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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/** @vitest-environment jsdom */
import { describe, it, expect } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useReverseSearchCompletion } from './useReverseSearchCompletion.js';
import { useTextBuffer } from '../components/shared/text-buffer.js';
describe('useReverseSearchCompletion', () => {
function useTextBufferForTest(text: string) {
return useTextBuffer({
initialText: text,
initialCursorOffset: text.length,
viewport: { width: 80, height: 20 },
isValidPath: () => false,
onChange: () => {},
});
}
describe('Core Hook Behavior', () => {
describe('State Management', () => {
it('should initialize with default state', () => {
const mockShellHistory = ['echo hello'];
const { result } = renderHook(() =>
useReverseSearchCompletion(
useTextBufferForTest(''),
mockShellHistory,
false,
),
);
expect(result.current.suggestions).toEqual([]);
expect(result.current.activeSuggestionIndex).toBe(-1);
expect(result.current.visibleStartIndex).toBe(0);
expect(result.current.showSuggestions).toBe(false);
expect(result.current.isLoadingSuggestions).toBe(false);
});
it('should reset state when reverseSearchActive becomes false', () => {
const mockShellHistory = ['echo hello'];
const { result, rerender } = renderHook(
({ text, active }) => {
const textBuffer = useTextBufferForTest(text);
return useReverseSearchCompletion(
textBuffer,
mockShellHistory,
active,
);
},
{ initialProps: { text: 'echo', active: true } },
);
// Simulate reverseSearchActive becoming false
rerender({ text: 'echo', active: false });
expect(result.current.suggestions).toEqual([]);
expect(result.current.activeSuggestionIndex).toBe(-1);
expect(result.current.visibleStartIndex).toBe(0);
expect(result.current.showSuggestions).toBe(false);
});
describe('Navigation', () => {
it('should handle navigateUp with no suggestions', () => {
const mockShellHistory = ['echo hello'];
const { result } = renderHook(() =>
useReverseSearchCompletion(
useTextBufferForTest('grep'),
mockShellHistory,
true,
),
);
act(() => {
result.current.navigateUp();
});
expect(result.current.activeSuggestionIndex).toBe(-1);
});
it('should handle navigateDown with no suggestions', () => {
const mockShellHistory = ['echo hello'];
const { result } = renderHook(() =>
useReverseSearchCompletion(
useTextBufferForTest('grep'),
mockShellHistory,
true,
),
);
act(() => {
result.current.navigateDown();
});
expect(result.current.activeSuggestionIndex).toBe(-1);
});
it('should navigate up through suggestions with wrap-around', () => {
const mockShellHistory = [
'ls -l',
'ls -la',
'cd /some/path',
'git status',
'echo "Hello, World!"',
'echo Hi',
];
const { result } = renderHook(() =>
useReverseSearchCompletion(
useTextBufferForTest('echo'),
mockShellHistory,
true,
),
);
expect(result.current.suggestions.length).toBe(2);
expect(result.current.activeSuggestionIndex).toBe(0);
act(() => {
result.current.navigateUp();
});
expect(result.current.activeSuggestionIndex).toBe(1);
});
it('should navigate down through suggestions with wrap-around', () => {
const mockShellHistory = [
'ls -l',
'ls -la',
'cd /some/path',
'git status',
'echo "Hello, World!"',
'echo Hi',
];
const { result } = renderHook(() =>
useReverseSearchCompletion(
useTextBufferForTest('ls'),
mockShellHistory,
true,
),
);
expect(result.current.suggestions.length).toBe(2);
expect(result.current.activeSuggestionIndex).toBe(0);
act(() => {
result.current.navigateDown();
});
expect(result.current.activeSuggestionIndex).toBe(1);
});
it('should handle navigation with multiple suggestions', () => {
const mockShellHistory = [
'ls -l',
'ls -la',
'cd /some/path/l',
'git status',
'echo "Hello, World!"',
'echo "Hi all"',
];
const { result } = renderHook(() =>
useReverseSearchCompletion(
useTextBufferForTest('l'),
mockShellHistory,
true,
),
);
expect(result.current.suggestions.length).toBe(5);
expect(result.current.activeSuggestionIndex).toBe(0);
act(() => {
result.current.navigateDown();
});
expect(result.current.activeSuggestionIndex).toBe(1);
act(() => {
result.current.navigateDown();
});
expect(result.current.activeSuggestionIndex).toBe(2);
act(() => {
result.current.navigateUp();
});
expect(result.current.activeSuggestionIndex).toBe(1);
act(() => {
result.current.navigateUp();
});
expect(result.current.activeSuggestionIndex).toBe(0);
act(() => {
result.current.navigateUp();
});
expect(result.current.activeSuggestionIndex).toBe(4);
});
it('should handle navigation with large suggestion lists and scrolling', () => {
const largeMockCommands = Array.from(
{ length: 15 },
(_, i) => `echo ${i}`,
);
const { result } = renderHook(() =>
useReverseSearchCompletion(
useTextBufferForTest('echo'),
largeMockCommands,
true,
),
);
expect(result.current.suggestions.length).toBe(15);
expect(result.current.activeSuggestionIndex).toBe(0);
expect(result.current.visibleStartIndex).toBe(0);
act(() => {
result.current.navigateUp();
});
expect(result.current.activeSuggestionIndex).toBe(14);
expect(result.current.visibleStartIndex).toBe(Math.max(0, 15 - 8));
});
});
});
});
describe('Filtering', () => {
it('filters history by buffer.text and sets showSuggestions', () => {
const history = ['foo', 'barfoo', 'baz'];
const { result } = renderHook(() =>
useReverseSearchCompletion(useTextBufferForTest('foo'), history, true),
);
// should only return the two entries containing "foo"
expect(result.current.suggestions.map((s) => s.value)).toEqual([
'foo',
'barfoo',
]);
expect(result.current.showSuggestions).toBe(true);
});
it('hides suggestions when there are no matches', () => {
const history = ['alpha', 'beta'];
const { result } = renderHook(() =>
useReverseSearchCompletion(useTextBufferForTest('γ'), history, true),
);
expect(result.current.suggestions).toEqual([]);
expect(result.current.showSuggestions).toBe(false);
});
});
});
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