import { afterEach, describe, expect, it, vi } from "vite-plus/test"; function createStorage(overrides: Partial<Storage> = {}): Storage { const store = new Map<string, string>(); return { clear: () => store.clear(), getItem: (key) => store.get(key) ?? null, key: (index) => [...store.keys()][index] ?? null, get length() { return store.size; }, removeItem: (key) => { store.delete(key); }, setItem: (key, value) => { store.set(key, value); }, ...overrides, };} afterEach(() => { vi.doUnmock("react"); vi.resetModules(); vi.restoreAllMocks(); vi.unstubAllGlobals();}); describe("theme failure handling", () => { it("preserves exact storage causes and operation context", async () => { const readCause = new Error("storage read blocked"); const writeCause = new Error("storage quota exceeded"); vi.stubGlobal("window", { localStorage: createStorage({ getItem: () => { throw readCause; }, setItem: () => { throw writeCause; }, }), }); const { readThemePreference, ThemeStorageError, writeThemePreference } = await import("./useTheme"); try { readThemePreference(); expect.unreachable("expected the theme read to fail"); } catch (error) { expect(error).toBeInstanceOf(ThemeStorageError); expect(error).toMatchObject({ operation: "read", storageKey: "t3code:theme", cause: readCause, }); } try { writeThemePreference("dark"); expect.unreachable("expected the theme write to fail"); } catch (error) { expect(error).toBeInstanceOf(ThemeStorageError); expect(error).toMatchObject({ operation: "write", storageKey: "t3code:theme", theme: "dark", cause: writeCause, }); } }); it("reads the persisted T3 Chat theme preference", async () => { vi.stubGlobal("window", { localStorage: createStorage({ getItem: () => "t3-chat", }), }); const { readThemePreference } = await import("./useTheme"); expect(readThemePreference()).toBe("t3-chat"); }); it("falls back during initial theme application and logs only safe attributes", async () => { const cause = new Error("private browsing storage failure"); const errorLog = vi.spyOn(console, "error").mockImplementation(() => {}); vi.stubGlobal("window", { localStorage: createStorage({ getItem: () => { throw cause; }, }), matchMedia: () => ({ matches: false }), }); vi.stubGlobal("document", { documentElement: { classList: { toggle: vi.fn() }, }, }); await expect(import("./useTheme")).resolves.toBeDefined(); expect(errorLog).toHaveBeenCalledWith( "Failed to read theme preference for t3code:theme.", expect.objectContaining({ operation: "read", storageKey: "t3code:theme", errorTag: "ThemeStorageError", }), ); const attributes = errorLog.mock.calls[0]?.[1]; expect(attributes).not.toHaveProperty("cause"); expect(JSON.stringify(attributes)).not.toContain(cause.message); }); it("retries a failed storage read only after a relevant storage event", async () => { const cause = new Error("persistent storage failure"); const themeGetItem = vi.fn((): string | null => { throw cause; }); const getItem = vi.fn((key: string) => (key === "t3code:theme" ? themeGetItem() : null)); const errorLog = vi.spyOn(console, "error").mockImplementation(() => {}); let readSnapshot: (() => unknown) | undefined; let subscribeToTheme: ((listener: () => void) => () => void) | undefined; let storageHandler: ((event: StorageEvent) => void) | undefined; vi.doMock("react", () => ({ useCallback: <A>(callback: A) => callback, useEffect: () => undefined, useSyncExternalStore: ( subscribe: (listener: () => void) => () => void, getSnapshot: () => unknown, ) => { subscribeToTheme = subscribe; readSnapshot = getSnapshot; return getSnapshot(); }, })); vi.stubGlobal("window", { addEventListener: (type: string, listener: (event: StorageEvent) => void) => { if (type === "storage") storageHandler = listener; }, localStorage: createStorage({ getItem }), matchMedia: () => ({ matches: false, addEventListener: () => undefined, removeEventListener: () => undefined, }), removeEventListener: () => undefined, }); const { useTheme } = await import("./useTheme"); useTheme(); readSnapshot?.