bc518174
 王天杨
提交两个项目文件
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import { screen } from '@testing-library/react';
import { addMonths, differenceInMonths } from 'date-fns';
import { DayPickerProps } from 'DayPicker';
import { customRender } from 'test/render';
import { user } from 'test/user';
import { freezeBeforeAll } from 'test/utils';
import { MonthsDropdown, MonthsDropdownProps } from './MonthsDropdown';
const today = new Date(2020, 12, 22);
freezeBeforeAll(today);
let root: HTMLDivElement;
let options: HTMLCollectionOf<HTMLOptionElement> | undefined;
let select: HTMLSelectElement | null;
function setup(props: MonthsDropdownProps, dayPickerProps?: DayPickerProps) {
const view = customRender(<MonthsDropdown {...props} />, dayPickerProps);
root = view.container.firstChild as HTMLDivElement;
select = screen.queryByRole('combobox', { name: 'Month:' });
options = select?.getElementsByTagName('option');
}
const props: MonthsDropdownProps = {
displayMonth: today,
onChange: jest.fn()
};
describe('when fromDate and toDate are passed in', () => {
beforeEach(() => {
setup(props, { fromDate: new Date(), toDate: addMonths(new Date(), 1) });
});
test('should render the dropdown element', () => {
expect(root).toMatchSnapshot();
expect(select).toHaveAttribute('name', 'months');
});
});
describe('when "fromDate" is not set', () => {
beforeEach(() => {
setup(props, { fromDate: undefined });
});
test('should return nothing', () => {
expect(root).toBeNull();
});
});
describe('when "toDate" is not set', () => {
beforeEach(() => {
setup(props, { toDate: undefined });
});
test('should return nothing', () => {
expect(root).toBeNull();
});
});
describe('when "fromDate" and "toDate" are in the same year', () => {
const fromDate = new Date(2012, 0, 22);
const toDate = new Date(2012, 10, 22);
beforeEach(() => {
setup(props, { fromDate, toDate });
});
test('should display the months included between the two dates', () => {
expect(options).toHaveLength(differenceInMonths(toDate, fromDate) + 1);
});
test('the first month should be the fromDate month', () => {
expect(options?.[0]).toHaveValue(String(fromDate.getMonth()));
});
test('the last month should be the toMonth month', () => {
expect(options?.[options.length - 1]).toHaveValue(
String(toDate.getMonth())
);
});
});
describe('when "fromDate" and "toDate" are not in the same year', () => {
const fromDate = new Date(2012, 0, 22);
const toDate = new Date(2015, 10, 22);
const displayMonth = new Date(2015, 7, 0);
beforeEach(() => {
setup({ ...props, displayMonth }, { fromDate, toDate });
});
test('should display the 12 months', () => {
expect(options).toHaveLength(12);
});
test('the first month should be January', () => {
expect(options?.[0]).toHaveValue('0');
});
test('the last month should be December', () => {
expect(options?.[options.length - 1]).toHaveValue('11');
});
test('should select the displayed month', () => {
expect(select).toHaveValue(`${displayMonth.getMonth()}`);
});
describe('when the dropdown changes', () => {
beforeEach(async () => {
if (select) await user.selectOptions(select, 'February');
});
test('should fire the "onChange" event handler', () => {
const expectedMonth = new Date(2015, 1, 1);
expect(props.onChange).toHaveBeenCalledWith(expectedMonth);
});
});
});
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