066e482f06
Single file, no transport, writes one JSON line per call to stdout. Child loggers inherit parent meta so scenarios can bind room/game context once and forget about it. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
import { describe, it, expect, beforeEach } from 'vitest';
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import { createLogger } from '../core/logger';
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describe('logger', () => {
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let writes: string[];
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let write: (s: string) => boolean;
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beforeEach(() => {
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writes = [];
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write = (s: string) => {
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writes.push(s);
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return true;
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};
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});
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it('emits a JSON line per call with level and msg', () => {
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const log = createLogger({ runId: 'r1', write });
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log.info('hello');
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expect(writes).toHaveLength(1);
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const parsed = JSON.parse(writes[0]);
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expect(parsed.level).toBe('info');
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expect(parsed.msg).toBe('hello');
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expect(parsed.runId).toBe('r1');
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expect(parsed.timestamp).toBeTypeOf('string');
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});
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it('merges meta into the log line', () => {
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const log = createLogger({ runId: 'r1', write });
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log.warn('slow', { turnMs: 3000 });
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const parsed = JSON.parse(writes[0]);
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expect(parsed.turnMs).toBe(3000);
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expect(parsed.level).toBe('warn');
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});
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it('child logger inherits parent meta', () => {
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const log = createLogger({ runId: 'r1', write });
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const roomLog = log.child({ room: 'room-1' });
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roomLog.info('game_start');
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const parsed = JSON.parse(writes[0]);
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expect(parsed.room).toBe('room-1');
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expect(parsed.runId).toBe('r1');
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});
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it('respects minimum level', () => {
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const log = createLogger({ runId: 'r1', write, minLevel: 'warn' });
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log.debug('nope');
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log.info('nope');
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log.warn('yes');
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log.error('yes');
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expect(writes).toHaveLength(2);
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});
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});
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