bc518174
 王天杨
提交两个项目文件
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import { addMonths, isSameMonth } from 'date-fns';
import { getPreviousMonth } from './getPreviousMonth';
const startingMonth = new Date(2020, 4, 31);
describe('when number of months is 1', () => {
describe('when the navigation is disabled', () => {
const disableNavigation = true;
it('the previous month is undefined', () => {
const result = getPreviousMonth(startingMonth, { disableNavigation });
expect(result).toBe(undefined);
});
});
describe('when in the navigable range', () => {
const fromDate = addMonths(startingMonth, -3);
it('the previous month is not undefined', () => {
const result = getPreviousMonth(startingMonth, { fromDate });
const expectedPrevMonth = addMonths(startingMonth, -1);
expect(result && isSameMonth(result, expectedPrevMonth)).toBeTruthy();
});
});
describe('when not in the navigable range', () => {
const fromDate = startingMonth;
it('the previous month is undefined', () => {
const result = getPreviousMonth(startingMonth, { fromDate });
expect(result).toBe(undefined);
});
});
});
describe('when displaying 3 months', () => {
const numberOfMonths = 3;
describe('when the navigation is paged', () => {
const pagedNavigation = true;
it('the previous month is 3 months back', () => {
const result = getPreviousMonth(startingMonth, {
numberOfMonths,
pagedNavigation
});
const expectedPrevMonth = addMonths(startingMonth, -numberOfMonths);
expect(result && isSameMonth(result, expectedPrevMonth)).toBeTruthy();
});
});
describe('when the navigation is not paged', () => {
const pagedNavigation = false;
it('the previous month is 1 months back', () => {
const result = getPreviousMonth(startingMonth, {
numberOfMonths,
pagedNavigation
});
const expectedPrevMonth = addMonths(startingMonth, -1);
expect(result && isSameMonth(result, expectedPrevMonth)).toBeTruthy();
});
});
});
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