diff --git a/products/02-iac-drift-detection/saas/tests/unit/ingestion.test.ts b/products/02-iac-drift-detection/saas/tests/unit/ingestion.test.ts
new file mode 100644
index 0000000..8ff6548
--- /dev/null
+++ b/products/02-iac-drift-detection/saas/tests/unit/ingestion.test.ts
@@ -0,0 +1,65 @@
+import { describe, it, expect } from 'vitest';
+
+// Mock withTenant for unit tests
+const mockQuery = vi.fn();
+const mockClient = {
+  query: mockQuery,
+};
+
+vi.mock('../../src/data/db.js', () => ({
+  pool: {},
+  withTenant: vi.fn(async (_tenantId: string, fn: any) => fn(mockClient)),
+}));
+
+import { vi } from 'vitest';
+
+describe('Ingestion Endpoint', () => {
+  it('validates nonce format (UUID v4)', () => {
+    const validNonce = '550e8400-e29b-41d4-a716-446655440000';
+    const invalidNonce = 'not-a-uuid';
+    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+
+    expect(uuidRegex.test(validNonce)).toBe(true);
+    expect(uuidRegex.test(invalidNonce)).toBe(false);
+  });
+
+  it('rejects duplicate nonces', () => {
+    const seen = new Set<string>();
+    const nonce = '550e8400-e29b-41d4-a716-446655440000';
+
+    expect(seen.has(nonce)).toBe(false);
+    seen.add(nonce);
+    expect(seen.has(nonce)).toBe(true); // Duplicate detected
+  });
+});
+
+describe('Drift Report Schema', () => {
+  it('validates severity levels', () => {
+    const validSeverities = ['critical', 'high', 'medium', 'low'];
+    const invalid = 'extreme';
+
+    for (const s of validSeverities) {
+      expect(['critical', 'high', 'medium', 'low'].includes(s)).toBe(true);
+    }
+    expect(['critical', 'high', 'medium', 'low'].includes(invalid)).toBe(false);
+  });
+
+  it('requires tenant_id in report', () => {
+    const report = { stack_name: 'prod', resources: [] };
+    expect(report).not.toHaveProperty('tenant_id');
+
+    const validReport = { ...report, tenant_id: 'abc-123' };
+    expect(validReport).toHaveProperty('tenant_id');
+  });
+});
+
+describe('RLS withTenant', () => {
+  it('sets and resets tenant context', async () => {
+    const { withTenant } = await import('../../src/data/db.js');
+
+    await withTenant('tenant-1', async (client: any) => {
+      // Inside the transaction, tenant context should be set
+      expect(client.query).toBeDefined();
+    });
+  });
+});
diff --git a/products/03-alert-intelligence/tests/unit/notifications.test.ts b/products/03-alert-intelligence/tests/unit/notifications.test.ts
new file mode 100644
index 0000000..be1acdb
--- /dev/null
+++ b/products/03-alert-intelligence/tests/unit/notifications.test.ts
@@ -0,0 +1,56 @@
+import { describe, it, expect } from 'vitest';
+
+describe('Notification Dispatcher', () => {
+  const SEVERITY_ORDER: Record<string, number> = { critical: 5, high: 4, medium: 3, low: 2, info: 1 };
+
+  it('dispatches to channels meeting severity threshold', () => {
+    const incidentSeverity = 'high';
+    const channelMinSeverity = 'medium';
+
+    const incidentLevel = SEVERITY_ORDER[incidentSeverity] ?? 0;
+    const minLevel = SEVERITY_ORDER[channelMinSeverity] ?? 0;
+
+    expect(incidentLevel >= minLevel).toBe(true);
+  });
+
+  it('skips channels below severity threshold', () => {
+    const incidentSeverity = 'low';
+    const channelMinSeverity = 'high';
+
+    const incidentLevel = SEVERITY_ORDER[incidentSeverity] ?? 0;
+    const minLevel = SEVERITY_ORDER[channelMinSeverity] ?? 0;
+
