In order to keep your unit tests running, you will need to import MaterialModule to any component's spec file that uses Angular material:

*.component.spec.ts
...
  beforeEach(
    async(() => {
      TestBed.configureTestingModule({
        ...
        imports: [..., MaterialModule, NoopAnimationsModule],
      }).compileComponents()
    })
  )

You will also need to update any test, including e2e tests, that search for a particular HTML element.

For example, since the app's title, LocalCast Weather, is not in an h1 tag anymore, you must update the spec file to look for it in a span element:

src/app/app.component.spec.ts
expect(compiled.querySelector('span').textContent).toContain('LocalCast Weather')

Similarly, in e2e tests, you will need to update your page object function to retrieve the text from the correct location:

e2e/app.po.ts
getParagraphText() {
  return element(by.css('app-root mat-toolbar span')).getText()
}