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What is a test directive?

What is a test directive?

In this chapter, you’ll learn how to test directives. Directives, like components, are a way to encapsulate parts of your application as reusable chunks of code. With regard to functionality, both directives and components allow you to add behavior to the HTML in your application.

What are the directives in Angular?

Directives are classes that add additional behavior to elements in your Angular applications. Use Angular’s built-in directives to manage forms, lists, styles, and what users see.

What is test bed in Jasmine?

TestBed is a mock environment to run Angular2 component tests without the browser.

What is directive in Angular with example?

Angular directives can be classified into three types: Component Directives: It forms the main class and is declared by @Component. It contains the details on component processing, instantiated and usage at run time. Example: It contains certain parameters some of them are shown in this example.

How do you mock a directive?

A mock directive in Angular tests can be created by MockDirective function. The mock directive has the same interface as its original directive, but all its methods are dummies. In order to create a mock directive, pass the original directive into MockDirective function.

What is fixture DebugElement?

DebugElement is an Angular class that contains all kinds of references and methods relevant to investigate an element as well as component fixture.debugElement.query(By.css(‘#shan’))

How many types of directives are there?

There are three kinds of directives in Angular: Components—directives with a template. Structural directives—change the DOM layout by adding and removing DOM elements. Attribute directives—change the appearance or behavior of an element, component, or another directive.

What are decorators and directives in Angular?

In Angular, a Directive is essentially a typescript class which has been annotated with a TypeScript Decorator. The decorator is the @ symbol. Decorators are not currently part of the JavaScript functionality (although they likely will be in the future) and are also still experimental in TypeScript.

What is test bedding?

A testbed (also spelled test bed) is a platform for conducting rigorous, transparent, and replicable testing of scientific theories, computational tools, and new technologies. The term is used across many disciplines to describe experimental research and new product development platforms and environments.

What is TestBed setup?

Test Bed Configuration: It is the combination of hardware and software environment on which the tests will be executed. It includes hardware configuration, operating system settings, software configuration, test terminals and other support to perform the test.

What is directive and component in Angular?

Angular components are the major UI building blocks of an Angular application, and the Angular components are a subset of Directives and Angular component are always associated with a template i.e. Angular Components have their own view whereas Angular Directives are used to add additional behavior to an existing DOM …

Why component is a directive?

A component is a directive used to shadow DOM to create and encapsulate visual behavior called components. They are typically used to create UI widgets. A Directive is usually used while adding behavior to an existing DOM element. For registering a component, we use @Component metadata annotation attributes.