1 files changed, 53 insertions, 0 deletions
diff --git a/tst/metric.test.ts b/tst/metric.test.ts
new file mode 100644
index 0000000..b55be40
--- /dev/null
+++ b/tst/metric.test.ts
@@ -0,0 +1,53 @@
+import { EmittableMetric, Metric, MetricValueTag, ResultMetric, Unit, isIMetric, isMetricValue } from '../lib/index';
+
+describe('trace/metric', () => {
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.setSystemTime(new Date('2020-01-01T00:00:00.000Z'));
+    });
+
+    afterEach(() => {
+        jest.useRealTimers();
+    });
+
+    test('EmittableMetric.withValue creates MetricValue', () => {
+        const m = new EmittableMetric('x', Unit.COUNT);
+        const v = m.withValue(2.5);
+        expect(isMetricValue(v)).toBe(true);
+        expect(v).toEqual({
+            _tag: MetricValueTag,
+            name: 'x',
+            unit: Unit.COUNT,
+            value: 2.5,
+            emissionTimestamp: 1577836800000,
+        });
+    });
+
+    test('Metric.join/fromName/child set names and parents', () => {
+        expect(Metric.join('a', 'b', 'c')).toBe('a.b.c');
+
+        const root = Metric.fromName('root');
+        expect(isIMetric(root)).toBe(true);
+        expect(root.count.name).toBe('root.count');
+        expect(root.time.name).toBe('root.time');
+        expect(root.parent).toBeUndefined();
+
+        const child = root.child('leaf');
+        expect(child.name).toBe('root.leaf');
+        expect(child.parent).toBe(root);
+    });
+
+    test('ResultMetric.from creates failure/success/warn children', () => {
+        const metric = Metric.fromName('work');
+        const result = ResultMetric.from(metric);
+
+        expect(result.name).toBe('work');
+        expect(result.failure.name).toBe('work.failure');
+        expect(result.success.name).toBe('work.success');
+        expect(result.warn.name).toBe('work.warn');
+
+        expect(result.failure.parent!.name).toBe('work');
+        expect(result.success.parent!.name).toBe('work');
+        expect(result.warn.parent!.name).toBe('work');
+    });
+});