docs: fix example "testing" app compilation (#30427)

PR Close #30427

aio/content/examples/testing/src/app/model/testing/index.ts

@@ -1 +1 @@
-export * from './fake-hero.service';
+export * from './test-hero.service';

aio/tools/examples/example-boilerplate.js

@@ -35,7 +35,12 @@ BOILERPLATE_PATHS.i18n = [...cliRelativePath, 'angular.json', 'package.json'];
 
 BOILERPLATE_PATHS['service-worker'] = [...cliRelativePath, 'angular.json', 'package.json'];
 
-BOILERPLATE_PATHS.testing = [...cliRelativePath, 'angular.json'];
+BOILERPLATE_PATHS.testing = [
+  ...cliRelativePath,
+  'angular.json',
+  'src/tsconfig.app.json',
+  'src/tsconfig.spec.json'
+];
 
 BOILERPLATE_PATHS.universal = [...cliRelativePath, 'angular.json', 'package.json'];
 

aio/tools/examples/shared/boilerplate/testing/src/tsconfig.app.json

@@ -0,0 +1,22 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../out-tsc/app",
+    "types": []
+  },
+  "exclude": [
+    "test.ts",
+    "**/*.spec.ts",
+    "**/*.avoid.ts",
+    "**/*.0.ts",
+    "**/*.1.ts",
+    "**/*.1b.ts",
+    "**/*.2.ts",
+    "**/*.3.ts",
+    "**/*.4.ts",
+    "**/*.5.ts",
+    "**/*.6.ts",
+    "**/*.7.ts",
+    "**/testing"
+  ]
+}

aio/tools/examples/shared/boilerplate/testing/src/tsconfig.spec.json

@@ -0,0 +1,19 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../out-tsc/spec",
+    "types": [
+      "jasmine",
+      "node"
+    ]
+  },
+  "files": [
+    "test.ts",
+    "polyfills.ts"
+  ],
+  "include": [
+    "**/*.spec.ts",
+    "**/*.d.ts",
+    "**/testing"
+  ]
+}