Having trouble resolving all parameters for the Router in Angular RC 5 during unit testing

Question

Having trouble resolving all parameters for the Router in Angular RC 5 during unit testing

After upgrading to Angular RC 5, I encountered an issue with all components using 'ROUTER_DIRECTIVES'. When attempting to unit test the component, I received the error message 'Can't resolve all parameters for Router: (?, ?, ?, ?, ?, ?, ?)'.

import { inject, addProviders } from '@angular/core/testing';
import { ComponentFixture, TestComponentBuilder } from '@angular/core/testing';
import { Component } from '@angular/core';
import { ROUTER_DIRECTIVES, Router } from '@angular/router';

import { HomeComponent } from './home.component';
import { UserService } from '../_services/user.service';

describe('Component: Home', () => {

  beforeEach(() => {
    addProviders([HomeComponent, UserService, ROUTER_DIRECTIVES, Router]);
  });  

  it('should inject the component', inject([HomeComponent, UserService, ROUTER_DIRECTIVES, Router],
    (component: HomeComponent) => {
      expect(component).toBeTruthy();
      // expect(component.currentUser.firstname).toEqual('Jan');
    }));

The detailed error log is as follows:

     Chrome 52.0.2743 (Windows 10 0.0.0)
   Error: Can't resolve all parameters for Router: (?, ?, ?, ?, ?, ?, ?).
       at new BaseException (webpack:///C:/ng/anbud/~/@angular/compiler/src/facade/exceptions.js:27:0 <- src/test.ts:2943:23)
       at CompileMetadataResolver.getDependenciesMetadata (webpack:///C:/ng/anbud/~/@angular/compiler/src/metadata_resolver.js:551:0 <- src/test.ts:24542:19)
       at CompileMetadataResolver.getTypeMetadata (webpack:///C:/ng/anbud/~/@angular/compiler/src/metadata_resolver.js:448:0 <- src/test.ts:24439:26)
       at webpack:///C:/ng/anbud/~/@angular/compiler/src/metadata_resolver.js:594:0 <- src/test.ts:24585:41
       at Array.forEach (native)
       at CompileMetadataResolver.getProvidersMetadata (webpack:///C:/ng/anbud/~/@angular/compiler/src/metadata_resolver.js:575:0 <- src/test.ts:24566:19)
       at CompileMetadataResolver.getNgModuleMetadata (webpack:///C:/ng/anbud/~/@angular/compiler/src/metadata_resolver.js:305:0 <- src/test.ts:24296:58)
       at RuntimeCompiler._compileComponents (webpack:///C:/ng/anbud/~/@angular/compiler/src/runtime_compiler.js:150:0 <- src/test.ts:37986:47)
       at RuntimeCompiler._compileModuleAndAllComponents (webpack:///C:/ng/anbud/~/@angular/compiler/src/runtime_compiler.js:78:0 <- src/test.ts:37914:37)
       at RuntimeCompiler.compileModuleAndAllComponentsSync (webpack:///C:/ng/anbud/~/@angular/compiler/src/runtime_compiler.js:52:0 <- src/test.ts:37888:21)

Does anyone have any suggestions on how to successfully unit test components with routing in Angular?

javascript unit-testing angular typescript angular2-routing

Answer 1

Answer №1

I successfully resolved the issue with a straightforward solution:

beforeEach(() => addProviders([
    { 
        provide: Router, 
        useClass: class { navigate = jasmine.createSpy("navigate"); }
    }]));

Answer 2

I successfully resolved the issue with a straightforward solution:

beforeEach(() => addProviders([
    { 
        provide: Router, 
        useClass: class { navigate = jasmine.createSpy("navigate"); }
    }]));

Answer 3

Answer №2

I found a solution that worked for me by including the RouterTestingModule.

  import { RouterTestingModule } from '@angular/router/testing';

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        RouterTestingModule
      ],
      declarations: [ HomeComponent ]
    })
    .compileComponents();
  }));

Answer 4

I found a solution that worked for me by including the RouterTestingModule.

  import { RouterTestingModule } from '@angular/router/testing';

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        RouterTestingModule
      ],
      declarations: [ HomeComponent ]
    })
    .compileComponents();
  }));

Answer 5

Answer №3

After encountering an issue in my project, I discovered that having Router in providers and RouterTestingModule in imports was causing a conflict. By adjusting the configuration as shown below, I was able to resolve the problem:

    TestBed.configureTestingModule({
        declarations: [Component],
        imports: [
            RouterTestingModule,             
        ],
        providers: [
         ...         //Remove Router from providers
        ]              

    });

Answer 6

After encountering an issue in my project, I discovered that having Router in providers and RouterTestingModule in imports was causing a conflict. By adjusting the configuration as shown below, I was able to resolve the problem:

    TestBed.configureTestingModule({
        declarations: [Component],
        imports: [
            RouterTestingModule,             
        ],
        providers: [
         ...         //Remove Router from providers
        ]              

    });

Answer 7

Answer №4

After attempting the suggested solutions without success, I decided to turn to the official documentation for guidance. The recommended approach can be found in this link: Testing Routed Components

To start, you'll need to create a stubbed router that mimics the methods your component uses:

class RouterStub {
  navigateByUrl(url: string) {
    return url;
  }
}

Next, when setting up your testing module, remember to include the following configuration:

TestBed.configureTestingModule({
  declarations: [HeaderComponent],
  providers: [
    {provide: Router, useClass: RouterStub}
  ]
});

