48 lines
1.7 KiB
TypeScript
48 lines
1.7 KiB
TypeScript
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import { downloadJson } from './download'
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describe('downloadJson', () => {
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beforeEach(() => {
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vi.spyOn(URL, 'createObjectURL').mockReturnValue('blob:mock-url')
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vi.spyOn(URL, 'revokeObjectURL').mockImplementation(() => undefined)
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})
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afterEach(() => {
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vi.restoreAllMocks()
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})
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it('creates a blob URL from the JSON data', () => {
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downloadJson({ x: 1 }, 'export.json')
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expect(URL.createObjectURL).toHaveBeenCalledOnce()
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const blob = vi.mocked(URL.createObjectURL).mock.calls[0]?.[0] as Blob
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expect(blob.type).toBe('application/json')
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})
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it('revokes the blob URL after triggering the download', () => {
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downloadJson({ x: 1 }, 'export.json')
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expect(URL.revokeObjectURL).toHaveBeenCalledWith('blob:mock-url')
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})
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it('sets the correct download filename on the anchor', () => {
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const spy = vi.spyOn(document, 'createElement')
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downloadJson({ x: 1 }, 'my-data.json')
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const anchor = spy.mock.results[0]?.value as HTMLAnchorElement
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expect(anchor.download).toBe('my-data.json')
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})
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it('appends and removes the anchor from the document body', () => {
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const appendSpy = vi.spyOn(document.body, 'appendChild')
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const removeSpy = vi.spyOn(document.body, 'removeChild')
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downloadJson({}, 'empty.json')
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expect(appendSpy).toHaveBeenCalledOnce()
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expect(removeSpy).toHaveBeenCalledOnce()
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})
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it('serializes the data as formatted JSON', () => {
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downloadJson({ a: 1, b: [2, 3] }, 'data.json')
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const blob = vi.mocked(URL.createObjectURL).mock.calls[0]?.[0] as Blob
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// Blob is constructed but content can't be read synchronously in jsdom;
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// verifying type and that createObjectURL was called with a Blob is enough.
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expect(blob).toBeInstanceOf(Blob)
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})
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})
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