axios/test/specs/utils/isX.spec.js

import utils from '../../../lib/utils';

describe('utils::isX', function () {
  it('should validate Array', function () {
    expect(utils.isArray([])).toEqual(true);
    expect(utils.isArray({ length: 5 })).toEqual(false);
  });

  it('should validate ArrayBuffer', function () {
    expect(utils.isArrayBuffer(new ArrayBuffer(2))).toEqual(true);
    expect(utils.isArrayBuffer({})).toEqual(false);
  });

  it('should validate ArrayBufferView', function () {
    expect(utils.isArrayBufferView(new DataView(new ArrayBuffer(2)))).toEqual(true);
  });

  it('should validate FormData', function () {
    expect(utils.isFormData(new FormData())).toEqual(true);
  });

  it('should validate Blob', function () {
    expect(utils.isBlob(new Blob())).toEqual(true);
  });

  it('should validate String', function () {
    expect(utils.isString('')).toEqual(true);
    expect(
      utils.isString({
        toString: function () {
          return '';
        },
      })
    ).toEqual(false);
  });

  it('should validate Number', function () {
    expect(utils.isNumber(123)).toEqual(true);
    expect(utils.isNumber('123')).toEqual(false);
  });

  it('should validate Undefined', function () {
    expect(utils.isUndefined()).toEqual(true);
    expect(utils.isUndefined(null)).toEqual(false);
  });

  it('should validate Object', function () {
    expect(utils.isObject({})).toEqual(true);
    expect(utils.isObject([])).toEqual(true);
    expect(utils.isObject(null)).toEqual(false);
  });

  it('should validate plain Object', function () {
    expect(utils.isPlainObject({})).toEqual(true);
    expect(utils.isPlainObject([])).toEqual(false);
    expect(utils.isPlainObject(null)).toEqual(false);
    expect(utils.isPlainObject(Object.create({}))).toEqual(false);
  });

  it('should validate Date', function () {
    expect(utils.isDate(new Date())).toEqual(true);
    expect(utils.isDate(Date.now())).toEqual(false);
  });

  it('should validate Function', function () {
    expect(utils.isFunction(function () {})).toEqual(true);
    expect(utils.isFunction('function')).toEqual(false);
  });

  it('should validate URLSearchParams', function () {
    expect(utils.isURLSearchParams(new URLSearchParams())).toEqual(true);
    expect(utils.isURLSearchParams('foo=1&bar=2')).toEqual(false);
  });

  it('should validate TypedArray instance', function () {
    expect(utils.isTypedArray(new Uint8Array([1, 2, 3]))).toEqual(true);
    expect(utils.isTypedArray([1, 2, 3])).toEqual(false);
  });
});