moving

packages/hive-mind-core/tests/logger.test.ts

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+/**
+ * Logger stderr-routing tests.
+ *
+ * Reverse-ported from OSS hive-mind (oss-drift triage R1, 2026-06-11).
+ * stdout is reserved for program data (MCP stdio transport in
+ * hive-mind-mcp-server, CLI --json envelopes) — a library log line on
+ * stdout corrupts machine consumers, so every level must land on stderr.
+ */
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { createCoreLogger, type CoreLogger } from '../src/logger.js';
+
+describe('createCoreLogger', () => {
+  afterEach(() => vi.restoreAllMocks());
+
+  it('routes every level to stderr — never the stdout-bound console methods', () => {
+    const info = vi.spyOn(console, 'info').mockImplementation(() => {});
+    const debug = vi.spyOn(console, 'debug').mockImplementation(() => {});
+    const log = vi.spyOn(console, 'log').mockImplementation(() => {});
+    const error = vi.spyOn(console, 'error').mockImplementation(() => {});
+    const warn = vi.spyOn(console, 'warn').mockImplementation(() => {});
+
+    const logger: CoreLogger = createCoreLogger('test');
+    logger.info('hello');
+    logger.debug('dbg');
+    logger.warn('careful');
+    logger.error('boom');
+
+    // None of the stdout-bound console methods may be used.
+    expect(info).not.toHaveBeenCalled();
+    expect(debug).not.toHaveBeenCalled();
+    expect(log).not.toHaveBeenCalled();
+    // Diagnostics land on stderr (console.error / console.warn).
+    expect(error).toHaveBeenCalledTimes(3); // info + debug + error
+    expect(warn).toHaveBeenCalledTimes(1);
+  });
+
+  it('keeps the [waggle:tag] prefix on messages', () => {
+    const error = vi.spyOn(console, 'error').mockImplementation(() => {});
+    createCoreLogger('embedding').info('probing');
+    expect(error).toHaveBeenCalledWith('[waggle:embedding] probing');
+  });
+
+  it('passes structured data through as a second argument', () => {
+    const error = vi.spyOn(console, 'error').mockImplementation(() => {});
+    createCoreLogger('pipeline').info('done', { frames: 5 });
+    expect(error).toHaveBeenCalledWith('[waggle:pipeline] done', { frames: 5 });
+  });
+});