What is TestBed in Jasmine

I am new to Jasmine with Angular 2, I am frequently working with the TestBed object when writting a Testcase and getting the errorlease call "TestBed.compileComponents" before your test.

How do I solve this error?

@Component({
moduleId:module.id,
selector: 'my-app',
templateUrl: 'app-component.html',

})

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