assertsjs/__tests__/Asserts/assertFunction-text.js

ECMA6 Module for Javascript type validations

jest.unmock('./../../src/Asserts');

describe('Asserts.assertFunction tests', () => {
    it('Asserts.assertFunction should return the value', () => {
        const Asserts = require('./../../src/Asserts');
        const aFunction = function (arg) {
            console.log(arg);
        };
        expect(aFunction).toBe(Asserts.assertFunction(aFunction));
    });

    it('Asserts.assertFunction should return an error', () => {
        const Asserts = require('./../../src/Asserts');
        const notFunction = 'Im a string';
        const expectedMessageError = 'Assertion error: function must be provided';
        try {
            Asserts.assertFunction(notFunction);
        } catch (error) {
            expect(expectedMessageError).toBe(error.message);
        }
    });
});