DatePicker#React does not change “intialDate” when receiving changed props from parent

[BjornBakke]

   it("should change date on new props", () => {
        const { container, getByTestId } = render(<DatePicker initialDate={new Date("02.02.2019")} />);
        render(<DatePicker initialDate={new Date("12.09.2019")} />, { container });

        const input = getByTestId("jkl-datepicker__input");
        expect(input).toHaveProperty("value", "12.09.2019");
    });

testing-library/react-testing-library#65 (comment)

[SercanSercan]

I noticed that Datepicker-react did not have useEffect() for initialDate and hence, it was not updated after re-initialisation of the value. So, this has been fixed. Plus, @piofinn noticed the unit test written above had a bug as well. See his fix below:

`
it("should change date on new props", () => {
// New date takes MM.DD.YYYY values
const { container, getByTestId } = render(<DatePicker initialDate={new Date("02.02.2019")} />);
render(<DatePicker initialDate={new Date("09.12.2019")} />, { container });

    const input = getByTestId("jkl-datepicker__input");

    // Check for date formatted as DD.MM.YYYY
    expect(input).toHaveProperty("value", "12.09.2019");
});

`

Closing the issue.