feat(cli): add "testsprite doctor" environment diagnostic

One-shot preflight: checks CLI version, Node runtime, profile, API endpoint,
credentials, live connectivity (GET /me), and verify-skill install. Prints an
OK/WARN/FAIL report and exits non-zero when any check fails, so it gates a CI
step or agent preflight. Reuses the real resolution helpers; the API key is
never printed.

Fixes #73

Author: Andy00L

src/commands/doctor.test.ts

@@ -0,0 +1,225 @@
+/**
+ * Unit tests for `testsprite doctor`.
+ *
+ * The command reuses the real resolution helpers (loadConfig, makeHttpClient,
+ * isVerifySkillInstalled), so these tests inject env/credentials/fetch/fs and
+ * assert on the rendered report + the exit-on-failure contract.
+ */
+
+import { mkdtempSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { CLIError } from '../lib/errors.js';
+import { writeProfile } from '../lib/credentials.js';
+import type { DoctorDeps, DoctorReport } from './doctor.js';
+import { createDoctorCommand, runDoctor } from './doctor.js';
+
+interface CapturedOutput {
+  stdout: string[];
+  stderr: string[];
+}
+
+function makeCapture(): { capture: CapturedOutput; deps: Pick<DoctorDeps, 'stdout' | 'stderr'> } {
+  const capture: CapturedOutput = { stdout: [], stderr: [] };
+  return {
+    capture,
+    deps: {
+      stdout: line => capture.stdout.push(line),
+      stderr: line => capture.stderr.push(line),
+    },
+  };
+}
+
+function makeFetch(body: unknown, status = 200): DoctorDeps['fetchImpl'] {
+  return vi.fn(
+    async () =>
+      new Response(JSON.stringify(body), {
+        status,
+        headers: { 'content-type': 'application/json' },
+      }),
+  ) as unknown as DoctorDeps['fetchImpl'];
+}
+
+const OK_ME = { userId: 'u-doc', keyId: 'k-doc' };
+
+/** Base deps shared by the healthy-path tests: node OK, skill installed, empty env. */
+function healthyDeps(credentialsPath: string, extra: Partial<DoctorDeps> = {}): DoctorDeps {
+  return {
+    env: {},
+    credentialsPath,
+    cwd: '/project',
+    nodeVersion: '22.9.0',
+    existsSync: () => true, // skill landing file present
+    fetchImpl: makeFetch(OK_ME),
+    ...extra,
+  };
+}
+
+let credentialsPath: string;
+
+beforeEach(() => {
+  credentialsPath = join(mkdtempSync(join(tmpdir(), 'testsprite-doctor-')), 'credentials');
+});
+
+describe('runDoctor — healthy environment', () => {
+  it('returns an all-passing report and does not throw', async () => {
+    writeProfile('default', { apiKey: 'sk-abc' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    const report = await runDoctor(
+      { profile: 'default', output: 'text', debug: false },
+      { ...healthyDeps(credentialsPath), ...deps },
+    );
+    expect(report.failures).toBe(0);
+    expect(report.warnings).toBe(0);
+    const out = capture.stdout.join('\n');
+    expect(out).toContain('[OK]');
+    expect(out).toContain('All checks passed.');
+    expect(out).toContain('reached GET /me');
+  });
+
+  it('never prints the API key anywhere in the report', async () => {
+    writeProfile('default', { apiKey: 'sk-super-secret-value' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    await runDoctor(
+      { profile: 'default', output: 'text', debug: false },
+      { ...healthyDeps(credentialsPath), ...deps },
+    );
+    const all = capture.stdout.join('\n') + capture.stderr.join('\n');
+    expect(all).not.toContain('sk-super-secret-value');
+  });
+
+  it('emits a machine-readable report under --output json', async () => {
+    writeProfile('default', { apiKey: 'sk-abc' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    await runDoctor(
+      { profile: 'default', output: 'json', debug: false },
+      { ...healthyDeps(credentialsPath), ...deps },
+    );
+    const parsed = JSON.parse(capture.stdout.join('')) as DoctorReport;
+    expect(parsed.failures).toBe(0);
+    expect(Array.isArray(parsed.checks)).toBe(true);
+    expect(
+      parsed.checks.some(check => check.name === 'Connectivity' && check.status === 'ok'),
+    ).toBe(true);
+  });
+});
+
+describe('runDoctor — failing checks exit non-zero', () => {
+  it('missing API key fails Credentials and throws CLIError (exit 1)', async () => {
+    const { capture, deps } = makeCapture();
+    const rejection = await runDoctor(
+      { profile: 'default', output: 'text', debug: false },
+      { ...healthyDeps(credentialsPath), ...deps }, // no profile written => no key
+    ).catch((error: unknown) => error);
+    expect(rejection).toBeInstanceOf(CLIError);
