Implement base tests for frooky agents

[bernhste]

Addresses #7

Testing was previously tracked in #52. This PR now only implements agent tests

The agent cannot be tested using common JavaScript/Node testing frameworks since the environment, for example, does not have a global variable, but one called global. And we must test it on devices, not mock mobile OS data types, etc.

So I made a (very tiny) testing framework located in agent/tests/test-framework.ts. The tests can be run using these node scripts:

• test:android
• test:ios

They basically run run-tests.js which implements the host logic:

• Starting the app org.owap.mastestapp
• Run all tests defined in agent/tests/android or agent/tests/ios respectively. They are fully asynchronous.
• Return the results

The tests are written like Jests-Tests:

import { generateUUID } from "../../android/android-agent"

test('Test UUID generator', () => {
    const uuid = generateUUID();

    // UUID v4 regex pattern
    const uuidV4Regex = /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;

    expect(uuidV4Regex.test(uuid)).toBeTruthy();
});

What is not yet implemented is the GitHub Action. But this can be done like that:

• Make sure a virtual device is running
• Make sure the unit test target app is running with Frida as an embedded gadget
• Run npm run test:android or npm run test:ios

This is the output the android test:

(venv) ➜  agent git:(testing-agent) ✗ npm run test:android

> frooky-agent@0.0.1 test:android
> npm run build:test:android && node run-tests.js -p android


> frooky-agent@0.0.1 build:test:android
> frida-compile --type-check none tests/android/runner.ts -o dist/agent-test-android.js

  ✅ PASS: Test UUID generator

✅ PASS: All tests passed.

The process will return 0 if all goes well.