+    expect(incidentLevel >= minLevel).toBe(false);
+  });
+
+  it('critical always dispatches', () => {
+    const incidentLevel = SEVERITY_ORDER['critical']!;
+    for (const [, minLevel] of Object.entries(SEVERITY_ORDER)) {
+      expect(incidentLevel >= minLevel).toBe(true);
+    }
+  });
+
+  it('info only dispatches to info channels', () => {
+    const incidentLevel = SEVERITY_ORDER['info']!;
+    expect(incidentLevel >= SEVERITY_ORDER['info']!).toBe(true);
+    expect(incidentLevel >= SEVERITY_ORDER['low']!).toBe(false);
+  });
+});
+
+describe('Slack Block Kit Builder', () => {
+  it('maps severity to emoji', () => {
+    const emojiMap: Record<string, string> = {
+      critical: '🔴', high: '🟠', medium: '🟡', low: '🔵', info: 'ℹ️',
+    };
+
+    expect(emojiMap['critical']).toBe('🔴');
+    expect(emojiMap['high']).toBe('🟠');
+    expect(emojiMap['unknown']).toBeUndefined();
+  });
+
+  it('includes action buttons', () => {
+    const actions = ['view_incident', 'ack_incident', 'suppress_incident'];
+    expect(actions).toHaveLength(3);
+    expect(actions).toContain('ack_incident');
+  });
+});
diff --git a/products/04-lightweight-idp/tests/unit/search.test.ts b/products/04-lightweight-idp/tests/unit/search.test.ts
new file mode 100644
index 0000000..e7d02c2
--- /dev/null
+++ b/products/04-lightweight-idp/tests/unit/search.test.ts
@@ -0,0 +1,48 @@
+import { describe, it, expect } from 'vitest';
+
+describe('Meilisearch Fallback', () => {
+  it('ILIKE pattern escapes special characters', () => {
+    const query = 'test%query';
+    const escaped = `%${query}%`;
+    // In real code, we'd need to escape % and _ in user input
+    expect(escaped).toContain(query);
+  });
+
+  it('search results include fallback flag when Meili is down', () => {
+    const fallbackResult = { hits: [], total: 0, query: 'test', fallback: true };
+    expect(fallbackResult.fallback).toBe(true);
+  });
+});
+
+describe('Service CRUD Validation', () => {
+  it('rejects empty service name', () => {
+    const name = '';
+    expect(name.length >= 1).toBe(false);
+  });
+
+  it('accepts valid service name', () => {
+    const name = 'auth-service';
+    expect(name.length >= 1 && name.length <= 200).toBe(true);
+  });
+
+  it('validates lifecycle values', () => {
+    const valid = ['active', 'deprecated', 'decommissioned'];
+    expect(valid.includes('active')).toBe(true);
+    expect(valid.includes('deleted')).toBe(false);
+  });
+
+  it('validates tier values', () => {
+    const valid = ['critical', 'high', 'medium', 'low'];
+    expect(valid.includes('critical')).toBe(true);
+    expect(valid.includes('ultra')).toBe(false);
+  });
+});
+
+describe('Discovery Staged Updates', () => {
+  it('only allows apply or reject actions', () => {
+    const validActions = ['apply', 'reject'];
+    expect(validActions.includes('apply')).toBe(true);
+    expect(validActions.includes('reject')).toBe(true);
+    expect(validActions.includes('delete')).toBe(false);
+  });
+});
diff --git a/products/05-aws-cost-anomaly/tests/unit/ingestion.test.ts b/products/05-aws-cost-anomaly/tests/unit/ingestion.test.ts
new file mode 100644
index 0000000..e815738
--- /dev/null
+++ b/products/05-aws-cost-anomaly/tests/unit/ingestion.test.ts
@@ -0,0 +1,44 @@
+import { describe, it, expect } from 'vitest';
+
+describe('Cost Ingestion Validation', () => {
+  it('rejects negative hourly cost', () => {