(); readSnapshot?.(); expect(themeGetItem).toHaveBeenCalledTimes(1); expect(errorLog).toHaveBeenCalledTimes(1); const unsubscribe = subscribeToTheme?.(() => undefined); storageHandler?.({ key: "t3code:theme" } as StorageEvent); readSnapshot?.(); expect(themeGetItem).toHaveBeenCalledTimes(2); expect(errorLog).toHaveBeenCalledTimes(2); unsubscribe?.(); }); it("preserves desktop sync causes and retries after a failed cosmetic sync", async () => { const cause = new Error("desktop IPC unavailable"); const errorLog = vi.spyOn(console, "error").mockImplementation(() => {}); const setTheme = vi.fn().mockRejectedValue(cause); vi.stubGlobal("window", { desktopBridge: { setTheme } }); const { DesktopThemeSyncError, syncDesktopTheme, syncDesktopThemePreference } = await import("./useTheme"); const error = await syncDesktopThemePreference({ setTheme }, "dark").then( () => undefined, (failure: unknown) => failure, ); expect(error).toBeInstanceOf(DesktopThemeSyncError); expect(error).toMatchObject({ theme: "dark", cause }); setTheme.mockClear(); syncDesktopTheme("dark"); await Promise.resolve(); await Promise.resolve(); syncDesktopTheme("dark"); await Promise.resolve(); await Promise.resolve(); expect(setTheme).toHaveBeenCalledTimes(2); expect(errorLog).toHaveBeenCalledWith( "Failed to sync the dark theme to the desktop shell.", expect.objectContaining({ theme: "dark", errorTag: "DesktopThemeSyncError", }), ); for (const [, attributes] of errorLog.mock.calls) { expect(attributes).not.toHaveProperty("cause"); expect(JSON.stringify(attributes)).not.toContain(cause.message); } });}); describe("onboarding theme", () => { it("clears custom palettes and restores the latest selected theme", async () => { const storage = createStorage(); const classes = new Set<string>(); const styleValues = new Map<string, string>(); const root = { classList: { add: (name: string) => classes.add(name), remove: (name: string) => classes.delete(name), toggle: (name: string, force?: boolean) => { const next = force ?? !classes.has(name); if (next) classes.add(name); else classes.delete(name); return next; }, }, dataset: {} as Record<string, string>, offsetHeight: 0, style: { backgroundColor: "", removeProperty: (name: string) => styleValues.delete(name), setProperty: (name: string, value: string) => styleValues.set(name, value), }, }; vi.doMock("react", () => ({ useCallback: <A>(callback: A) => callback, useEffect: () => undefined, useSyncExternalStore: ( subscribe: (listener: () => void) => () => void, getSnapshot: () => unknown, ) => { subscribe(() => undefined); return getSnapshot(); }, })); vi.stubGlobal("window", { addEventListener: () => undefined, localStorage: storage, matchMedia: () => ({ matches: false, addEventListener: () => undefined, removeEventListener: () => undefined, }), removeEventListener: () => undefined, }); vi.stubGlobal("document", { body: { style: { backgroundColor: "" } }, createElement: () => ({ name: "", setAttribute: () => undefined }), documentElement: root, head: { append: () => undefined }, querySelector: () => null, querySelectorAll: () => [], }); vi.stubGlobal("getComputedStyle", () => ({ backgroundColor: "rgb(0, 0, 0)", getPropertyValue: () => "", })); vi.stubGlobal("requestAnimationFrame", (callback: FrameRequestCallback) => { callback(0); return 0; }); const { EMBER_THEME, installCustomTheme } = await import("../themePalette"); const firstTheme = installCustomTheme({ ...EMBER_THEME, id: "first-custom", label: "First Custom", }); const secondTheme = installCustomTheme({ ...EMBER_THEME, id: "second-custom", label: "Second Custom", colors: { ...EMBER_THEME.colors, error: "#123456" }, }); storage.setItem("t3code:theme", firstTheme.id); const { mountOnboardingTheme, useTheme } = await