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113 lines
4.4 KiB
JavaScript
113 lines
4.4 KiB
JavaScript
const DOMElementPool = require ('../src/dom-element-pool')
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describe('DOMElementPool', function () {
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let domElementPool
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beforeEach(() => { domElementPool = new DOMElementPool() })
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it('builds DOM nodes, recycling them when they are freed', function () {
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let elements
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const [div, span1, span2, span3, span4, span5, textNode] = Array.from(elements = [
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domElementPool.buildElement('div', 'foo'),
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domElementPool.buildElement('span'),
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domElementPool.buildElement('span'),
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domElementPool.buildElement('span'),
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domElementPool.buildElement('span'),
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domElementPool.buildElement('span'),
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domElementPool.buildText('Hello world!')
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])
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expect(div.className).toBe('foo')
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div.textContent = 'testing'
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div.style.backgroundColor = 'red'
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div.dataset.foo = 'bar'
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expect(textNode.textContent).toBe('Hello world!')
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div.appendChild(span1)
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span1.appendChild(span2)
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div.appendChild(span3)
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span3.appendChild(span4)
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span4.appendChild(textNode)
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domElementPool.freeElementAndDescendants(div)
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domElementPool.freeElementAndDescendants(span5)
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expect(elements.includes(domElementPool.buildElement('div'))).toBe(true)
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expect(elements.includes(domElementPool.buildElement('span'))).toBe(true)
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expect(elements.includes(domElementPool.buildElement('span'))).toBe(true)
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expect(elements.includes(domElementPool.buildElement('span'))).toBe(true)
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expect(elements.includes(domElementPool.buildElement('span'))).toBe(true)
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expect(elements.includes(domElementPool.buildElement('span'))).toBe(true)
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expect(elements.includes(domElementPool.buildText('another text'))).toBe(true)
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expect(elements.includes(domElementPool.buildElement('div'))).toBe(false)
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expect(elements.includes(domElementPool.buildElement('span'))).toBe(false)
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expect(elements.includes(domElementPool.buildText('unexisting'))).toBe(false)
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expect(div.className).toBe('')
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expect(div.textContent).toBe('')
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expect(div.style.backgroundColor).toBe('')
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expect(div.dataset.foo).toBeUndefined()
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expect(textNode.textContent).toBe('another text')
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})
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it('forgets free nodes after being cleared', function () {
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const span = domElementPool.buildElement('span')
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const div = domElementPool.buildElement('div')
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domElementPool.freeElementAndDescendants(span)
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domElementPool.freeElementAndDescendants(div)
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domElementPool.clear()
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expect(domElementPool.buildElement('span')).not.toBe(span)
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expect(domElementPool.buildElement('div')).not.toBe(div)
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})
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it('does not attempt to free nodes that were not created by the pool', () => {
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let assertionFailure
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atom.onDidFailAssertion((error) => assertionFailure = error)
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const foreignDiv = document.createElement('div')
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const div = domElementPool.buildElement('div')
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div.appendChild(foreignDiv)
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domElementPool.freeElementAndDescendants(div)
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const span = domElementPool.buildElement('span')
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span.appendChild(foreignDiv)
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domElementPool.freeElementAndDescendants(span)
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expect(assertionFailure).toBeUndefined()
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})
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it('fails an assertion when freeing the same element twice', function () {
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let assertionFailure
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atom.onDidFailAssertion((error) => assertionFailure = error)
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const div = domElementPool.buildElement('div')
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div.textContent = 'testing'
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domElementPool.freeElementAndDescendants(div)
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expect(assertionFailure).toBeUndefined()
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domElementPool.freeElementAndDescendants(div)
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expect(assertionFailure.message).toBe('Assertion failed: The element has already been freed!')
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expect(assertionFailure.metadata.content).toBe('<div>testing</div>')
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})
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it('fails an assertion when freeing the same text node twice', function () {
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let assertionFailure
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atom.onDidFailAssertion((error) => assertionFailure = error)
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const node = domElementPool.buildText('testing')
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domElementPool.freeElementAndDescendants(node)
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expect(assertionFailure).toBeUndefined()
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domElementPool.freeElementAndDescendants(node)
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expect(assertionFailure.message).toBe('Assertion failed: The element has already been freed!')
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expect(assertionFailure.metadata.content).toBe('testing')
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})
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it('throws an error when trying to free an invalid element', function () {
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expect(() => domElementPool.freeElementAndDescendants(null)).toThrow()
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expect(() => domElementPool.freeElementAndDescendants(undefined)).toThrow()
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})
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})
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