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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useLoadingIndicator } from './useLoadingIndicator.js';
import { StreamingState } from '../types.js';
import {
WITTY_LOADING_PHRASES,
PHRASE_CHANGE_INTERVAL_MS,
} from '../constants.js';
describe('useLoadingIndicator', () => {
beforeEach(() => {
vi.useFakeTimers();
});
afterEach(() => {
vi.restoreAllMocks();
});
it('should initialize with default values when not responding', () => {
const { result } = renderHook(() =>
useLoadingIndicator(StreamingState.Idle, false),
);
expect(result.current.elapsedTime).toBe(0);
expect(result.current.currentLoadingPhrase).toBe(WITTY_LOADING_PHRASES[0]);
expect(result.current.shouldShowSpinner).toBe(true);
});
describe('when streamingState is Responding', () => {
it('should increment elapsedTime and cycle phrases when not paused', () => {
const { result } = renderHook(() =>
useLoadingIndicator(StreamingState.Responding, false),
);
expect(result.current.shouldShowSpinner).toBe(true);
expect(result.current.currentLoadingPhrase).toBe(
WITTY_LOADING_PHRASES[0],
);
act(() => {
vi.advanceTimersByTime(1000);
});
expect(result.current.elapsedTime).toBe(1);
act(() => {
vi.advanceTimersByTime(PHRASE_CHANGE_INTERVAL_MS);
});
expect(result.current.currentLoadingPhrase).toBe(
WITTY_LOADING_PHRASES[1],
);
expect(result.current.elapsedTime).toBe(
1 + PHRASE_CHANGE_INTERVAL_MS / 1000,
);
});
it('should pause elapsedTime, show specific phrase, and hide spinner when paused', () => {
const { result, rerender } = renderHook(
({ isPaused }) =>
useLoadingIndicator(StreamingState.Responding, isPaused),
{ initialProps: { isPaused: false } },
);
act(() => {
vi.advanceTimersByTime(2000);
});
expect(result.current.elapsedTime).toBe(2);
expect(result.current.shouldShowSpinner).toBe(true);
rerender({ isPaused: true });
expect(result.current.currentLoadingPhrase).toBe(
'Waiting for user confirmation...',
);
expect(result.current.shouldShowSpinner).toBe(false);
// Time should not advance while paused
const timeBeforePauseAdv = result.current.elapsedTime;
act(() => {
vi.advanceTimersByTime(3000);
});
expect(result.current.elapsedTime).toBe(timeBeforePauseAdv);
// Unpause
rerender({ isPaused: false });
expect(result.current.shouldShowSpinner).toBe(true);
// Phrase should reset to the beginning of witty phrases
expect(result.current.currentLoadingPhrase).toBe(
WITTY_LOADING_PHRASES[0],
);
act(() => {
vi.advanceTimersByTime(1000);
});
// Elapsed time should resume from where it left off
expect(result.current.elapsedTime).toBe(timeBeforePauseAdv + 1);
});
it('should reset timer and phrase when streamingState changes from Responding to Idle', () => {
const { result, rerender } = renderHook(
({ streamingState }) => useLoadingIndicator(streamingState, false),
{ initialProps: { streamingState: StreamingState.Responding } },
);
act(() => {
vi.advanceTimersByTime(PHRASE_CHANGE_INTERVAL_MS + 1000);
});
expect(result.current.elapsedTime).toBe(
PHRASE_CHANGE_INTERVAL_MS / 1000 + 1,
);
expect(result.current.currentLoadingPhrase).toBe(
WITTY_LOADING_PHRASES[1],
);
rerender({ streamingState: StreamingState.Idle });
expect(result.current.elapsedTime).toBe(0);
// When idle, the phrase interval should be cleared, but the last phrase might persist
// until the next "Responding" state. The important part is that the timer is reset.
// Depending on exact timing, it might be the last witty phrase or the first.
// For this test, we'll ensure it's one of them.
expect(WITTY_LOADING_PHRASES).toContain(
result.current.currentLoadingPhrase,
);
});
});
it('should clear intervals on unmount', () => {
const { unmount } = renderHook(() =>
useLoadingIndicator(StreamingState.Responding, false),
);
const clearIntervalSpy = vi.spyOn(global, 'clearInterval');
unmount();
// Expecting two intervals (elapsedTime and phraseInterval) to be cleared.
expect(clearIntervalSpy).toHaveBeenCalledTimes(2);
});
it('should reset to initial witty phrase when unpaused', () => {
const { result, rerender } = renderHook(
({ isPaused }) =>
useLoadingIndicator(StreamingState.Responding, isPaused),
{ initialProps: { isPaused: false } },
);
// Advance to the second witty phrase
act(() => {
vi.advanceTimersByTime(PHRASE_CHANGE_INTERVAL_MS);
});
expect(result.current.currentLoadingPhrase).toBe(WITTY_LOADING_PHRASES[1]);
// Pause
rerender({ isPaused: true });
expect(result.current.currentLoadingPhrase).toBe(
'Waiting for user confirmation...',
);
// Unpause
rerender({ isPaused: false });
expect(result.current.currentLoadingPhrase).toBe(WITTY_LOADING_PHRASES[0]);
});
});
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