Angular Web Framework Angular Quality & Compliance 4

Question 1

Which Protractor (or Cypress) concept is equivalent to Angular's `waitForAngular` that ensures the app is stable before assertions?

Accepted Answer

Angular zone stability check

Answer

Tools aware of Angular's Zone.js wait for the zone to become stable (no pending microtasks or timers) before proceeding, ensuring the app is fully rendered.

Question 2

What does enabling `strictNullChecks` in `tsconfig.json` enforce in an Angular application?

Accepted Answer

Variables cannot hold null or undefined unless explicitly typed to allow it

Answer

With `strictNullChecks`, TypeScript requires developers to explicitly handle `null` and `undefined` in type declarations, preventing null reference errors at runtime.

Question 3

When should you use `spyOn(service, 'method').and.returnValue(of(data))` in an Angular test?

Accepted Answer

When mocking an Observable-returning service method to control test data

Answer

Spying on a method and returning a controlled Observable with `of(data)` lets you isolate the component under test from real service logic and async behavior.

Question 4

What is a 'shallow' component test in Angular?

Accepted Answer

A test that renders the component without fully rendering its child components

Answer

Shallow testing renders only the component under test while stubbing or ignoring child components, reducing test complexity and coupling.

Question 5

What Angular feature helps enforce that private API surfaces are not accidentally exported in a library?

Accepted Answer

The `public_api.ts` barrel file combined with `ng-packagr`

Answer

`ng-packagr` uses `public_api.ts` as the entry point, so only symbols explicitly exported there become part of the library's public API.

Angular Web Framework Practice Test

Angular Web Framework Practice Test

Angular Web Framework Angular Quality & Compliance 4