What is the difference between a unit test and a component test in an Angular app?

A unit test checks a small, isolated piece of logic, like a single function or service method, completely on its own, often without needing Angular's TestBed at all. A component test renders an actual component using TestBed and checks that it behaves correctly, often simulating user interactions like clicks, giving you confidence that the component works as a whole.

// Unit test, testing a plain function, no TestBed needed
it('formats price correctly', () => {
  expect(formatPrice(9.5)).toBe('$9.50');
});

// Component test, testing a full rendered component using TestBed
it('displays formatted price', () => {
  fixture.detectChanges();
  expect(fixture.nativeElement.textContent).toContain('$9.50');
});