toHaveBeenCalledOnceWith.test.js

import * as matcher from 'src/matchers/toHaveBeenCalledOnceWith';

expect.extend(matcher);

describe('.toHaveBeenCalledOnceWith', () => {
  let mock;
  beforeEach(() => {
    mock = jest.fn();
  });

  test('passes if mock was invoked exactly once with the expected value', () => {
    mock('hello');
    expect(mock).toHaveBeenCalledOnceWith('hello');
  });

  test('passes if mock was invoked exactly once with the expected values in an array', () => {
    mock(['hello', 'there']);
    expect(mock).toHaveBeenCalledOnceWith(['hello', 'there']);
  });

  test('passes if mock was invoked exactly once with the expected values', () => {
    mock('hello', 'there');
    expect(mock).toHaveBeenCalledOnceWith('hello', 'there');
  });

  test('fails if mock was never invoked indicating that it was invoked 0 times', () => {
    expect(() => expect(mock).toHaveBeenCalledOnceWith('hello')).toThrowErrorMatchingSnapshot();
  });

  test('fails if mock was invoked more than once, indicating how many times it was invoked', () => {
    // Invoke mock 17 times
    new Array(17).fill(mock).forEach(e => e(Math.random()));
    expect(() => expect(mock).toHaveBeenCalledOnceWith('hello')).toThrowErrorMatchingSnapshot();
  });

  test('fails when given value is not a jest spy or mock', () => {
    const mock1 = () => {};
    expect(() => expect(mock1).toHaveBeenCalledOnceWith('hello')).toThrowErrorMatchingSnapshot();
  });

  test('fails when given value is not the expected one', () => {
    mock('not hello');
    expect(() => expect(mock).toHaveBeenCalledOnceWith('hello')).toThrowErrorMatchingSnapshot();
  });
});

describe('.not.toHaveBeenCalledOnceWith', () => {
  let mock;
  beforeEach(() => {
    mock = jest.fn();
  });

  test('passes if mock was never invoked', () => {
    expect(mock).not.toHaveBeenCalledOnceWith('hello');
  });

  test('passes if mock was invoked more than once', () => {
    mock('hello');
    mock('hello');
    expect(mock).not.toHaveBeenCalledOnceWith('hello');
  });

  test('fails if mock was invoked exactly once with the expected value', () => {
    mock('hello');
    expect(() => expect(mock).not.toHaveBeenCalledOnceWith('hello')).toThrowErrorMatchingSnapshot();
  });

  test('passes if mock was invoked exactly once without the expected value', () => {
    mock('not hello');
    expect(mock).not.toHaveBeenCalledOnceWith('hello');
  });

  test('passes if mock was invoked exactly once without both expected values in an array', () => {
    mock(['hello', 'there']);
    expect(mock).not.toHaveBeenCalledOnceWith(['hello', 'not there']);
  });

  test('passes if mock was invoked exactly once without both expected values', () => {
    mock('hello', 'there');
    expect(mock).not.toHaveBeenCalledOnceWith('hello', 'not there');
  });
});