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import getScroll from '../getScroll';
describe('getScroll', () => {
it('getScroll target null', () => {
expect(getScroll(null)).toBe(0);
});
it('getScroll window', () => {
const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((x, y) => {
window.pageXOffset = x;
window.pageYOffset = y;
});
window.scrollTo(0, 400);
expect(getScroll(window)).toBe(400);
scrollToSpy.mockRestore();
});
it('getScroll document', () => {
const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((x, y) => {
document.documentElement.scrollLeft = x;
document.documentElement.scrollTop = y;
});
window.scrollTo(0, 400);
expect(getScroll(document)).toBe(400);
scrollToSpy.mockRestore();
});
it('getScroll div', () => {
const div = document.createElement('div');
const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((x, y) => {
div.scrollLeft = x;
div.scrollTop = y;
});
window.scrollTo(0, 400);
expect(getScroll(div)).toBe(400);
scrollToSpy.mockRestore();
});
it('getScroll documentElement', () => {
const div: any = {};
const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((x, y) => {
div.scrollLeft = null;
div.scrollTop = null;
div.documentElement = {};
div.documentElement.scrollLeft = x;
div.documentElement.scrollTop = y;
});
window.scrollTo(0, 400);
expect(getScroll(div)).toBe(400);
scrollToSpy.mockRestore();
});
it('When window is undef, getScroll value is zero', () => {
const spy = jest.spyOn(global, 'window', 'get').mockImplementation(() => undefined as any);
expect(getScroll(null)).toBe(0);
spy.mockRestore();
});
});
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