chore(aws-cdk-lib): increase jest test speed, remove warnings (#26854)

Two changes to the `jest` tests:

- We are currently running the tests directly from `.ts` source files using `ts-jest`. Disable type checking (by setting `isolatedModules: true`) to improve the speed. This brings down running 4 test suites from an arbitrary service (`aws-servicecatalog`) down from `79s` to `19s` on my machine.
- Change the "coverage ignore files" a little to get rid of the "Note: The code generator has deoptimised the styling" errors produced by jest when it wants to read the coverage of the generated source files.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: rix0rrr

nx.json

@@ -11,7 +11,8 @@
         "!{workspaceRoot}/**/tsconfig.json",
         "!{workspaceRoot}/**/tsconfig.json",
         "!{workspaceRoot}/tsconfig.base.json",
-        "!{workspaceRoot}/**/tsconfig.tsbuildinfo"
+        "!{workspaceRoot}/**/tsconfig.tsbuildinfo",
+        "!{workspaceRoot}/**/jest.config.js"
       ],
       "outputs": [
         "{projectRoot}/**/*.integ.*.js.snapshot/*",

package.json

@@ -28,6 +28,7 @@
     "jsii-pacmak": "1.87.0",
     "jsii-reflect": "1.87.0",
     "jsii-rosetta": "~5.1.10",
+    "ts-jest": "^29.1.1",
     "lerna": "^7.1.5",
     "nx": "^16.7.3",
     "patch-package": "^6.5.1",

packages/@aws-cdk-testing/cli-integ/test/resource-pool.test.ts

@@ -1,6 +1,8 @@
 import { sleep } from '../lib';
 import { ResourcePool } from '../lib/resource-pool';
 
+jest.setTimeout(30_000);
+
 const POOL_NAME = 'resource-pool.test';
 
 test('take and dispose', async () => {

packages/@aws-cdk-testing/framework-integ/.gitignore

@@ -14,4 +14,6 @@ nyc.config.js
 
 !**/*.snapshot/**/asset.*/**
 
-**/*.ts.snapshot
+**/*.ts.snapshot
+
+!jest.config.js

packages/@aws-cdk-testing/framework-integ/jest.config.js

@@ -0,0 +1,14 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+  // Purposely only run .js files, not .ts files. This is so that the unit tests
+  // here will use the jsii-compiled version of `aws-cdk-lib`, and not the live-interpreted
+  // .ts files.
+  moduleFileExtensions: [
+    'js',
+  ],
+  testMatch: [
+    '<rootDir>/test/**/?(*.)+(test).js',
+  ],
+
+  testEnvironment: 'node',
+};