feat(@angular-devkit/build-angular): add aot option to jest

Author: yjaaidi

packages/angular_devkit/build_angular/src/builders/jest/index.ts

@@ -85,7 +85,7 @@ export default createBuilder(
           tsConfig: options.tsConfig,
           polyfills: options.polyfills ?? ['zone.js', 'zone.js/testing'],
           outputPath: testOut,
-          aot: false,
+          aot: options.aot,
           index: false,
           outputHashing: OutputHashing.None,
           outExtension: 'mjs', // Force native ESM.

packages/angular_devkit/build_angular/src/builders/jest/schema.json

@@ -32,6 +32,11 @@
         "uniqueItems": true
       },
       "default": []
+    },
+    "aot": {
+      "type": "boolean",
+      "description": "Run tests using Ahead of Time compilation.",
+      "default": false
     }
   },
   "additionalProperties": false,

tests/legacy-cli/e2e/tests/jest/aot.ts

@@ -0,0 +1,41 @@
+import { deleteFile, writeFile } from '../../utils/fs';
+import { updateJsonFile } from '../../utils/project';
+import { applyJestBuilder } from '../../utils/jest';
+import { ng } from '../../utils/process';
+
+export default async function (): Promise<void> {
+  await applyJestBuilder();
+
+  {
+    await updateJsonFile('tsconfig.spec.json', (json) => {
+      return {
+        ...json,
+        include: ['src/**/*.spec.ts'],
+      };
+    });
+
+    await writeFile(
+      'src/aot.spec.ts',
+      `
+  import { Component } from '@angular/core';
+  
+  describe('Hello', () => {
+    it('should *not* contain jit instructions', () => {
+      @Component({
+        template: 'Hello',
+      })
+      class Hello {}
+
+      expect((Hello as any).ɵcmp.template.toString()).not.toContain('jit');
+    });
+  });
+    `.trim(),
+    );
+
+    const { stderr } = await ng('test', '--aot');
+
+    if (!stderr.includes('Ran all test suites.') || stderr.includes('failed')) {
+      throw new Error(`Components were not transformed using AOT.\STDERR:\n\n${stderr}`);
+    }
+  }
+}