen.findByTestId('image-viewer');
+      const img = viewer.querySelector('img');
+
+      expect(img.src).toContain('logo-white.png');
+    });
+  });
+
+  describe('path in URL is a directory', () => {
+    beforeEach(async () => {
+      vm = ideHelper.createIdeComponent(container, { path: 'files/images' });
+
+      // wait for folders in left sidebar to be expanded
+      await screen.findByText('images');
+    });
+
+    it('expands folders in the left sidebar', () => {
+      expect(ideHelper.getFilesList()).toEqual(
+        expect.arrayContaining(['files', 'images', 'logo-white.png', 'logo-black.png']),
+      );
+    });
+
+    it('shows empty state in the main editor window', async () => {
+      expect(
+        await screen.findByText(
+          "Select a file from the left sidebar to begin editing. Afterwards, you'll be able to commit your changes.",
+        ),
+      ).toBeDefined();
+    });
+  });
+
+  describe("a file for path in url doesn't exist in the repo", () => {
+    beforeEach(async () => {
+      vm = ideHelper.createIdeComponent(container, { path: 'abracadabra/hocus-focus.txt' });
+
+      // a new tab is open for hocus-focus.txt
+      await findByText(document.querySelector('.multi-file-edit-pane'), 'hocus-focus.txt');
+    });
+
+    it('create new folders and file in the left sidebar', () => {
+      expect(ideHelper.getFilesList()).toEqual(
+        expect.arrayContaining(['abracadabra', 'hocus-focus.txt']),
+      );
+    });
+
+    it('creates a blank new file', async () => {
+      expect(await ideHelper.getEditorValue()).toEqual('\n');
+    });
+  });
+});