Answer 8

After attempting the suggested solutions without success, I decided to turn to the official documentation for guidance. The recommended approach can be found in this link: Testing Routed Components

To start, you'll need to create a stubbed router that mimics the methods your component uses:

class RouterStub {
  navigateByUrl(url: string) {
    return url;
  }
}

Next, when setting up your testing module, remember to include the following configuration:

TestBed.configureTestingModule({
  declarations: [HeaderComponent],
  providers: [
    {provide: Router, useClass: RouterStub}
  ]
});

Answer 9

Answer №5

For enhanced navigation capabilities, consider incorporating RouterModule:

import { ROUTER_DIRECTIVES, Router, RouterModule } from '@angular/router';

beforeEach(() => {
        TestBed.configureTestingModule({
            providers: [
                 ...
                {provide: Router, useClass: RouterModule},
        });
    });

Answer 10

For enhanced navigation capabilities, consider incorporating RouterModule:

import { ROUTER_DIRECTIVES, Router, RouterModule } from '@angular/router';

beforeEach(() => {
        TestBed.configureTestingModule({
            providers: [
                 ...
                {provide: Router, useClass: RouterModule},
        });
    });

Answer 11

Answer №6

After some troubleshooting, I discovered that the issue was being caused by the router provided by my internet service provider. I had to disconnect it in order to resolve the problem.

Answer 12

After some troubleshooting, I discovered that the issue was being caused by the router provided by my internet service provider. I had to disconnect it in order to resolve the problem.

Answer 13

Answer №7

I encountered a similar issue where importing RouterTestModule in my imports array, and removing Router/ActivatedRoute from providers along with removing RouterModule from the imports array resolved the problem for me.

Here is what my successful implementation looks like:

import { RouterTestingModule } from '@angular/router/testing';
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { FormsModule } from '@angular/forms';
import { MyAppComponent } from './my-apppp.component';
import { MyAppService } from '../../../services/my-app.service';
import { NO_ERRORS_SCHEMA} from '@angular/core';

 beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ MyAppComponent ],
      schemas:      [NO_ERRORS_SCHEMA],
      imports: [ FormsModule, RouterTestingModule ],
      providers: [ MyAppService ]
    })
    .compileComponents();
  }));

Although there have been numerous comments on this topic already, I wanted to share an updated answer that may be of assistance.

Thank you!

Answer 14

I encountered a similar issue where importing RouterTestModule in my imports array, and removing Router/ActivatedRoute from providers along with removing RouterModule from the imports array resolved the problem for me.

Here is what my successful implementation looks like:

import { RouterTestingModule } from '@angular/router/testing';
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { FormsModule } from '@angular/forms';
import { MyAppComponent } from './my-apppp.component';
import { MyAppService } from '../../../services/my-app.service';
import { NO_ERRORS_SCHEMA} from '@angular/core';

 beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ MyAppComponent ],
      schemas:      [NO_ERRORS_SCHEMA],
      imports: [ FormsModule, RouterTestingModule ],
      providers: [ MyAppService ]
    })
    .compileComponents();
  }));

Although there have been numerous comments on this topic already, I wanted to share an updated answer that may be of assistance.

Thank you!

Answer 15

Answer №8

For the most recent version of Angular 7, I found a solution that worked perfectly for me. I came across this example in the latest angular documentation.

app/dashboard/dashboard.component.spec.ts (using spies)

const routerSpy = jasmine.createSpyObj('Router', ['navigateByUrl']);
const heroServiceSpy = jasmine.createSpyObj('HeroService', ['getHeroes']);

TestBed.configureTestingModule({
  providers: [
    { provide: HeroService, useValue: heroServiceSpy },
    { provide: Router,      useValue: routerSpy }
  ]
})

app/dashboard/dashboard.component.spec.ts (testing navigation)

it('should instruct ROUTER to navigate when hero is clicked', () => {

  heroClick(); // simulate click on first inner <div class="hero">

  // check arguments passed to router.navigateByUrl() spy
  const spy = router.navigateByUrl as jasmine.Spy;
  const navArgs = spy.calls.first().args[0];

  // expect navigation to the ID of the component's first hero
  const id = comp.heroes[0].id;
  expect(navArgs).toBe('/heroes/' + id,
    'should navigate to HeroDetail for the first hero');
});

Answer 16

For the most recent version of Angular 7, I found a solution that worked perfectly for me. I came across this example in the latest angular documentation.

app/dashboard/dashboard.component.spec.ts (using spies)

const routerSpy = jasmine.createSpyObj('Router', ['navigateByUrl']);
const heroServiceSpy = jasmine.createSpyObj('HeroService', ['getHeroes']);

TestBed.configureTestingModule({
  providers: [
    { provide: HeroService, useValue: heroServiceSpy },
    { provide: Router,      useValue: routerSpy }
  ]
})

app/dashboard/dashboard.component.spec.ts (testing navigation)

it('should instruct ROUTER to navigate when hero is clicked', () => {

  heroClick(); // simulate click on first inner <div class="hero">

  // check arguments passed to router.navigateByUrl() spy
  const spy = router.navigateByUrl as jasmine.Spy;
  const navArgs = spy.calls.first().args[0];

  // expect navigation to the ID of the component's first hero
  const id = comp.heroes[0].id;
  expect(navArgs).toBe('/heroes/' + id,
    'should navigate to HeroDetail for the first hero');
});

Having trouble resolving all parameters for the Router in Angular RC 5 during unit testing

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

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