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/** * SnapshotDiffer Test Suite * Tests snapshot comparison and diff algorithms */ import { SnapshotDiffer } from '../testing/SnapshotDiffer.js'; import { SessionSnapshot } from '../types/test-framework.js'; describe('SnapshotDiffer', () => { let differ: SnapshotDiffer; beforeEach(() => { differ = new SnapshotDiffer(); }); const createSnapshot = ( id: string, output: string, state: any = {} ): SessionSnapshot => ({ sessionId: id, timestamp: Date.now(), output, state, metadata: {}, }); describe('compare', () => { it('should detect identical snapshots', () => { const snap1 = createSnapshot('test', 'output', { a: 1 }); const snap2 = createSnapshot('test', 'output', { a: 1 }); const diff = differ.compare(snap1, snap2); expect(diff.identical).toBe(true); expect(diff.added).toEqual([]); expect(diff.removed).toEqual([]); expect(diff.changed).toEqual([]); expect(diff.similarity).toBe(1); }); it('should detect added lines', () => { const snap1 = createSnapshot('test', 'line1\nline2', {}); const snap2 = createSnapshot('test', 'line1\nline2\nline3', {}); const diff = differ.compare(snap1, snap2); expect(diff.identical).toBe(false); expect(diff.added).toContain('line3'); }); it('should detect removed lines', () => { const snap1 = createSnapshot('test', 'line1\nline2\nline3', {}); const snap2 = createSnapshot('test', 'line1\nline2', {}); const diff = differ.compare(snap1, snap2); expect(diff.identical).toBe(false); expect(diff.removed).toContain('line3'); }); it('should detect state changes', () => { const snap1 = createSnapshot('test', 'output', { a: 1, b: 2 }); const snap2 = createSnapshot('test', 'output', { a: 1, b: 3 }); const diff = differ.compare(snap1, snap2); expect(diff.identical).toBe(false); expect(diff.changed.length).toBeGreaterThan(0); }); }); describe('compareDetailed', () => { it('should provide line-by-line diff', () => { const snap1 = createSnapshot('test', 'line1\nline2\nline3', {}); const snap2 = createSnapshot('test', 'line1\nline2\nline4', {}); const detailed = differ.compareDetailed(snap1, snap2); expect(detailed.outputDiff.length).toBeGreaterThan(0); expect(detailed.outputDiff.some((d) => d.type === 'unchanged')).toBe( true ); expect(detailed.outputDiff.some((d) => d.type === 'removed')).toBe(true); expect(detailed.outputDiff.some((d) => d.type === 'added')).toBe(true); }); it('should detect object state diff', () => { const snap1 = createSnapshot('test', 'output', { a: 1, b: 2 }); const snap2 = createSnapshot('test', 'output', { a: 1, b: 3, c: 4 }); const detailed = differ.compareDetailed(snap1, snap2); expect(detailed.stateDiff.added).toContain('c'); expect(detailed.stateDiff.modified.some((m) => m.key === 'b')).toBe(true); }); it('should handle nested state', () => { const snap1 = createSnapshot('test', 'output', { a: { b: { c: 1 } } }); const snap2 = createSnapshot('test', 'output', { a: { b: { c: 2 } } }); const detailed = differ.compareDetailed(snap1, snap2); expect(detailed.stateDiff.modified.length).toBeGreaterThan(0); }); }); describe('calculateSimilarity', () => { it('should return 1 for identical snapshots', () => { const snap1 = createSnapshot('test', 'output', { a: 1 }); const snap2 = createSnapshot('test', 'output', { a: 1 }); const similarity = differ.calculateSimilarity(snap1, snap2); expect(similarity).toBe(1); }); it('should return 0 for completely different snapshots', () => { const snap1 = createSnapshot('test', 'line1\nline2\nline3', { a: 1, b: 2, }); const snap2 = createSnapshot('test', 'lineA\nlineB\nlineC', { x: 9, y: 10, }); const similarity = differ.calculateSimilarity(snap1, snap2); expect(similarity).toBeGreaterThanOrEqual(0); expect(similarity).toBeLessThan(0.5); }); it('should return value between 0 and 1 for partial matches', () => { const snap1 = createSnapshot('test', 'line1\nline2\nline3', { a: 