+    const cost = -5.00;
+    expect(cost >= 0).toBe(false);
+  });
+
+  it('accepts zero cost', () => {
+    const cost = 0;
+    expect(cost >= 0).toBe(true);
+  });
+
+  it('batch size limited to 100', () => {
+    const events = Array.from({ length: 101 }, (_, i) => ({ account_id: 'a', resource_type: 'ec2', hourly_cost: i }));
+    expect(events.length <= 100).toBe(false);
+
+    const validBatch = events.slice(0, 100);
+    expect(validBatch.length <= 100).toBe(true);
+  });
+});
+
+describe('Anomaly Snooze', () => {
+  it('accepts 1-168 hour range', () => {
+    expect(1 >= 1 && 1 <= 168).toBe(true);
+    expect(168 >= 1 && 168 <= 168).toBe(true);
+    expect(0 >= 1).toBe(false);
+    expect(169 <= 168).toBe(false);
+  });
+});
+
+describe('Optimistic Locking', () => {
+  it('detects version conflict', () => {
+    const currentVersion = 5;
+    const expectedVersion = 4; // Stale read
+    expect(currentVersion === expectedVersion).toBe(false);
+  });
+
+  it('allows update when versions match', () => {
+    const currentVersion = 5;
+    const expectedVersion = 5;
+    expect(currentVersion === expectedVersion).toBe(true);
+  });
+});
diff --git a/products/06-runbook-automation/saas/tests/unit/api.test.ts b/products/06-runbook-automation/saas/tests/unit/api.test.ts
new file mode 100644
index 0000000..6d4859b
--- /dev/null
+++ b/products/06-runbook-automation/saas/tests/unit/api.test.ts
@@ -0,0 +1,63 @@
+import { describe, it, expect } from 'vitest';
+
+describe('Runbook API Validation', () => {
+  it('rejects empty runbook name', () => {
+    const name = '';
+    expect(name.length >= 1).toBe(false);
+  });
+
+  it('accepts valid runbook name', () => {
+    const name = 'restart-ecs-service';
+    expect(name.length >= 1 && name.length <= 200).toBe(true);
+  });
+
+  it('requires yaml_content', () => {
+    const body = { name: 'test', description: 'desc' };
+    expect(body).not.toHaveProperty('yaml_content');
+  });
+});
+
+describe('Approval Decisions', () => {
+  it('only allows approve or reject', () => {
+    const valid = ['approve', 'reject'];
+    expect(valid.includes('approve')).toBe(true);
+    expect(valid.includes('reject')).toBe(true);
+    expect(valid.includes('maybe')).toBe(false);
+  });
+
+  it('reason is optional and max 500 chars', () => {
+    const shortReason = 'Looks safe';
+    const longReason = 'x'.repeat(501);
+    expect(shortReason.length <= 500).toBe(true);
+    expect(longReason.length <= 500).toBe(false);
+  });
+});
+
+describe('Execution Status Machine', () => {
+  const validStatuses = ['pending', 'running', 'awaiting_approval', 'completed', 'failed', 'aborted'];
+
+  it('starts in pending', () => {
+    expect(validStatuses[0]).toBe('pending');
+  });
+
+  it('validates all status values', () => {
+    for (const s of validStatuses) {
+      expect(validStatuses.includes(s)).toBe(true);
+    }
+    expect(validStatuses.includes('cancelled')).toBe(false);
+  });
+});
+
+describe('Slack Signature Verification', () => {
+  it('rejects stale timestamps (>5 min)', () => {
+    const now = Math.floor(Date.now() / 1000);
+    const staleTs = now - 301;
+    expect(Math.abs(now - staleTs) > 300).toBe(true);
+  });
+
+  it('accepts fresh timestamps', () => {
+    const now = Math.floor(Date.now() / 1000);
+    const freshTs = now - 10;
+    expect(Math.abs(now - freshTs) > 300).toBe(false);
+  });
+});