Testing NumericTextBox with Enzyme and Jest

    it('should fire onChange event once and with correct value', () => {
        let c = 0;
        let val: number = 0;
        const onChange = (e: any) => { c++; val = e.value; };
        const wraped = mount(<NumericTextBox onChange={onChange} />);
        const numeric = wraped.find(NumericTextBox);
        const input = numeric.find('input');
        const el = (input.getDOMNode() as HTMLInputElement);
        el.value = '27';
        el.selectionStart = 2;
        el.selectionEnd = 2;
        input.simulate('change');
        expect(c).toBe(1);
        expect(val).toBe(27);
    });