import("./useTheme"); expect(root.dataset.themeId).toBe(firstTheme.id); expect(styleValues.get("--app-theme-error")).toBe(firstTheme.colors.error); const cleanup = mountOnboardingTheme(); expect(root.dataset.themeId).toBeUndefined(); expect(styleValues.size).toBe(0); expect(useTheme().setTheme(secondTheme.id)).toBe(true); expect(root.dataset.themeId).toBeUndefined(); expect(styleValues.size).toBe(0); cleanup(); expect(root.dataset.themeId).toBe(secondTheme.id); expect(styleValues.get("--app-theme-error")).toBe(secondTheme.colors.error); }); it("stays dark during storage changes and restores the latest saved theme", async () => { const storage = createStorage(); storage.setItem("t3code:theme", "light"); const classes = new Set<string>(); const styleValues = new Map<string, string>(); const style = { backgroundColor: "", removeProperty: (name: string) => styleValues.delete(name), setProperty: (name: string, value: string) => styleValues.set(name, value), }; const root = { classList: { add: (name: string) => classes.add(name), contains: (name: string) => classes.has(name), remove: (name: string) => classes.delete(name), toggle: (name: string, force?: boolean) => { const next = force ?? !classes.has(name); if (next) classes.add(name); else classes.delete(name); return next; }, }, dataset: {} as Record<string, string>, offsetHeight: 0, style, }; const body = { style: { backgroundColor: "" } }; let storageHandler: ((event: StorageEvent) => void) | undefined; const setDesktopTheme = vi.fn().mockResolvedValue(undefined); vi.doMock("react", () => ({ useCallback: <A>(callback: A) => callback, useEffect: () => undefined, useSyncExternalStore: ( subscribe: (listener: () => void) => () => void, getSnapshot: () => unknown, ) => { subscribe(() => undefined); return getSnapshot(); }, })); vi.stubGlobal("window", { addEventListener: (type: string, listener: (event: StorageEvent) => void) => { if (type === "storage") storageHandler = listener; }, localStorage: storage, matchMedia: () => ({ matches: false, addEventListener: () => undefined, removeEventListener: () => undefined, }), removeEventListener: () => undefined, desktopBridge: { setTheme: setDesktopTheme }, }); vi.stubGlobal("document", { body, createElement: () => ({ name: "", setAttribute: () => undefined }), documentElement: root, head: { append: () => undefined }, querySelector: () => null, querySelectorAll: () => [], }); vi.stubGlobal("getComputedStyle", () => ({ backgroundColor: root.dataset.onboardingSurface !== undefined ? "rgb(0, 0, 0)" : classes.has("dark") ? "rgb(10, 10, 10)" : "rgb(255, 255, 255)", getPropertyValue: () => "", })); vi.stubGlobal("requestAnimationFrame", (callback: FrameRequestCallback) => { callback(0); return 0; }); const { mountOnboardingTheme, useTheme } = await import("./useTheme"); expect(useTheme().resolvedTheme).toBe("light"); const cleanup = mountOnboardingTheme(); expect(root.dataset.onboardingSurface).toBe(""); expect(classes.has("dark")).toBe(true); expect(root.style.backgroundColor).toBe("#000"); expect(body.style.backgroundColor).toBe("#000"); expect(useTheme().resolvedTheme).toBe("dark"); expect(setDesktopTheme).toHaveBeenLastCalledWith("dark"); storage.setItem("t3code:theme", "dark"); storageHandler?.({ key: "t3code:theme" } as StorageEvent); storage.setItem("t3code:theme", "light"); storageHandler?.({ key: "t3code:theme" } as StorageEvent); expect(classes.has("dark")).toBe(true); expect(useTheme().resolvedTheme).toBe("dark"); cleanup(); expect(root.dataset.onboardingSurface).toBeUndefined(); expect(classes.has("dark")).toBe(false); expect(root.style.backgroundColor).toBe("rgb(255, 255, 255)"); expect(body.style.backgroundColor).toBe("rgb(255, 255, 255)"); expect(storage.getItem("t3code:theme")).toBe("light"); expect(useTheme().resolvedTheme).toBe("light"); expect(setDesktopTheme).toHaveBeenLastCalledWith("light"); });});
