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packages/hive-mind-core/tests/mind/temporal-knowledge.test.ts

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+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { MindDB } from '../../src/mind/db.js';
+import { KnowledgeGraph } from '../../src/mind/knowledge.js';
+
+describe('Temporal Knowledge Queries', () => {
+  let db: MindDB;
+  let kg: KnowledgeGraph;
+
+  beforeEach(() => {
+    db = new MindDB(':memory:');
+    kg = new KnowledgeGraph(db);
+  });
+
+  afterEach(() => {
+    db.close();
+  });
+
+  it('queries entities valid at a specific time', () => {
+    kg.createEntity('fact', 'Alice is on Team Alpha', {}, {
+      valid_from: '2026-01-01T00:00:00Z',
+      valid_to: '2026-02-01T00:00:00Z',
+    });
+    kg.createEntity('fact', 'Alice is on Team Beta', {}, {
+      valid_from: '2026-02-01T00:00:00Z',
+    });
+
+    const jan = kg.getEntitiesValidAt('2026-01-15T00:00:00Z');
+    expect(jan.some(e => e.name.includes('Alpha'))).toBe(true);
+    expect(jan.some(e => e.name.includes('Beta'))).toBe(false);
+
+    const feb = kg.getEntitiesValidAt('2026-02-15T00:00:00Z');
+    expect(feb.some(e => e.name.includes('Beta'))).toBe(true);
+    expect(feb.some(e => e.name.includes('Alpha'))).toBe(false);
+  });
+
+  it('entities with no valid_from default to creation time', () => {
+    const entity = kg.createEntity('person', 'Charlie', {});
+    const now = new Date().toISOString();
+    const results = kg.getEntitiesValidAt(now);
+    expect(results.some(e => e.name === 'Charlie')).toBe(true);
+  });
+
+  it('entities with valid_to in the past are excluded', () => {
+    kg.createEntity('fact', 'Expired fact', {}, {
+      valid_from: '2020-01-01T00:00:00Z',
+      valid_to: '2020-06-01T00:00:00Z',
+    });
+
+    const results = kg.getEntitiesValidAt('2026-01-01T00:00:00Z');
+    expect(results.some(e => e.name === 'Expired fact')).toBe(false);
+  });
+
+  it('entities with future valid_from are excluded', () => {
+    kg.createEntity('fact', 'Future fact', {}, {
+      valid_from: '2030-01-01T00:00:00Z',
+    });
+
+    const results = kg.getEntitiesValidAt('2026-01-01T00:00:00Z');
+    expect(results.some(e => e.name === 'Future fact')).toBe(false);
+  });
+});