[英]Jasmine Unit Test Abstract class
Is there a way to create a jasmine unit test for an abstract component?有没有办法为抽象组件创建茉莉花单元测试?
doing正在做
const fixture = TestBed.createComponent(MyAbstractComponent);
says, "cannot assign an abstract constructor type to a non-abstract constructor type"说,“不能将抽象构造函数类型分配给非抽象构造函数类型”
I tried some searching but nothing comes up.我尝试了一些搜索,但没有任何结果。
You can create a simple class in your test file which extends from abstract class (do not forget to mock abstract methods), than just test its non abstract methods.您可以在测试文件中创建一个从抽象类扩展而来的简单类(不要忘记模拟抽象方法),而不仅仅是测试其非抽象方法。 Let's say we have
MyAbstractClass
:假设我们有
MyAbstractClass
:
export abstract class MyAbstractClass {
sum(a: number, b: number): number {
return a + b;
}
abstract calc1(): void;
abstract calc2(): void;
}
and then in spec file we can just create a new derived class:然后在规范文件中我们可以创建一个新的派生类:
class MyClass extends MyAbstractClass {
// just mock any abstract method
calc1(): void {
return;
}
calc2(): void {
return;
}
}
So now we can write tests for non-abstract methods:所以现在我们可以为非抽象方法编写测试:
describe('MyAbstractClass', () => {
let myClass: MyClass;
beforeEach(() => {
myClass = new MyClass();
});
it('sum two args', () => {
const a = 1, b = 2;
const sum = myClass.sum(a, b);
expect(sum).toBe(3);
});
});
Also created a stackblitz example of this test example.还创建了此测试示例的stackblitz示例。
Here is what I did to test an angular pipe SafePipe
that was using a built in abstract class DomSanitizer
.这是我为测试使用内置抽象类
DomSanitizer
的角管SafePipe
DomSanitizer
。
// 1. Import the pipe/component to be tested import { SafePipe } from './safe.pipe'; // 2. Import the abstract class import { DomSanitizer } from '@angular/platform-browser'; // 3. Important step - create a mock class which extends // from the base class imported above and add implement // the mock methods class MockDomSanitizer extends DomSanitizer { sanitize(): string{ return 'ANY'; } bypassSecurityTrustHtml(): string{ return 'ANY' } bypassSecurityTrustStyle(): string{ return 'ANY' } bypassSecurityTrustScript(): string{ return 'ANY' } bypassSecurityTrustUrl(): string{ return 'ANY' } bypassSecurityTrustResourceUrl(): string{ return 'ANY' } } describe('SafePipe', () => { it('should return an HTML string', () => { // 4. create an instance of pipe class and inject the mocked class above let safePipe = new SafePipe(new MockDomSanitizer()); // 5. Add your asserions as ususal expect(safePipe.transform(null, 'html')).toBeTruthy(); expect(safePipe.transform(null, 'style')).toBeTruthy(); expect(safePipe.transform(null, 'script')).toBeTruthy(); expect(safePipe.transform(null, 'url')).toBeTruthy(); expect(safePipe.transform(null, 'resourceUrl')).toBeTruthy(); expect(safePipe.transform(null, 'anything')).toContain('anything'); }); });
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.