feat(phase4): automate admin integration acceptance

src/modules/overseas-master-data/downloadCsv.test.ts

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+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { saveCsv } from './downloadCsv'
+
+describe('saveCsv', () => {
+  beforeEach(() => vi.stubGlobal('URL', { createObjectURL: vi.fn(), revokeObjectURL: vi.fn() }))
+  afterEach(() => { vi.restoreAllMocks(); vi.unstubAllGlobals() })
+
+  it('downloads the provided Blob with the requested file name and always revokes the URL', () => {
+    const blob = new Blob(['id,status\n1,ACTIVE\n'], { type: 'text/csv;charset=UTF-8' })
+    const createObjectURL = vi.mocked(URL.createObjectURL).mockReturnValue('blob:overseas-master-data')
+    const revokeObjectURL = vi.mocked(URL.revokeObjectURL)
+    const click = vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => undefined)
+
+    saveCsv(blob, 'vehicles.csv')
+
+    expect(createObjectURL).toHaveBeenCalledWith(blob)
+    expect(click).toHaveBeenCalledOnce()
+    expect(revokeObjectURL).toHaveBeenCalledWith('blob:overseas-master-data')
+  })
+
+  it('revokes the Blob URL even when the browser click fails', () => {
+    vi.mocked(URL.createObjectURL).mockReturnValue('blob:failed-download')
+    const revokeObjectURL = vi.mocked(URL.revokeObjectURL)
+    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => { throw new Error('browser blocked') })
+
+    expect(() => saveCsv(new Blob(['csv']), 'quotes.csv')).toThrow('browser blocked')
+    expect(revokeObjectURL).toHaveBeenCalledWith('blob:failed-download')
+  })
+})