In Angular, a service is typically injected into a component's constructor through the component's _____.
- constructor
- ngInject
- ngOnChanges
- ngOnInit
In Angular, a service is typically injected into a component's constructor through the component's constructor.
You are building an admin panel where certain routes should only be activated if the user has the required permissions. How can you utilize Route Resolvers to ensure that the data indicating permission is fetched before navigation?
- Implement an Angular Service to fetch data
- Include a custom Angular directive
- Use a Route Resolver
- Utilize Route Guards
To ensure that data indicating permissions is fetched before navigation, you can utilize a Route Resolver. The resolver can fetch the required data and halt route activation until the data is available and evaluated for permissions.
When a service is provided at the root level, it is available throughout the entire _____.
- application
- application module
- component
- module
When a service is provided at the root level, it is available throughout the entire application.
How can you pass data to a Route Guard in Angular?
- Direct function argument
- Query parameters
- Router configuration
- Shared service
In Angular, you can pass data to a Route Guard by using a Shared service to store and share data between components and guards.
To submit a form in Angular, you typically bind the submit event to a method in your component class using _____ .
- formAction
- formSubmit
- ngSubmit
- submitForm
To submit a form in Angular, you typically bind the submit event to a method in your component class using ngSubmit.
If a pipe takes multiple input values, how should it be tested to ensure all cases are covered?
- Rely on integration tests to cover all possible input combinations
- Skip testing for cases with complex input values
- Use a single test case with multiple input values and expected results
- Write separate test cases for each combination of input values
To ensure all cases are covered when testing a pipe with multiple input values, you should write separate test cases for each combination of input values.
When using NgRx, how can you prevent unnecessary re-rendering of components when the state changes?
- Use ChangeDetectionStrategy.OnPush
- Use ChangeDetectorRef.markForCheck
- Use pure pipes
- Use the async pipe
In NgRx, you can prevent unnecessary re-rendering of components by using ChangeDetectionStrategy.OnPush to only update components when necessary.
How can you preload some, but not all, of the lazily-loaded modules in an Angular application?
- It's not possible
- Setting the 'preload' property
- Using canActivateChild guard
- Using the preloadStrategy
You can preload some, but not all, of the lazily-loaded modules in Angular by specifying the preloadStrategy in the route configuration.
To perform side-effect-free computations synchronously, Angular provides a testing utility known as _____.
- HttpClientTestingModule
- JasmineSpy
- MockAsyncService
- TestBed
To perform side-effect-free computations synchronously in Angular, you can use the TestBed utility for creating and configuring testing modules.
How can you test that a directive correctly responds to changes in input values?
- Directly manipulate the directive's DOM elements and observe changes
- Manually update the directive's input values and check the DOM
- Use the TestBed's detectChanges method to trigger change detection
- Use the ng test CLI command to automate the testing process
To test that a directive correctly responds to input value changes, you should use the TestBed's detectChanges method to trigger change detection.
What is the role of fixture in Angular component tests?
- Hold data
- Manage test configuration
- Render the component
- Simulate user interactions
The role of the fixture in Angular component tests is to render the component for testing and provide a handle for simulating user interactions.
You are writing a test for an Angular component that renders a list of items. You want to test that when a new item is added, it is correctly displayed in the component. Which testing technique or utility would be best suited for this?
- End-to-End Testing with Protractor
- Integration Testing with Karma and Jasmine
- No testing needed - it's an Angular feature
- Unit Testing with TestBed
For testing component behavior in isolation, Unit Testing with TestBed is the most suitable approach. It allows you to create an isolated testing environment for the component.