add testing lib jest dom types, fixes #311

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

@@ -11,7 +11,8 @@
     "test": "backstage-cli test"
   },
   "devDependencies": {
-    "@spotify-backstage/cli": "^{{version}}"
+    "@spotify-backstage/cli": "^{{version}}",
+    "@types/testing-library__jest-dom": "5.0.2"
   },
   "dependencies": {
     "@material-ui/lab": "4.0.0-alpha.45"

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

@@ -17,10 +17,15 @@
 import React from 'react';
 import { render } from '@testing-library/react';
 import ExampleComponent from './ExampleComponent';
+import { ThemeProvider } from '@material-ui/core';
+import { BackstageTheme } from '@spotify-backstage/core';
 
 describe('ExampleComponent', () => {
   it('should render', () => {
-    const rendered = render(<ExampleComponent />);
+    const rendered = render(
+      <ThemeProvider theme={BackstageTheme}>
+        <ExampleComponent />
+      </ThemeProvider>,);
     expect(rendered.getByText('Welcome to {{ id }}!')).toBeInTheDocument();
   });
 });

yarn.lock

@@ -3057,6 +3057,14 @@
     "@types/istanbul-lib-coverage" "*"
     "@types/istanbul-lib-report" "*"
 
+"@types/jest@*":
+  version "25.1.4"
+  resolved "https://registry.npmjs.org/@types/jest/-/jest-25.1.4.tgz#9e9f1e59dda86d3fd56afce71d1ea1b331f6f760"
+  integrity sha512-QDDY2uNAhCV7TMCITrxz+MRk1EizcsevzfeS6LykIlq2V1E5oO4wXG8V2ZEd9w7Snxeeagk46YbMgZ8ESHx3sw==
+  dependencies:
+    jest-diff "^25.1.0"
+    pretty-format "^25.1.0"
+
 "@types/jest@^24.0.0":
   version "24.9.1"
   resolved "https://registry.npmjs.org/@types/jest/-/jest-24.9.1.tgz#02baf9573c78f1b9974a5f36778b366aa77bd534"
@@ -3231,6 +3239,13 @@
   dependencies:
     pretty-format "^24.3.0"
 
+"@types/testing-library__jest-dom@5.0.2":
+  version "5.0.2"
+  resolved "https://registry.npmjs.org/@types/testing-library__jest-dom/-/testing-library__jest-dom-5.0.2.tgz#89b782e0f187fe1e80d6375133da74182ba02065"
+  integrity sha512-dZP+/WHndgCSmdaImITy0KhjGAa9c0hlGGkzefbtrPFpnGEPZECDA0zyvfSp8RKhHECJJSKHFExjOwzo0rHyIA==
+  dependencies:
+    "@types/jest" "*"
+
 "@types/testing-library__react@^9.1.2":
   version "9.1.2"
   resolved "https://registry.npmjs.org/@types/testing-library__react/-/testing-library__react-9.1.2.tgz#e33af9124c60a010fc03a34eff8f8a34a75c4351"