@types/jasmine

Describing test suites

This feature allows you to group together related tests into a test suite. Each suite starts with a call to the global Jasmine function `describe` with two parameters: a string and a function. The string is the title of the test suite, and the function is the block of code that implements the suite.

describe('A suite', () => {
  it('contains spec with an expectation', () => {
    expect(true).toBe(true);
  });
});

Writing test specifications

This feature is used to write individual test cases or specifications. The `it` function takes a string describing the test and a function that contains the test's code. The `expect` function is used to make an assertion about the expected outcome of the test.

it('is true', () => {
  expect(true).toBe(true);
});

Setting up and tearing down

This feature allows you to define setup (`beforeEach`) and teardown (`afterEach`) methods that are called before and after each test spec in a suite, respectively. This is useful for creating a clean environment for each test to run in.

describe('A suite', () => {
  beforeEach(() => {
    // Setup code here
  });

  afterEach(() => {
    // Teardown code here
  });

  it('test case', () => {
    // Test code here
  });
});

Asynchronous support

This feature allows you to test asynchronous code. You can pass a `done` callback to the `it` function and call it when your asynchronous code has completed. This signals to Jasmine that the test should wait for the asynchronous code to finish before considering the test complete.

it('async test', (done) => {
  setTimeout(() => {
    expect(true).toBe(true);
    done();
  }, 1000);
});