Adds unit tests

1 files changed, 55 insertions, 0 deletions

diff --git a/tst/log_trace.test.ts b/tst/log_trace.test.ts
new file mode 100644
index 0000000..29234f6
--- /dev/null
+++ b/tst/log_trace.test.ts
@@ -0,0 +1,55 @@
+import { LogLevel, LogTrace, type ILogger } from '../lib/index';
+
+describe('trace/log/trace (LogTrace)', () => {
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.setSystemTime(new Date('2020-01-01T00:00:00.000Z'));
+    });
+
+    afterEach(() => {
+        jest.useRealTimers();
+    });
+
+    test('uses defaultLevel when no explicit level', () => {
+        const logger: ILogger = { log: jest.fn() };
+        const allowed = () => new Set([LogLevel.UNKNOWN, LogLevel.WARN]);
+        const trace = new LogTrace(logger, [], LogLevel.WARN, allowed);
+
+        trace.trace('hello');
+        expect(logger.log).toHaveBeenCalledTimes(1);
+
+        const [level, ...rest] = (logger.log as jest.Mock).mock.calls[0];
+        expect(level).toBe(LogLevel.WARN);
+        expect(rest.join(' ')).toContain('hello');
+    });
+
+    test('picks highest log level across traces', () => {
+        const logger: ILogger = { log: jest.fn() };
+        const allowed = () => new Set([LogLevel.UNKNOWN, LogLevel.INFO, LogLevel.WARN, LogLevel.ERROR]);
+        const trace = new LogTrace(logger, [], LogLevel.INFO, allowed);
+
+        trace.traceScope(LogLevel.INFO).traceScope(LogLevel.ERROR).trace('boom');
+        const [level] = (logger.log as jest.Mock).mock.calls[0];
+        expect(level).toBe(LogLevel.ERROR);
+    });
+
+    test('filters disallowed levels', () => {
+        const logger: ILogger = { log: jest.fn() };
+        const allowed = () => new Set([LogLevel.UNKNOWN, LogLevel.INFO]);
+        const trace = new LogTrace(logger, [], LogLevel.INFO, allowed);
+
+        trace.traceScope(LogLevel.DEBUG).trace('nope');
+        expect(logger.log).not.toHaveBeenCalled();
+    });
+
+    test('formats Error objects in trace', () => {
+        const logger: ILogger = { log: jest.fn() };
+        const allowed = () => new Set([LogLevel.UNKNOWN, LogLevel.ERROR]);
+        const trace = new LogTrace(logger, [], LogLevel.INFO, allowed);
+
+        trace.traceScope(LogLevel.ERROR).trace(new Error('boom'));
+        const [_level, msg] = (logger.log as jest.Mock).mock.calls[0];
+        expect(msg).toContain('TracedException.Name = Error');
+        expect(msg).toContain('TracedException.Message = boom');
+    });
+});