[test] Assertion counting

Author: jamesgpearce

gulpfile.mjs

@@ -621,7 +621,7 @@ const test = async (
       'coverage.json',
       JSON.stringify({
         ...(countAsserts
-          ? JSON.parse(await promises.readFile('./tmp/assertion-summary.json'))
+          ? JSON.parse(await promises.readFile('./tmp/counts.json'))
           : {}),
         ...JSON.parse(await promises.readFile('./tmp/coverage-summary.json'))
           .total,
@@ -784,4 +784,4 @@ export const prePublishPackage = series(
   testE2e,
 );
 
-export const publishPackage = series(prePublishPackage, npmPublish);
+export const publishPackage = series(prePublishPackage, npmPublish);

test/jest/environment.js

@@ -1,9 +1,12 @@
+import {writeFileSync} from 'fs';
 import {TestEnvironment} from 'jest-environment-jsdom';
 import {TextDecoder, TextEncoder} from 'util';
 import {BroadcastChannel} from 'worker_threads';
 
-export default class extends TestEnvironment {
-  static assertionCalls = 0;
+export default class TinyBaseEnvironment extends TestEnvironment {
+  static tests = 0;
+  static assertions = 0;
+
   async setup() {
     Object.assign(this.global, {
       TextDecoder,
@@ -18,4 +21,16 @@ export default class extends TestEnvironment {
     });
     await super.setup();
   }
+
+  async teardown() {
+    writeFileSync(
+      './tmp/counts.json',
+      JSON.stringify({
+        tests: TinyBaseEnvironment.tests,
+        assertions: TinyBaseEnvironment.assertions,
+      }),
+      'utf-8',
+    );
+    await super.teardown();
+  }
 }

test/jest/reporter.js

@@ -1,17 +1,15 @@
-import env from './environment.js';
-import {writeFileSync} from 'fs';
+import {readFileSync} from 'fs';
 
 export default class {
-  onRunComplete(_contexts, results) {
-    writeFileSync(
-      './tmp/assertion-summary.json',
-      JSON.stringify({
-        tests: results.numTotalTests,
-        assertions: env.assertionCalls,
-      }),
-      'utf-8',
-    );
+  onRunComplete() {
+    const counts = JSON.parse(readFileSync('./tmp/counts.json', 'utf-8'));
     // eslint-disable-next-line no-console
-    console.log('Assertions:', env.assertionCalls, '\n');
+    console.log(
+      'Tests:',
+      counts.tests,
+      '\nAssertions:',
+      counts.assertions,
+      '\n',
+    );
   }
 }

test/jest/setup.js

@@ -1,5 +1,7 @@
 jest.retryTimes(10);
 
-afterEach(
-  () => (global.env.assertionCalls += expect.getState().assertionCalls),
-);
+afterEach(() => {
+  const {assertionCalls} = expect.getState();
+  global.env.tests += 1;
+  global.env.assertions += assertionCalls;
+});