import { afterEach, describe, expect, it, vi } from "vite-plus/test";
function createStorage(overrides: Partial<Storage> = {}): Storage {
const store = new Map<string, string>();
return {
clear: () => store.clear(),
getItem: (key) => store.get(key) ?? null,
key: (index) => [...store.keys()][index] ?? null,
get length() {
return store.size;
},
removeItem: (key) => {
store.delete(key);
},
setItem: (key, value) => {
store.set(key, value);
},
...overrides,
};
}
afterEach(() => {
vi.doUnmock("react");
vi.resetModules();
vi.restoreAllMocks();
vi.unstubAllGlobals();
});
describe("theme failure handling", () => {
it("preserves exact storage causes and operation context", async () => {
const readCause = new Error("storage read blocked");
const writeCause = new Error("storage quota exceeded");
vi.stubGlobal("window", {
localStorage: createStorage({
getItem: () => {
throw readCause;
},
setItem: () => {
throw writeCause;
},
}),
});
const { readThemePreference, ThemeStorageError, writeThemePreference } =
await import("./useTheme");
try {
readThemePreference();
expect.unreachable("expected the theme read to fail");
} catch (error) {
expect(error).toBeInstanceOf(ThemeStorageError);
expect(error).toMatchObject({
operation: "read",
storageKey: "t3code:theme",
cause: readCause,
});
}
try {
writeThemePreference("dark");
expect.unreachable("expected the theme write to fail");
} catch (error) {
expect(error).toBeInstanceOf(ThemeStorageError);
expect(error).toMatchObject({
operation: "write",
storageKey: "t3code:theme",
theme: "dark",
cause: writeCause,
});
}
});
it("reads the persisted T3 Chat theme preference", async () => {
vi.stubGlobal("window", {
localStorage: createStorage({
getItem: () => "t3-chat",
}),
});
const { readThemePreference } = await import("./useTheme");
expect(readThemePreference()).toBe("t3-chat");
});
it("falls back during initial theme application and logs only safe attributes", async () => {
const cause = new Error("private browsing storage failure");
const errorLog = vi.spyOn(console, "error").mockImplementation(() => {});
vi.stubGlobal("window", {
localStorage: createStorage({
getItem: () => {
throw cause;
},
}),
matchMedia: () => ({ matches: false }),
});
vi.stubGlobal("document", {
documentElement: {
classList: { toggle: vi.fn() },
},
});
await expect(import("./useTheme")).resolves.toBeDefined();
expect(errorLog).toHaveBeenCalledWith(
"Failed to read theme preference for t3code:theme.",
expect.objectContaining({
operation: "read",
storageKey: "t3code:theme",
errorTag: "ThemeStorageError",
}),
);
const attributes = errorLog.mock.calls[0]?.[1];
expect(attributes).not.toHaveProperty("cause");
expect(JSON.stringify(attributes)).not.toContain(cause.message);
});
it("retries a failed storage read only after a relevant storage event", async () => {
const cause = new Error("persistent storage failure");
const themeGetItem = vi.fn((): string | null => {
throw cause;
});
const getItem = vi.fn((key: string) => (key === "t3code:theme" ? themeGetItem() : null));
const errorLog = vi.spyOn(console, "error").mockImplementation(() => {});
let readSnapshot: (() => unknown) | undefined;
let subscribeToTheme: ((listener: () => void) => () => void) | undefined;
let storageHandler: ((event: StorageEvent) => void) | undefined;
vi.doMock("react", () => ({
useCallback: <A>(callback: A) => callback,
useEffect: () => undefined,
useSyncExternalStore: (
subscribe: (listener: () => void) => () => void,
getSnapshot: () => unknown,
) => {
subscribeToTheme = subscribe;
readSnapshot = getSnapshot;
return getSnapshot();
},
}));
vi.stubGlobal("window", {
addEventListener: (type: string, listener: (event: StorageEvent) => void) => {
if (type === "storage") storageHandler = listener;
},
localStorage: createStorage({ getItem }),
matchMedia: () => ({
matches: false,
addEventListener: () => undefined,
removeEventListener: () => undefined,