+    expect(rejection).toMatchObject({ exitCode: 1 });
+    const out = capture.stdout.join('\n');
+    expect(out).toContain('[FAIL]');
+    expect(out).toContain('Credentials');
+  });
+
+  it('invalid endpoint URL fails the API endpoint check', async () => {
+    writeProfile('default', { apiKey: 'sk-abc' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    const rejection = await runDoctor(
+      { profile: 'default', output: 'text', debug: false, endpointUrl: 'not-a-url' },
+      { ...healthyDeps(credentialsPath), ...deps },
+    ).catch((error: unknown) => error);
+    expect(rejection).toBeInstanceOf(CLIError);
+    const out = capture.stdout.join('\n');
+    expect(out).toContain('API endpoint');
+    expect(out).toContain('not a valid');
+  });
+
+  it('rejected API key surfaces as a Connectivity failure', async () => {
+    writeProfile('default', { apiKey: 'sk-bad' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    const authError = {
+      error: { code: 'AUTH_INVALID', message: 'Bad key.', requestId: 'req_x', details: {} },
+    };
+    const rejection = await runDoctor(
+      { profile: 'default', output: 'text', debug: false },
+      { ...healthyDeps(credentialsPath, { fetchImpl: makeFetch(authError, 401) }), ...deps },
+    ).catch((error: unknown) => error);
+    expect(rejection).toBeInstanceOf(CLIError);
+    const out = capture.stdout.join('\n');
+    expect(out).toContain('Connectivity');
+    expect(out).toContain('API key rejected (AUTH_INVALID)');
+  });
+
+  it('a non-auth /me error is reported as a Connectivity failure with its code', async () => {
+    writeProfile('default', { apiKey: 'sk-abc' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    const notFound = {
+      error: { code: 'NOT_FOUND', message: 'nope', requestId: 'req_y', details: {} },
+    };
+    const rejection = await runDoctor(
+      { profile: 'default', output: 'text', debug: false },
+      { ...healthyDeps(credentialsPath, { fetchImpl: makeFetch(notFound, 404) }), ...deps },
+    ).catch((error: unknown) => error);
+    expect(rejection).toBeInstanceOf(CLIError);
+    expect(capture.stdout.join('\n')).toContain('GET /me failed (NOT_FOUND)');
+  });
+
+  it('an outdated Node runtime fails the Node.js check', async () => {
+    writeProfile('default', { apiKey: 'sk-abc' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    const rejection = await runDoctor(
+      { profile: 'default', output: 'text', debug: false },
+      { ...healthyDeps(credentialsPath, { nodeVersion: '18.0.0' }), ...deps },
+    ).catch((error: unknown) => error);
+    expect(rejection).toBeInstanceOf(CLIError);
+    const out = capture.stdout.join('\n');
+    expect(out).toContain('Node.js');
+    expect(out).toContain('below the required Node 20');
+  });
+});
+
+describe('runDoctor — warnings do not fail', () => {
+  it('missing verify skill is a warning, not a failure', async () => {
+    writeProfile('default', { apiKey: 'sk-abc' }, { path: credentialsPath });
+    const { capture, deps } = makeCapture();
+    const report = await runDoctor(
+      { profile: 'default', output: 'text', debug: false },
+      { ...healthyDeps(credentialsPath, { existsSync: () => false }), ...deps },
+    );
+    expect(report.failures).toBe(0);
+    expect(report.warnings).toBeGreaterThanOrEqual(1);
+    const out = capture.stdout.join('\n');
+    expect(out).toContain('[WARN]');
+    expect(out).toContain('Verify skill');
+  });
+
+  it('--dry-run skips connectivity and never calls fetch, missing key is a warning', async () => {
+    const fetchImpl = vi.fn(async () => {
+      throw new Error('fetch must not be called under --dry-run');
+    }) as unknown as DoctorDeps['fetchImpl'];
+    const { capture, deps } = makeCapture();
+    const report = await runDoctor(
+      { profile: 'default', output: 'text', debug: false, dryRun: true },
+      {
+        env: {},
+        credentialsPath,
+        cwd: '/project',
+        nodeVersion: '22.9.0',
+        existsSync: () => true,
+        fetchImpl,
+        ...deps,
+      },
+    );
+    expect(report.failures).toBe(0);
+    expect(fetchImpl).not.toHaveBeenCalled();
+    expect(capture.stdout.join('\n')).toContain('skipped under --dry-run');
+  });
+});
+
+describe('createDoctorCommand wiring', () => {
+  it('exposes the doctor command name', () => {
+    expect(createDoctorCommand().name()).toBe('doctor');
+  });
+
+  it('--help describes the diagnostic', () => {
+    expect(createDoctorCommand().helpInformation()).toContain('Diagnose');
+  });
+});