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| 1 | +import { act, cleanup, fireEvent, render, screen } from "@testing-library/react"; |
| 2 | +import { afterEach, describe, expect, it, vi } from "vitest"; |
| 3 | +import { ThemeProvider, useTheme } from "@/lib/theme"; |
| 4 | + |
| 5 | +function mockMatchMedia(matches = false) { |
| 6 | + window.matchMedia = vi.fn().mockImplementation((query: string) => ({ |
| 7 | + matches, |
| 8 | + media: query, |
| 9 | + onchange: null, |
| 10 | + addListener: vi.fn(), |
| 11 | + removeListener: vi.fn(), |
| 12 | + addEventListener: vi.fn(), |
| 13 | + removeEventListener: vi.fn(), |
| 14 | + dispatchEvent: vi.fn(), |
| 15 | + })); |
| 16 | +} |
| 17 | + |
| 18 | +function ThemeHarness() { |
| 19 | + const { theme, resolvedTheme, setTheme } = useTheme(); |
| 20 | + |
| 21 | + return ( |
| 22 | + <> |
| 23 | + <span data-testid="theme">{theme}</span> |
| 24 | + <span data-testid="resolved-theme">{resolvedTheme}</span> |
| 25 | + <button onClick={() => setTheme("light")}>light</button> |
| 26 | + <button onClick={() => setTheme("dark")}>dark</button> |
| 27 | + <button onClick={() => setTheme("system")}>system</button> |
| 28 | + </> |
| 29 | + ); |
| 30 | +} |
| 31 | + |
| 32 | +afterEach(() => { |
| 33 | + cleanup(); |
| 34 | + localStorage.clear(); |
| 35 | + document.documentElement.className = ""; |
| 36 | + delete document.documentElement.dataset.theme; |
| 37 | + document.documentElement.style.colorScheme = ""; |
| 38 | + vi.restoreAllMocks(); |
| 39 | + mockMatchMedia(false); |
| 40 | +}); |
| 41 | + |
| 42 | +describe("ThemeProvider", () => { |
| 43 | + it("applies the stored theme on mount", () => { |
| 44 | + mockMatchMedia(false); |
| 45 | + localStorage.setItem("test-theme", "dark"); |
| 46 | + |
| 47 | + render( |
| 48 | + <ThemeProvider storageKey="test-theme"> |
| 49 | + <ThemeHarness /> |
| 50 | + </ThemeProvider> |
| 51 | + ); |
| 52 | + |
| 53 | + expect(screen.getByTestId("theme")).toHaveTextContent("dark"); |
| 54 | + expect(screen.getByTestId("resolved-theme")).toHaveTextContent("dark"); |
| 55 | + expect(document.documentElement).toHaveClass("dark"); |
| 56 | + expect(document.documentElement.dataset.theme).toBe("dark"); |
| 57 | + }); |
| 58 | + |
| 59 | + it("writes to localStorage only when the active window changes theme", () => { |
| 60 | + mockMatchMedia(false); |
| 61 | + const setItemSpy = vi.spyOn(Storage.prototype, "setItem"); |
| 62 | + const emitSpy = vi.spyOn(window.__TAURI__.event, "emit"); |
| 63 | + |
| 64 | + render( |
| 65 | + <ThemeProvider storageKey="test-theme"> |
| 66 | + <ThemeHarness /> |
| 67 | + </ThemeProvider> |
| 68 | + ); |
| 69 | + |
| 70 | + fireEvent.click(screen.getByRole("button", { name: "dark" })); |
| 71 | + |
| 72 | + expect(setItemSpy).toHaveBeenCalledTimes(1); |
| 73 | + expect(setItemSpy).toHaveBeenCalledWith("test-theme", "dark"); |
| 74 | + expect(emitSpy).toHaveBeenCalledWith("theme-changed", "dark"); |
| 75 | + expect(document.documentElement).toHaveClass("dark"); |
| 76 | + }); |
| 77 | + |
| 78 | + it("reacts to storage sync without echo-writing the same key", () => { |
| 79 | + mockMatchMedia(false); |
| 80 | + const setItemSpy = vi.spyOn(Storage.prototype, "setItem"); |
| 81 | + const emitSpy = vi.spyOn(window.__TAURI__.event, "emit"); |
| 82 | + |
| 83 | + render( |
| 84 | + <ThemeProvider storageKey="test-theme"> |
| 85 | + <ThemeHarness /> |
| 86 | + </ThemeProvider> |
| 87 | + ); |
| 88 | + |
| 89 | + setItemSpy.mockClear(); |
| 90 | + emitSpy.mockClear(); |
| 91 | + |
| 92 | + act(() => { |
| 93 | + window.dispatchEvent( |
| 94 | + new StorageEvent("storage", { |
| 95 | + key: "test-theme", |
| 96 | + newValue: "dark", |
| 97 | + }) |
| 98 | + ); |
| 99 | + }); |
| 100 | + |
| 101 | + expect(screen.getByTestId("theme")).toHaveTextContent("dark"); |
| 102 | + expect(screen.getByTestId("resolved-theme")).toHaveTextContent("dark"); |
| 103 | + expect(document.documentElement).toHaveClass("dark"); |
| 104 | + expect(setItemSpy).not.toHaveBeenCalled(); |
| 105 | + expect(emitSpy).not.toHaveBeenCalled(); |
| 106 | + }); |
| 107 | + |
| 108 | + it("tracks system appearance changes while the preference is system", () => { |
| 109 | + let listener: (() => void) | null = null; |
| 110 | + let matches = false; |
| 111 | + |
| 112 | + window.matchMedia = vi.fn().mockImplementation(() => ({ |
| 113 | + get matches() { |
| 114 | + return matches; |
| 115 | + }, |
| 116 | + media: "(prefers-color-scheme: dark)", |
| 117 | + onchange: null, |
| 118 | + addListener: vi.fn((fn: () => void) => { |
| 119 | + listener = fn; |
| 120 | + }), |
| 121 | + removeListener: vi.fn(), |
| 122 | + addEventListener: vi.fn((_: string, fn: () => void) => { |
| 123 | + listener = fn; |
| 124 | + }), |
| 125 | + removeEventListener: vi.fn(), |
| 126 | + dispatchEvent: vi.fn(), |
| 127 | + })); |
| 128 | + |
| 129 | + render( |
| 130 | + <ThemeProvider storageKey="test-theme" defaultTheme="system"> |
| 131 | + <ThemeHarness /> |
| 132 | + </ThemeProvider> |
| 133 | + ); |
| 134 | + |
| 135 | + expect(screen.getByTestId("resolved-theme")).toHaveTextContent("light"); |
| 136 | + |
| 137 | + matches = true; |
| 138 | + act(() => { |
| 139 | + listener?.(); |
| 140 | + }); |
| 141 | + |
| 142 | + expect(screen.getByTestId("theme")).toHaveTextContent("system"); |
| 143 | + expect(screen.getByTestId("resolved-theme")).toHaveTextContent("dark"); |
| 144 | + expect(document.documentElement).toHaveClass("dark"); |
| 145 | + }); |
| 146 | +}); |
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