File size: 5,232 Bytes
3201ca6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | import { describe, expect, it, beforeEach, afterEach, vi } from "vitest";
import { renderHook, act } from "@testing-library/react";
import { useBreakpoint } from "#/hooks/use-breakpoint";
// Helper to set window.innerWidth and dispatch resize event
function setWindowWidth(width: number) {
Object.defineProperty(window, "innerWidth", {
writable: true,
configurable: true,
value: width,
});
window.dispatchEvent(new Event("resize"));
}
describe("useBreakpoint", () => {
const originalInnerWidth = window.innerWidth;
beforeEach(() => {
// Start at a known desktop width
Object.defineProperty(window, "innerWidth", {
writable: true,
configurable: true,
value: 1200,
});
});
afterEach(() => {
Object.defineProperty(window, "innerWidth", {
writable: true,
configurable: true,
value: originalInnerWidth,
});
});
it("returns false (not mobile) when window width is above the breakpoint", () => {
Object.defineProperty(window, "innerWidth", { value: 1200 });
const { result } = renderHook(() => useBreakpoint());
expect(result.current).toBe(false);
});
it("returns true (mobile) when window width is at the breakpoint (1024)", () => {
Object.defineProperty(window, "innerWidth", { value: 1024 });
const { result } = renderHook(() => useBreakpoint());
expect(result.current).toBe(true);
});
it("returns true (mobile) when window width is below the breakpoint", () => {
Object.defineProperty(window, "innerWidth", { value: 800 });
const { result } = renderHook(() => useBreakpoint());
expect(result.current).toBe(true);
});
it("updates from false to true when window resizes below the breakpoint", () => {
Object.defineProperty(window, "innerWidth", { value: 1200 });
const { result } = renderHook(() => useBreakpoint());
expect(result.current).toBe(false);
act(() => {
setWindowWidth(800);
});
expect(result.current).toBe(true);
});
it("updates from true to false when window resizes above the breakpoint", () => {
Object.defineProperty(window, "innerWidth", { value: 800 });
const { result } = renderHook(() => useBreakpoint());
expect(result.current).toBe(true);
act(() => {
setWindowWidth(1200);
});
expect(result.current).toBe(false);
});
it("does NOT trigger re-render when width changes within the desktop range", () => {
Object.defineProperty(window, "innerWidth", { value: 1200 });
const renderCount = vi.fn();
const { result } = renderHook(() => {
renderCount();
return useBreakpoint();
});
expect(result.current).toBe(false);
const initialRenderCount = renderCount.mock.calls.length;
// Resize within desktop range (still above 1024) — should NOT re-render
act(() => {
setWindowWidth(1300);
});
act(() => {
setWindowWidth(1100);
});
act(() => {
setWindowWidth(1025);
});
expect(result.current).toBe(false);
// No additional renders beyond the initial render
expect(renderCount.mock.calls.length).toBe(initialRenderCount);
});
it("does NOT trigger re-render when width changes within the mobile range", () => {
Object.defineProperty(window, "innerWidth", { value: 800 });
const renderCount = vi.fn();
const { result } = renderHook(() => {
renderCount();
return useBreakpoint();
});
expect(result.current).toBe(true);
const initialRenderCount = renderCount.mock.calls.length;
// Resize within mobile range (still at or below 1024) — should NOT re-render
act(() => {
setWindowWidth(600);
});
act(() => {
setWindowWidth(1024);
});
act(() => {
setWindowWidth(900);
});
expect(result.current).toBe(true);
expect(renderCount.mock.calls.length).toBe(initialRenderCount);
});
it("handles rapid resize across the breakpoint without issues", () => {
Object.defineProperty(window, "innerWidth", { value: 1200 });
const { result } = renderHook(() => useBreakpoint());
expect(result.current).toBe(false);
// Rapid toggles across the breakpoint
act(() => {
setWindowWidth(800);
});
expect(result.current).toBe(true);
act(() => {
setWindowWidth(1200);
});
expect(result.current).toBe(false);
act(() => {
setWindowWidth(1024);
});
expect(result.current).toBe(true);
act(() => {
setWindowWidth(1025);
});
expect(result.current).toBe(false);
});
it("cleans up the resize event listener on unmount", () => {
const removeEventListenerSpy = vi.spyOn(window, "removeEventListener");
const { unmount } = renderHook(() => useBreakpoint());
unmount();
expect(removeEventListenerSpy).toHaveBeenCalledWith(
"resize",
expect.any(Function),
);
removeEventListenerSpy.mockRestore();
});
it("accepts a custom breakpoint value", () => {
Object.defineProperty(window, "innerWidth", { value: 768 });
const { result } = renderHook(() => useBreakpoint(768));
expect(result.current).toBe(true);
act(() => {
setWindowWidth(769);
});
expect(result.current).toBe(false);
});
});
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