1 }); const snap2 = createSnapshot('test', 'line1\nline2', { a: 1 }); const similarity = differ.calculateSimilarity(snap1, snap2); expect(similarity).toBeGreaterThan(0); expect(similarity).toBeLessThan(1); }); }); describe('formatDiff', () => { it('should format diff as text', () => { const snap1 = createSnapshot('test', 'line1\nline2', { a: 1 }); const snap2 = createSnapshot('test', 'line1\nline3', { a: 2 }); const detailed = differ.compareDetailed(snap1, snap2); const formatted = differ.formatDiff(detailed); expect(formatted).toContain('=== Snapshot Diff ==='); expect(formatted).toContain('Similarity:'); expect(formatted).toContain('Output Diff'); }); it('should indicate identical snapshots', () => { const snap1 = createSnapshot('test', 'output', { a: 1 }); const snap2 = createSnapshot('test', 'output', { a: 1 }); const detailed = differ.compareDetailed(snap1, snap2); const formatted = differ.formatDiff(detailed); expect(formatted).toContain('identical'); }); it('should show added and removed lines', () => { const snap1 = createSnapshot('test', 'line1\nline2', {}); const snap2 = createSnapshot('test', 'line1\nline3', {}); const detailed = differ.compareDetailed(snap1, snap2); const formatted = differ.formatDiff(detailed); expect(formatted).toMatch(/[-+]/); }); it('should show state changes', () => { const snap1 = createSnapshot('test', 'output', { a: 1, b: 2 }); const snap2 = createSnapshot('test', 'output', { a: 1, c: 3 }); const detailed = differ.compareDetailed(snap1, snap2); const formatted = differ.formatDiff(detailed); expect(formatted).toContain('State Diff'); }); }); describe('getSummary', () => { it('should provide summary statistics', () => { const snap1 = createSnapshot('test', 'line1\nline2\nline3', { a: 1, b: 2, }); const snap2 = createSnapshot('test', 'line1\nline4', { a: 1, c: 3 }); const detailed = differ.compareDetailed(snap1, snap2); const summary = differ.getSummary(detailed); expect(summary.linesAdded).toBeGreaterThanOrEqual(0); expect(summary.linesRemoved).toBeGreaterThanOrEqual(0); expect(summary.stateKeysAdded).toBeGreaterThanOrEqual(0); expect(summary.stateKeysRemoved).toBeGreaterThanOrEqual(0); expect(summary.stateKeysModified).toBeGreaterThanOrEqual(0); }); it('should return zero for identical snapshots', () => { const snap1 = createSnapshot('test', 'output', { a: 1 }); const snap2 = createSnapshot('test', 'output', { a: 1 }); const detailed = differ.compareDetailed(snap1, snap2); const summary = differ.getSummary(detailed); expect(summary.linesAdded).toBe(0); expect(summary.linesRemoved).toBe(0); expect(summary.stateKeysAdded).toBe(0); expect(summary.stateKeysRemoved).toBe(0); expect(summary.stateKeysModified).toBe(0); }); }); describe('edge cases', () => { it('should handle empty output', () => { const snap1 = createSnapshot('test', '', {}); const snap2 = createSnapshot('test', '', {}); const diff = differ.compare(snap1, snap2); expect(diff.identical).toBe(true); }); it('should handle empty state', () => { const snap1 = createSnapshot('test', 'output', {}); const snap2 = createSnapshot('test', 'output', {}); const diff = differ.compare(snap1, snap2); expect(diff.identical).toBe(true); }); it('should handle large output differences', () => { const snap1 = createSnapshot('test', 'a'.repeat(10000), {}); const snap2 = createSnapshot('test', 'b'.repeat(10000), {}); const detailed = differ.compareDetailed(snap1, snap2); expect(detailed.similarity).toBeLessThan(0.5); }); it('should handle complex nested state', () => { const snap1 = createSnapshot('test', 'output', { level1: { level2: { level3: { value: 1, }, }, }, }); const snap2 = createSnapshot('test', 'output', { level1: { level2: { level3: { value: 2, }, }, }, }); const detailed = differ.compareDetailed(snap1, snap2); expect(detailed.stateDiff.modified.length).toBeGreaterThan(0); }); }); });