}),
removeEventListener: () => undefined,
});
const { useTheme } = await import("./useTheme");
useTheme();
readSnapshot?.();
readSnapshot?.();
expect(themeGetItem).toHaveBeenCalledTimes(1);
expect(errorLog).toHaveBeenCalledTimes(1);
const unsubscribe = subscribeToTheme?.(() => undefined);
storageHandler?.({ key: "t3code:theme" } as StorageEvent);
readSnapshot?.();
expect(themeGetItem).toHaveBeenCalledTimes(2);
expect(errorLog).toHaveBeenCalledTimes(2);
unsubscribe?.();
});
it("preserves desktop sync causes and retries after a failed cosmetic sync", async () => {
const cause = new Error("desktop IPC unavailable");
const errorLog = vi.spyOn(console, "error").mockImplementation(() => {});
const setTheme = vi.fn().mockRejectedValue(cause);
vi.stubGlobal("window", { desktopBridge: { setTheme } });
const { DesktopThemeSyncError, syncDesktopTheme, syncDesktopThemePreference } =
await import("./useTheme");
const error = await syncDesktopThemePreference({ setTheme }, "dark").then(
() => undefined,
(failure: unknown) => failure,
);
expect(error).toBeInstanceOf(DesktopThemeSyncError);
expect(error).toMatchObject({ theme: "dark", cause });
setTheme.mockClear();
syncDesktopTheme("dark");
await Promise.resolve();
await Promise.resolve();
syncDesktopTheme("dark");
await Promise.resolve();
await Promise.resolve();
expect(setTheme).toHaveBeenCalledTimes(2);
expect(errorLog).toHaveBeenCalledWith(
"Failed to sync the dark theme to the desktop shell.",
expect.objectContaining({
theme: "dark",
errorTag: "DesktopThemeSyncError",
}),
);
for (const [, attributes] of errorLog.mock.calls) {
expect(attributes).not.toHaveProperty("cause");
expect(JSON.stringify(attributes)).not.toContain(cause.message);
}
});
});
describe("onboarding theme", () => {
it("clears custom palettes and restores the latest selected theme", async () => {
const storage = createStorage();
const classes = new Set<string>();
const styleValues = new Map<string, string>();
const root = {
classList: {
add: (name: string) => classes.add(name),
remove: (name: string) => classes.delete(name),
toggle: (name: string, force?: boolean) => {
const next = force ?? !classes.has(name);
if (next) classes.add(name);
else classes.delete(name);
return next;
},
},
dataset: {} as Record<string, string>,
offsetHeight: 0,
style: {
backgroundColor: "",
removeProperty: (name: string) => styleValues.delete(name),
setProperty: (name: string, value: string) => styleValues.set(name, value),
},
};
vi.doMock("react", () => ({
useCallback: <A>(callback: A) => callback,
useEffect: () => undefined,
useSyncExternalStore: (
subscribe: (listener: () => void) => () => void,
getSnapshot: () => unknown,
) => {
subscribe(() => undefined);
return getSnapshot();
},
}));
vi.stubGlobal("window", {
addEventListener: () => undefined,
localStorage: storage,
matchMedia: () => ({
matches: false,
addEventListener: () => undefined,
removeEventListener: () => undefined,
}),
removeEventListener: () => undefined,
});
vi.stubGlobal("document", {
body: { style: { backgroundColor: "" } },
createElement: () => ({ name: "", setAttribute: () => undefined }),
documentElement: root,
head: { append: () => undefined },
querySelector: () => null,
querySelectorAll: () => [],
});
vi.stubGlobal("getComputedStyle", () => ({
backgroundColor: "rgb(0, 0, 0)",
getPropertyValue: () => "",
}));
vi.stubGlobal("requestAnimationFrame", (callback: FrameRequestCallback) => {
callback(0);
return 0;
});
const { EMBER_THEME, installCustomTheme } = await import("../themePalette");
const firstTheme = installCustomTheme({
...EMBER_THEME,
id: "first-custom",
label: "First Custom",
});
const secondTheme = installCustomTheme({
...EMBER_THEME,
id: "second-custom",
label: "Second Custom",
colors: { ...EMBER_THEME.colors, error: "#123456" },
});
storage.setItem("t3code:theme", firstTheme.id);
const { mountOnboardingTheme, useTheme } = await import("./useTheme");
