Fix act() warnings on newly created plugin test run

packages/cli/templates/default-plugin/package.json.hbs

@@ -12,7 +12,8 @@
   },
   "devDependencies": {
     "@spotify-backstage/cli": "^{{version}}",
-    "@types/testing-library__jest-dom": "5.0.2"
+    "@types/testing-library__jest-dom": "5.0.2",
+    "jest-fetch-mock": "^3.0.3"
   },
   "dependencies": {
     "@material-ui/lab": "4.0.0-alpha.45"

packages/cli/templates/default-plugin/src/components/ExampleComponent/ExampleComponent.test.tsx.hbs

@@ -16,12 +16,14 @@
 
 import React from 'react';
 import { render } from '@testing-library/react';
+import mockFetch from 'jest-fetch-mock';
 import ExampleComponent from './ExampleComponent';
 import { ThemeProvider } from '@material-ui/core';
 import { BackstageTheme } from '@spotify-backstage/core';
 
 describe('ExampleComponent', () => {
   it('should render', () => {
+    mockFetch.mockResponse(() => new Promise(() => {}));
     const rendered = render(
       <ThemeProvider theme={BackstageTheme}>
         <ExampleComponent />

packages/cli/templates/default-plugin/src/components/ExampleFetchComponent/ExampleFetchComponent.test.tsx.hbs

@@ -16,11 +16,13 @@
 
 import React from 'react';
 import { render } from '@testing-library/react';
+import mockFetch from 'jest-fetch-mock';
 import ExampleFetchComponent from './ExampleFetchComponent';
 
 describe('ExampleFetchComponent', () => {
-  it('should render', () => {
+  it('should render', async () => {
+    mockFetch.mockResponse(() => new Promise(() => {}));
     const rendered = render(<ExampleFetchComponent />);
-    expect(rendered.getByTestId('progress')).toBeInTheDocument();
+    expect(await rendered.findByTestId('progress')).toBeInTheDocument();
   });
 });

packages/cli/templates/default-plugin/src/setupTests.ts

@@ -15,3 +15,4 @@
  */
 
 import '@testing-library/jest-dom/extend-expect';
+require('jest-fetch-mock').enableMocks();

scripts/cli-e2e-test.js

@@ -37,7 +37,8 @@ async function main() {
 
     const createPlugin = spawnPiped(['yarn', 'create-plugin']);
     createPlugin.stdin.write('test-plugin\n');
-    await new Promise(resolve => setTimeout(resolve, 2000));
+    // TODO: Add code to await the right prompts from create-plugin stdout instead
+    await new Promise(resolve => setTimeout(resolve, 5000));
     createPlugin.stdin.write('@someuser\n');
 
     print('Waiting for plugin create script to be done');