"describe" vs "test"

"describe" and "test" are both functions provided by the Jest testing framework, but they serve slightly different purposes:

test: This function is used to define a single test case. It takes two arguments: a string describing the test case, and a callback function which contains the actual testing code. Here's an example:

test('adds 1 + 2 to equal 3', () => {
  expect(1 + 2).toBe(3);
});

describe: This function is used to group related tests together. It also takes two arguments: a string describing the group, and a callback function which contains the actual tests (usually test or it functions). Here's an example:

describe('mathematical operations', () => {
  test('adds 1 + 2 to equal 3', () => {
    expect(1 + 2).toBe(3);
  });

  test('subtracts 5 - 2 to equal 3', () => {
    expect(5 - 2).toBe(3);
  });
});