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| 1 | +import { renderHook } from "@testing-library/react"; |
| 2 | +import { useIsMobile } from "./useIsMobile"; |
| 3 | + |
| 4 | +// Mock window.matchMedia |
| 5 | +const mockMatchMedia = jest.fn(); |
| 6 | +Object.defineProperty(window, "matchMedia", { |
| 7 | + writable: true, |
| 8 | + value: mockMatchMedia, |
| 9 | +}); |
| 10 | + |
| 11 | +describe("useIsMobile", () => { |
| 12 | + beforeEach(() => { |
| 13 | + mockMatchMedia.mockClear(); |
| 14 | + }); |
| 15 | + |
| 16 | + it("returns true for mobile viewport widths", () => { |
| 17 | + const mockMediaQuery = { |
| 18 | + matches: true, |
| 19 | + addEventListener: jest.fn(), |
| 20 | + removeEventListener: jest.fn(), |
| 21 | + }; |
| 22 | + mockMatchMedia.mockReturnValue(mockMediaQuery); |
| 23 | + |
| 24 | + const { result } = renderHook(() => useIsMobile()); |
| 25 | + |
| 26 | + expect(result.current).toBe(true); |
| 27 | + expect(mockMatchMedia).toHaveBeenCalledWith("(max-width: 768px)"); |
| 28 | + }); |
| 29 | + |
| 30 | + it("returns false for desktop viewport widths", () => { |
| 31 | + const mockMediaQuery = { |
| 32 | + matches: false, |
| 33 | + addEventListener: jest.fn(), |
| 34 | + removeEventListener: jest.fn(), |
| 35 | + }; |
| 36 | + mockMatchMedia.mockReturnValue(mockMediaQuery); |
| 37 | + |
| 38 | + const { result } = renderHook(() => useIsMobile()); |
| 39 | + |
| 40 | + expect(result.current).toBe(false); |
| 41 | + expect(mockMatchMedia).toHaveBeenCalledWith("(max-width: 768px)"); |
| 42 | + }); |
| 43 | + |
| 44 | + it("responds to viewport changes", () => { |
| 45 | + let changeHandler: (() => void) | null = null; |
| 46 | + const mockMediaQuery = { |
| 47 | + matches: false, |
| 48 | + addEventListener: jest.fn((event, handler) => { |
| 49 | + if (event === "change") { |
| 50 | + changeHandler = handler; |
| 51 | + } |
| 52 | + }), |
| 53 | + removeEventListener: jest.fn(), |
| 54 | + }; |
| 55 | + mockMatchMedia.mockReturnValue(mockMediaQuery); |
| 56 | + |
| 57 | + const { result, rerender } = renderHook(() => useIsMobile()); |
| 58 | + |
| 59 | + expect(result.current).toBe(false); |
| 60 | + |
| 61 | + // Simulate viewport change to mobile |
| 62 | + mockMediaQuery.matches = true; |
| 63 | + if (changeHandler) { |
| 64 | + changeHandler(); |
| 65 | + } |
| 66 | + rerender(); |
| 67 | + |
| 68 | + expect(result.current).toBe(true); |
| 69 | + |
| 70 | + // Simulate viewport change back to desktop |
| 71 | + mockMediaQuery.matches = false; |
| 72 | + if (changeHandler) { |
| 73 | + changeHandler(); |
| 74 | + } |
| 75 | + rerender(); |
| 76 | + |
| 77 | + expect(result.current).toBe(false); |
| 78 | + }); |
| 79 | + |
| 80 | + it("cleans up event listener on unmount", () => { |
| 81 | + const mockRemoveEventListener = jest.fn(); |
| 82 | + const mockMediaQuery = { |
| 83 | + matches: false, |
| 84 | + addEventListener: jest.fn(), |
| 85 | + removeEventListener: mockRemoveEventListener, |
| 86 | + }; |
| 87 | + mockMatchMedia.mockReturnValue(mockMediaQuery); |
| 88 | + |
| 89 | + const { unmount } = renderHook(() => useIsMobile()); |
| 90 | + |
| 91 | + unmount(); |
| 92 | + |
| 93 | + expect(mockRemoveEventListener).toHaveBeenCalledWith( |
| 94 | + "change", |
| 95 | + expect.any(Function), |
| 96 | + ); |
| 97 | + }); |
| 98 | +}); |
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