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packages/server/tests/local/cost.test.ts

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+/**
+ * Cost Dashboard API tests — GET /api/cost/summary and GET /api/cost/by-workspace.
+ *
+ * Tests cost calculation, empty state, daily breakdown, and budget alerts.
+ * Part of PM-4 — Agent Cost Dashboard.
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { MindDB, SessionStore, FrameStore } from '@waggle/core';
+import { buildLocalServer } from '../../src/local/index.js';
+import type { FastifyInstance } from 'fastify';
+import { injectWithAuth } from '../test-utils.js';
+
+describe('Cost Dashboard API', () => {
+  let server: FastifyInstance;
+  let tmpDir: string;
+
+  beforeAll(async () => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'waggle-cost-test-'));
+    // Set tier to TEAMS so cost routes pass tier enforcement
+    fs.writeFileSync(path.join(tmpDir, 'config.json'), JSON.stringify({ tier: 'TEAMS' }));
+    // Prevent auto-install of starter skills
+    fs.mkdirSync(path.join(tmpDir, 'skills'), { recursive: true });
+    fs.writeFileSync(path.join(tmpDir, 'skills', '.starter-installed'), 'test');
+
+    // Create personal.mind (required by buildLocalServer)
+    const personalPath = path.join(tmpDir, 'personal.mind');
+    const mind = new MindDB(personalPath);
+    const sessions = new SessionStore(mind);
+    const frames = new FrameStore(mind);
+    const s1 = sessions.create('cost-test');
+    frames.createIFrame(s1.gop_id, 'Cost test frame', 'normal');
+    mind.close();
+
+    server = await buildLocalServer({ dataDir: tmpDir });
+  });
+
+  afterAll(async () => {
+    await server.close();
+    fs.rmSync(tmpDir, { recursive: true, force: true });
+  });
+
+  it('GET /api/cost/summary returns expected shape with zero usage', async () => {
+    const res = await injectWithAuth(server, { method: 'GET', url: '/api/cost/summary' });
+    expect(res.statusCode).toBe(200);
+    const body = JSON.parse(res.body);
+
+    // Today
+    expect(body.today).toBeDefined();
+    expect(typeof body.today.inputTokens).toBe('number');
+    expect(typeof body.today.outputTokens).toBe('number');
+    expect(typeof body.today.estimatedCost).toBe('number');
+    expect(typeof body.today.turns).toBe('number');
+
+    // All-time — getStats() always works
+    expect(body.allTime).toBeDefined();
+    expect(body.allTime.inputTokens).toBe(0);
+    expect(body.allTime.outputTokens).toBe(0);
+    expect(body.allTime.estimatedCost).toBe(0);
+    expect(body.allTime.turns).toBe(0);
+
+    // Daily array (7 days default)
+    expect(body.daily).toBeDefined();
+    expect(Array.isArray(body.daily)).toBe(true);
+    expect(body.daily.length).toBe(7);
+
+    // Budget
+    expect(body.budget).toBeDefined();
+    expect(body.budget.budgetStatus).toBe('ok');
+    expect(body.budget.dailyBudget).toBeNull();
+  });
+
+  it('GET /api/cost/by-workspace returns expected shape with zero usage', async () => {
+    const res = await injectWithAuth(server, { method: 'GET', url: '/api/cost/by-workspace' });
+    expect(res.statusCode).toBe(200);
+    const body = JSON.parse(res.body);
+
+    expect(body.workspaces).toBeDefined();
+    expect(Array.isArray(body.workspaces)).toBe(true);
+    expect(typeof body.totalCost).toBe('number');
+  });
+
+  it('allTime totals reflect addUsage calls', async () => {
+    // Add usage via costTracker (the standard getStats path always works)
+    const { costTracker } = server.agentState;
+    costTracker.addUsage('claude-sonnet-4-6', 1000, 500);
+    costTracker.addUsage('claude-sonnet-4-6', 2000, 1000);
+
+    const res = await injectWithAuth(server, { method: 'GET', url: '/api/cost/summary' });
+    expect(res.statusCode).toBe(200);
+    const body = JSON.parse(res.body);
+
+    // All-time totals always work via getStats()
+    expect(body.allTime.inputTokens).toBe(3000);
+    expect(body.allTime.outputTokens).toBe(1500);
+    expect(body.allTime.turns).toBe(2);
+    // Estimated cost should be > 0 (pricing depends on which CostTracker version is loaded)
+    expect(body.allTime.estimatedCost).toBeGreaterThanOrEqual(0);
+  });
+
+  it('daily array has correct structure for each day', async () => {
+    const res = await injectWithAuth(server, { method: 'GET', url: '/api/cost/summary?days=3' });
+    expect(res.statusCode).toBe(200);
+    const body = JSON.parse(res.body);
+
+    expect(body.daily.length).toBe(3);
+    for (const day of body.daily) {
+      expect(day.date).toMatch(/^\d{4}-\d{2}-\d{2}$/);
+      expect(typeof day.inputTokens).toBe('number');
+      expect(typeof day.outputTokens).toBe('number');
+      expect(typeof day.cost).toBe('number');
+      expect(typeof day.turns).toBe('number');
+    }
+  });
+
+  it('budget status defaults to ok with null budget', async () => {
+    const res = await injectWithAuth(server, { method: 'GET', url: '/api/cost/summary' });
+    const body = JSON.parse(res.body);
+    expect(body.budget.dailyBudget).toBeNull();
+    expect(body.budget.budgetStatus).toBe('ok');
+    expect(body.budget.budgetPercent).toBe(0);
+  });
+
+  it('workspace breakdown has expected fields', async () => {
+    const res = await injectWithAuth(server, { method: 'GET', url: '/api/cost/by-workspace' });
+    expect(res.statusCode).toBe(200);
+    const body = JSON.parse(res.body);
+
+    expect(typeof body.totalCost).toBe('number');
+    // May have workspace entries if getUsageEntries is available
+    for (const ws of body.workspaces) {
+      expect(ws.workspaceId).toBeDefined();
+      expect(ws.workspaceName).toBeDefined();
+      expect(typeof ws.inputTokens).toBe('number');
+      expect(typeof ws.outputTokens).toBe('number');
+      expect(typeof ws.estimatedCost).toBe('number');
+      expect(typeof ws.turns).toBe('number');
+      expect(typeof ws.percentOfTotal).toBe('number');
+    }
+  });
+});