Vitest's describe() accepts strings, functions and classes

Vitest's describe() function is commonly used with a string to label a test group, like this:

describe("myFunction", () => {
  test("should return true", () => {
    expect(myFunction()).toBe(true);
  });
});

Did you know you can also pass a class or function instead of a string to describe()? Vitest won't execute the function but will use its name as the label for the test group.

//       ↓ Pass a function
describe(myFunction, () => {
  test("should return true", () => {
    expect(myFunction()).toBe(true);
  });
});

This approach works well with React components too (since they are just functions):

describe(Greeting, () => {
  test("should render correctly", () => {
    render(<Greeting />);
    expect(screen.getByText("Hello World")).toBeInTheDocument();
  });
});