@vergiss/chooks/lib/hooks/useMount/__tests__/index.test.js

React hooks library

"use strict";

import "core-js/modules/es.object.define-property";
Object.defineProperty(exports, "__esModule", {
  value: true
});

var react_hooks_1 = require("@testing-library/react-hooks");

var index_1 = require("../index");

describe('useMount', function () {
  it('should be defined', function () {
    expect(index_1.useMount).toBeDefined();
  });
  it('should invoke the callback only once', function () {
    var callback = jest.fn();
    var hook = react_hooks_1.renderHook(function () {
      return index_1.useMount(callback);
    });
    expect(callback).toBeCalledTimes(1);
    react_hooks_1.act(function () {
      hook.rerender();
    });
    expect(callback).toBeCalledTimes(1);
    react_hooks_1.act(function () {
      hook.unmount();
    });
    expect(callback).toBeCalledTimes(1);
  });
});