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Diffstat (limited to 'spec/frontend/lib/utils/sticky_spec.js')
-rw-r--r-- | spec/frontend/lib/utils/sticky_spec.js | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/spec/frontend/lib/utils/sticky_spec.js b/spec/frontend/lib/utils/sticky_spec.js new file mode 100644 index 00000000000..4ad68cc9ff6 --- /dev/null +++ b/spec/frontend/lib/utils/sticky_spec.js @@ -0,0 +1,77 @@ +import { isSticky } from '~/lib/utils/sticky'; +import { setHTMLFixture } from 'helpers/fixtures'; + +const TEST_OFFSET_TOP = 500; + +describe('sticky', () => { + let el; + let offsetTop; + + beforeEach(() => { + setHTMLFixture( + ` + <div class="parent"> + <div id="js-sticky"></div> + </div> + `, + ); + + offsetTop = TEST_OFFSET_TOP; + el = document.getElementById('js-sticky'); + Object.defineProperty(el, 'offsetTop', { + get() { + return offsetTop; + }, + }); + }); + + afterEach(() => { + el = null; + }); + + describe('when stuck', () => { + it('does not remove is-stuck class', () => { + isSticky(el, 0, el.offsetTop); + isSticky(el, 0, el.offsetTop); + + expect(el.classList.contains('is-stuck')).toBeTruthy(); + }); + + it('adds is-stuck class', () => { + isSticky(el, 0, el.offsetTop); + + expect(el.classList.contains('is-stuck')).toBeTruthy(); + }); + + it('inserts placeholder element', () => { + isSticky(el, 0, el.offsetTop, true); + + expect(document.querySelector('.sticky-placeholder')).not.toBeNull(); + }); + }); + + describe('when not stuck', () => { + it('removes is-stuck class', () => { + jest.spyOn(el.classList, 'remove'); + + isSticky(el, 0, el.offsetTop); + isSticky(el, 0, 0); + + expect(el.classList.remove).toHaveBeenCalledWith('is-stuck'); + expect(el.classList.contains('is-stuck')).toBe(false); + }); + + it('does not add is-stuck class', () => { + isSticky(el, 0, 0); + + expect(el.classList.contains('is-stuck')).toBeFalsy(); + }); + + it('removes placeholder', () => { + isSticky(el, 0, el.offsetTop, true); + isSticky(el, 0, 0, true); + + expect(document.querySelector('.sticky-placeholder')).toBeNull(); + }); + }); +}); |