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| 1 | +import { act, render, screen } from "@testing-library/react"; |
| 2 | +import { afterEach, beforeEach, describe, expect, it, vi } from "vitest"; |
| 3 | +import { useViewport } from "./use-viewport"; |
| 4 | + |
| 5 | +type MediaListener = () => void; |
| 6 | + |
| 7 | +const VIEWPORT_QUERY = "(max-width: 899px), (pointer: coarse)"; |
| 8 | + |
| 9 | +const createMatchMediaHarness = (initialMatches: boolean) => { |
| 10 | + let matches = initialMatches; |
| 11 | + const listeners = new Set<MediaListener>(); |
| 12 | + |
| 13 | + const matchMedia = vi.fn((query: string) => ({ |
| 14 | + matches, |
| 15 | + media: query, |
| 16 | + addEventListener: (_event: string, listener: MediaListener) => { |
| 17 | + listeners.add(listener); |
| 18 | + }, |
| 19 | + removeEventListener: (_event: string, listener: MediaListener) => { |
| 20 | + listeners.delete(listener); |
| 21 | + }, |
| 22 | + addListener: (listener: MediaListener) => { |
| 23 | + listeners.add(listener); |
| 24 | + }, |
| 25 | + removeListener: (listener: MediaListener) => { |
| 26 | + listeners.delete(listener); |
| 27 | + }, |
| 28 | + dispatchEvent: () => true, |
| 29 | + })); |
| 30 | + |
| 31 | + return { |
| 32 | + matchMedia, |
| 33 | + setMatches(nextMatches: boolean) { |
| 34 | + matches = nextMatches; |
| 35 | + for (const listener of listeners) { |
| 36 | + listener(); |
| 37 | + } |
| 38 | + }, |
| 39 | + }; |
| 40 | +}; |
| 41 | + |
| 42 | +const Probe = () => { |
| 43 | + return <div data-testid="viewport">{useViewport()}</div>; |
| 44 | +}; |
| 45 | + |
| 46 | +describe("useViewport", () => { |
| 47 | + let originalMatchMedia: typeof window.matchMedia; |
| 48 | + |
| 49 | + beforeEach(() => { |
| 50 | + originalMatchMedia = window.matchMedia; |
| 51 | + }); |
| 52 | + |
| 53 | + afterEach(() => { |
| 54 | + window.matchMedia = originalMatchMedia; |
| 55 | + }); |
| 56 | + |
| 57 | + it("returns desktop when the combined viewport query does not match", () => { |
| 58 | + const harness = createMatchMediaHarness(false); |
| 59 | + window.matchMedia = harness.matchMedia as unknown as typeof window.matchMedia; |
| 60 | + |
| 61 | + render(<Probe />); |
| 62 | + |
| 63 | + expect(window.matchMedia).toHaveBeenCalledWith(VIEWPORT_QUERY); |
| 64 | + expect(screen.getByTestId("viewport")).toHaveTextContent("desktop"); |
| 65 | + }); |
| 66 | + |
| 67 | + it("returns mobile when the combined viewport query matches", () => { |
| 68 | + const harness = createMatchMediaHarness(true); |
| 69 | + window.matchMedia = harness.matchMedia as unknown as typeof window.matchMedia; |
| 70 | + |
| 71 | + render(<Probe />); |
| 72 | + |
| 73 | + expect(screen.getByTestId("viewport")).toHaveTextContent("mobile"); |
| 74 | + }); |
| 75 | + |
| 76 | + it("updates when the media query match changes", () => { |
| 77 | + const harness = createMatchMediaHarness(false); |
| 78 | + window.matchMedia = harness.matchMedia as unknown as typeof window.matchMedia; |
| 79 | + |
| 80 | + render(<Probe />); |
| 81 | + expect(screen.getByTestId("viewport")).toHaveTextContent("desktop"); |
| 82 | + |
| 83 | + act(() => { |
| 84 | + harness.setMatches(true); |
| 85 | + }); |
| 86 | + |
| 87 | + expect(screen.getByTestId("viewport")).toHaveTextContent("mobile"); |
| 88 | + }); |
| 89 | + |
| 90 | + it("cleans up listeners on unmount", () => { |
| 91 | + const removeEventListener = vi.fn(); |
| 92 | + const listeners = new Set<MediaListener>(); |
| 93 | + |
| 94 | + window.matchMedia = vi.fn((query: string) => ({ |
| 95 | + matches: false, |
| 96 | + media: query, |
| 97 | + addEventListener: (_event: string, listener: MediaListener) => { |
| 98 | + listeners.add(listener); |
| 99 | + }, |
| 100 | + removeEventListener, |
| 101 | + addListener: (listener: MediaListener) => { |
| 102 | + listeners.add(listener); |
| 103 | + }, |
| 104 | + removeListener: vi.fn(), |
| 105 | + dispatchEvent: () => true, |
| 106 | + })) as unknown as typeof window.matchMedia; |
| 107 | + |
| 108 | + const view = render(<Probe />); |
| 109 | + view.unmount(); |
| 110 | + |
| 111 | + expect(removeEventListener).toHaveBeenCalledWith("change", expect.any(Function)); |
| 112 | + }); |
| 113 | +}); |
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