a50ee01626
Creates diff-cache.ts module with generic DiffCache<T> class (TTL, prefix invalidation, env-var configuration) and exports phaseMetaCache / fileDiffCache singletons. Wires cache into getPhaseReviewDiff via getHeadCommitHash on BranchManager. Adds 6 unit tests for DiffCache and 5 integration tests verifying cache hit/miss behaviour, prefix invalidation, and NOT_FOUND guard. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
77 lines
2.8 KiB
TypeScript
77 lines
2.8 KiB
TypeScript
/**
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* Unit tests for DiffCache class.
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*
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* Tests TTL expiry, prefix invalidation, and env-var TTL configuration.
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*/
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import { describe, it, expect, vi, afterEach } from 'vitest';
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import { DiffCache } from './diff-cache.js';
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afterEach(() => {
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vi.restoreAllMocks();
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});
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describe('DiffCache', () => {
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it('returns undefined for a key that was never set', () => {
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const cache = new DiffCache<string>(5000);
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expect(cache.get('nonexistent')).toBeUndefined();
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});
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it('returns value when entry has not expired', () => {
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vi.spyOn(Date, 'now').mockReturnValue(1000);
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const cache = new DiffCache<string>(5000);
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cache.set('key', 'value');
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vi.spyOn(Date, 'now').mockReturnValue(5999); // 4999ms elapsed, TTL=5000
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expect(cache.get('key')).toBe('value');
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});
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it('returns undefined and deletes the entry when TTL has elapsed', () => {
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vi.spyOn(Date, 'now').mockReturnValue(1000);
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const cache = new DiffCache<string>(5000);
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cache.set('key', 'value');
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vi.spyOn(Date, 'now').mockReturnValue(6001); // 5001ms elapsed, TTL=5000
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expect(cache.get('key')).toBeUndefined();
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// Verify the key is no longer stored (second get also returns undefined)
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vi.spyOn(Date, 'now').mockReturnValue(6001);
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expect(cache.get('key')).toBeUndefined();
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});
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it('overwrites an existing entry and resets its TTL', () => {
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vi.spyOn(Date, 'now').mockReturnValue(1000);
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const cache = new DiffCache<string>(5000);
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cache.set('key', 'first');
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vi.spyOn(Date, 'now').mockReturnValue(4000); // overwrite before expiry
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cache.set('key', 'second');
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vi.spyOn(Date, 'now').mockReturnValue(8999); // 4999ms after overwrite, TTL=5000
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expect(cache.get('key')).toBe('second');
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vi.spyOn(Date, 'now').mockReturnValue(9001); // 5001ms after overwrite
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expect(cache.get('key')).toBeUndefined();
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});
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it('invalidateByPrefix removes all matching keys and preserves others', () => {
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const cache = new DiffCache<string>(60_000);
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cache.set('phase-1:abc', 'a');
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cache.set('phase-1:abc:file.ts', 'b');
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cache.set('phase-2:xyz', 'c');
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cache.invalidateByPrefix('phase-1:');
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expect(cache.get('phase-1:abc')).toBeUndefined();
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expect(cache.get('phase-1:abc:file.ts')).toBeUndefined();
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expect(cache.get('phase-2:xyz')).toBe('c');
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});
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it('singleton instances use REVIEW_DIFF_CACHE_TTL_MS env var for TTL', async () => {
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vi.resetModules();
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vi.stubEnv('REVIEW_DIFF_CACHE_TTL_MS', '1000');
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const { phaseMetaCache } = await import('./diff-cache.js');
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vi.spyOn(Date, 'now').mockReturnValue(0);
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phaseMetaCache.set('key', {} as any);
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vi.spyOn(Date, 'now').mockReturnValue(999);
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expect(phaseMetaCache.get('key')).toBeDefined();
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vi.spyOn(Date, 'now').mockReturnValue(1001);
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expect(phaseMetaCache.get('key')).toBeUndefined();
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vi.unstubAllEnvs();
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});
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});
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