expect(root.dataset.themeId).toBe(firstTheme.id);
expect(styleValues.get("--app-theme-error")).toBe(firstTheme.colors.error);
const cleanup = mountOnboardingTheme();
expect(root.dataset.themeId).toBeUndefined();
expect(styleValues.size).toBe(0);
expect(useTheme().setTheme(secondTheme.id)).toBe(true);
expect(root.dataset.themeId).toBeUndefined();
expect(styleValues.size).toBe(0);
cleanup();
expect(root.dataset.themeId).toBe(secondTheme.id);
expect(styleValues.get("--app-theme-error")).toBe(secondTheme.colors.error);
});
it("stays dark during storage changes and restores the latest saved theme", async () => {
const storage = createStorage();
storage.setItem("t3code:theme", "light");
const classes = new Set<string>();
const styleValues = new Map<string, string>();
const style = {
backgroundColor: "",
removeProperty: (name: string) => styleValues.delete(name),
setProperty: (name: string, value: string) => styleValues.set(name, value),
};
const root = {
classList: {
add: (name: string) => classes.add(name),
contains: (name: string) => classes.has(name),
remove: (name: string) => classes.delete(name),
toggle: (name: string, force?: boolean) => {
const next = force ?? !classes.has(name);
if (next) classes.add(name);
else classes.delete(name);
return next;
},
},
dataset: {} as Record<string, string>,
offsetHeight: 0,
style,
};
const body = { style: { backgroundColor: "" } };
let storageHandler: ((event: StorageEvent) => void) | undefined;
const setDesktopTheme = vi.fn().mockResolvedValue(undefined);
vi.doMock("react", () => ({
useCallback: <A>(callback: A) => callback,
useEffect: () => undefined,
useSyncExternalStore: (
subscribe: (listener: () => void) => () => void,
getSnapshot: () => unknown,
) => {
subscribe(() => undefined);
return getSnapshot();
},
}));
vi.stubGlobal("window", {
addEventListener: (type: string, listener: (event: StorageEvent) => void) => {
if (type === "storage") storageHandler = listener;
},
localStorage: storage,
matchMedia: () => ({
matches: false,
addEventListener: () => undefined,
removeEventListener: () => undefined,
}),
removeEventListener: () => undefined,
desktopBridge: { setTheme: setDesktopTheme },
});
vi.stubGlobal("document", {
body,
createElement: () => ({ name: "", setAttribute: () => undefined }),
documentElement: root,
head: { append: () => undefined },
querySelector: () => null,
querySelectorAll: () => [],
});
vi.stubGlobal("getComputedStyle", () => ({
backgroundColor:
root.dataset.onboardingSurface !== undefined
? "rgb(0, 0, 0)"
: classes.has("dark")
? "rgb(10, 10, 10)"
: "rgb(255, 255, 255)",
getPropertyValue: () => "",
}));
vi.stubGlobal("requestAnimationFrame", (callback: FrameRequestCallback) => {
callback(0);
return 0;
});
const { mountOnboardingTheme, useTheme } = await import("./useTheme");
expect(useTheme().resolvedTheme).toBe("light");
const cleanup = mountOnboardingTheme();
expect(root.dataset.onboardingSurface).toBe("");
expect(classes.has("dark")).toBe(true);
expect(root.style.backgroundColor).toBe("#000");
expect(body.style.backgroundColor).toBe("#000");
expect(useTheme().resolvedTheme).toBe("dark");
expect(setDesktopTheme).toHaveBeenLastCalledWith("dark");
storage.setItem("t3code:theme", "dark");
storageHandler?.({ key: "t3code:theme" } as StorageEvent);
storage.setItem("t3code:theme", "light");
storageHandler?.({ key: "t3code:theme" } as StorageEvent);
expect(classes.has("dark")).toBe(true);
expect(useTheme().resolvedTheme).toBe("dark");
cleanup();
expect(root.dataset.onboardingSurface).toBeUndefined();
expect(classes.has("dark")).toBe(false);
expect(root.style.backgroundColor).toBe("rgb(255, 255, 255)");
expect(body.style.backgroundColor).toBe("rgb(255, 255, 255)");
expect(storage.getItem("t3code:theme")).toBe("light");
expect(useTheme().resolvedTheme).toBe("light");
expect(setDesktopTheme).toHaveBeenLastCalledWith("light");
});
});