Toolkit: add junit reporting and jest.config.js to plugin build (#22450)

packages/grafana-toolkit/src/cli/tasks/plugin/tests.ts

 import * as jestCLI from 'jest-cli';
 import { useSpinner } from '../../utils/useSpinner';
-import { jestConfig } from '../../../config/jest.plugin.config';
+import { loadJestPluginConfig } from '../../../config/jest.plugin.config';
 
 export interface PluginTestOptions {
   updateSnapshot: boolean;
@@ -13,7 +13,7 @@ export interface PluginTestOptions {
 export const testPlugin = useSpinner<PluginTestOptions>(
   'Running tests',
   async ({ updateSnapshot, coverage, watch, testPathPattern, testNamePattern }) => {
-    const testConfig = jestConfig();
+    const testConfig = loadJestPluginConfig();
 
     const cliConfig = {
       config: JSON.stringify(testConfig),

packages/grafana-toolkit/src/cli/tasks/toolkit.build.ts

@@ -60,6 +60,7 @@ const copyFiles = () => {
     'src/config/tsconfig.plugin.local.json',
     'src/config/eslint.plugin.json',
     'src/config/styles.mock.js',
+    'src/config/jest.plugin.config.local.js',
 
     // plugin test file
     'src/plugins/e2e/commonPluginTests.ts',

packages/grafana-toolkit/src/config/jest.plugin.config.local.js

+// This file is needed because it is used by vscode and other tools that
+// call `jest` directly.  However, unless you are doing anything special
+// do not edit this file
+
+const standard = require('@grafana/toolkit/src/config/jest.plugin.config');
+
+// This process will use the same config that `yarn test` is using
+module.exports = standard.jestConfig();

packages/grafana-toolkit/src/config/jest.plugin.config.ts

@@ -57,9 +57,23 @@ export const jestConfig = (baseDir: string = process.cwd()) => {
     moduleDirectories: ['node_modules', 'src'],
     moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
     setupFiles,
-    globals: { 'ts-jest': { isolatedModules: true } },
+    globals: {
+      'ts-jest': {
+        isolatedModules: true,
+        tsConfig: path.resolve(baseDir, 'tsconfig.json'),
+      },
+    },
     coverageReporters: ['json-summary', 'text', 'lcov'],
     collectCoverageFrom: ['src/**/*.{ts,tsx}', '!**/node_modules/**', '!**/vendor/**'],
+    reporters: [
+      'default',
+      [
+        'jest-junit',
+        {
+          outputDirectory: 'coverage',
+        },
+      ],
+    ],
     testMatch: [
       '<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}',
       '<rootDir>/src/**/*.{spec,test,jest}.{js,jsx,ts,tsx}',
@@ -80,3 +94,16 @@ export const jestConfig = (baseDir: string = process.cwd()) => {
     ...otherOverrides,
   };
 };
+
+/**
+ * This will load the existing just setup, or use the default if it exists
+ */
+export const loadJestPluginConfig = (baseDir: string = process.cwd()) => {
+  const cfgpath = path.resolve(baseDir, 'jest.config.js');
+  if (!fs.existsSync(cfgpath)) {
+    const src = path.resolve(baseDir, 'node_modules/@grafana/toolkit/src/config/jest.plugin.config.local.js');
+    fs.copyFileSync(src, cfgpath);
+    console.log('Using standard jest plugin config', src);
+  }
+  return require(cfgpath);
+};