Angular Unit Test Case and Test Bed

 Exclude Angular unit test case from Execution

• Case using 'x' keyword we can exclude any test case from execution.

  xit('Show the Addition result',() =>{

expect(Addition(10,20)).toBeGreaterThan(20);

    })

Matchers in angular unit test case

• Matchers are nothing but compare functions to actually compare the expected and actual result in the test specs.
•  Matchers are the JavaScript function that does a Boolean comparison between an actual output and an expected output.
• There are two type of matchers Inbuilt matcher and Custom matchers.

Inbuilt Matcher

• The matchers which are inbuilt in the Jasmine framework are called inbuilt matcher. The user can easily use it implicitly.

TestBed and Component Fixture

• The Angular Test Bed (ATB) is a higher level Angular Only testing framework that allows us to easily test behaviors that depend on the Angular Framework.

• We still write our tests in Jasmine and run using Karm but we now have a slightly easier way to create components, handle injection, test asynchronous behavior and interact with our application.

When to Use ATB

• It allows us to test the interaction of a directive or component with its template.
• It allows us to easily test change detection.
• It provide methods to create components and services for unit test case.
• It allows us to test and use Angular's DI framework.
•  It allows us to test using the NgModule configuration we use in our application.
• It allows us to test user interaction via clicks and input fields