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import { Metric, MetricsTrace, MetricValueTag, isMetricsTraceSupplier, type MetricValue } from '../lib/index';
describe('trace/metric/trace (MetricsTrace)', () => {
beforeEach(() => {
jest.useFakeTimers();
jest.setSystemTime(new Date('2020-01-01T00:00:00.000Z'));
});
afterEach(() => {
jest.useRealTimers();
});
test('isMetricsTraceSupplier accepts metrics and values', () => {
const m = Metric.fromName('m');
const v = m.count.withValue(1);
expect(isMetricsTraceSupplier(m)).toBe(true);
expect(isMetricsTraceSupplier(v)).toBe(true);
expect(isMetricsTraceSupplier([m, v])).toBe(true);
expect(isMetricsTraceSupplier('nope')).toBe(false);
expect(isMetricsTraceSupplier(undefined)).toBe(false);
});
test('traceScope + trace ends a metric and emits count/time', () => {
const emitted: MetricValue[] = [];
const consumer = (vals: MetricValue[]) => emitted.push(...vals);
const metric = Metric.fromName('A');
const t0 = new MetricsTrace(consumer).traceScope(metric);
jest.setSystemTime(new Date('2020-01-01T00:00:00.100Z'));
t0.trace(metric);
expect(emitted).toEqual(
expect.arrayContaining([
expect.objectContaining({ _tag: MetricValueTag, name: 'A.count', value: 1 }),
expect.objectContaining({ _tag: MetricValueTag, name: 'A.time', value: 100 }),
]),
);
});
test('trace does not emit when given string/undefined', () => {
const emitted: MetricValue[] = [];
const consumer = (vals: MetricValue[]) => emitted.push(...vals);
const t = new MetricsTrace(consumer);
t.trace(undefined);
t.trace('hello');
expect(emitted).toEqual([]);
});
test('parent-based metric emits relative to parent start', () => {
const emitted: MetricValue[] = [];
const consumer = (vals: MetricValue[]) => emitted.push(...vals);
const parent = Metric.fromName('parent');
const child = parent.child('child');
const t0 = new MetricsTrace(consumer).traceScope(parent);
jest.setSystemTime(new Date('2020-01-01T00:00:00.050Z'));
const t1 = t0.trace(child);
expect(emitted).toEqual(
expect.arrayContaining([
expect.objectContaining({ name: 'parent.child.count', value: 1 }),
expect.objectContaining({ name: 'parent.child.time', value: 50 }),
]),
);
// end parent normally
jest.setSystemTime(new Date('2020-01-01T00:00:00.080Z'));
t1.trace(parent);
expect(emitted).toEqual(
expect.arrayContaining([
expect.objectContaining({ name: 'parent.count', value: 1 }),
expect.objectContaining({ name: 'parent.time', value: 80 }),
]),
);
// child should be considered completed already
const before = emitted.length;
jest.setSystemTime(new Date('2020-01-01T00:00:00.100Z'));
t1.trace(child);
expect(emitted.length).toBe(before);
});
test('nested scope can end parent metric via result child', () => {
const emitted: MetricValue[] = [];
const consumer = (vals: MetricValue[]) => emitted.push(...vals);
const result = Metric.fromName('job').asResult();
const root = new MetricsTrace(consumer).traceScope(result);
jest.setSystemTime(new Date('2020-01-01T00:00:00.100Z'));
const child = root.traceScope('child-scope');
const childAfterSuccess = child.trace(result.success);
expect(emitted).toEqual(
expect.arrayContaining([
expect.objectContaining({ name: 'job.success.count', value: 1 }),
expect.objectContaining({ name: 'job.success.time', value: 100 }),
]),
);
const before = emitted.length;
jest.setSystemTime(new Date('2020-01-01T00:00:00.200Z'));
childAfterSuccess.trace(result.success);
expect(emitted.length).toBe(before);
});
test('trace forwards MetricValue emissions unchanged', () => {
const emitted: MetricValue[] = [];
const consumer = (vals: MetricValue[]) => emitted.push(...vals);
const metric = Metric.fromName('X');
const value = metric.count.withValue(7);
const t = new MetricsTrace(consumer);
t.trace(value);
expect(emitted).toEqual([value]);
});
});
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