To allow any element add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. in Angular 4

Question

I created a new project with angular-cli (ng new my-project-name)

When I run npm run test it run without any failures.

I added font-awsome module(https://www.npmjs.com/package/angular-font-awesome) in my project to display font icons.

In my html file added <fa name="bars"></fa> tag and got output as expected. If I run npm run test again it is ending with 3 failures, all of them are targeting fa tag.

Here is sample failure report

'fa' is not a known element:
        1. If 'fa' is an Angular component, then verify that it is part of this module.
        2. To allow any element add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. ("--The content below is only a placeholder and can be replaced.-->
        <div style="text-align:center">          [ERROR ->]<fa name="bars"></fa>
          <h1>            Welcome to {{title}}!
        "): ng:///DynamicTestModule/AppComponent.html@2:2        Error: Template parse errors:
            at syntaxError home/harsha/Documents/Projects/testProject/node_modules/@angular/compiler/esm5/compiler.js:466:22)

I tried some fixes like adding NO_ERRORS_SCHEMA, CUSTOM_ELEMENTS_SCHEMA in app.module.ts file.

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AngularFontAwesomeModule
  ],
  providers: [],
  bootstrap: [AppComponent],
  schemas: [
    CUSTOM_ELEMENTS_SCHEMA,
    NO_ERRORS_SCHEMA
  ]
})`

But nothing worked.

Answer 1

In your test spec file it needs to be set up like this:

beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ yourcomponent ],
      schemas: [NO_ERRORS_SCHEMA]
    })
    .compileComponents();
  }));

Notice the schemas property in the TestBed.configureTestingModule method. After setting the schemas property your tests should run without error as before you added Font Awsome component.