feat(UMetrics): add prefix and nodejsMetricsEnabled options to facade

src/UMetrics.js

@@ -7,13 +7,18 @@ import Transport from './transport/Transport';
  * @property {MetricRegistry} registry
  */
 class UMetrics {
-  constructor(transport, { prefix, labels } = {}) {
+  constructor(
+    transport,
+    { prefix = null, labels, nodejsMetricsEnabled = false } = {},
+  ) {
     if (!transport || !(transport instanceof Transport)) {
       throw new Error(
         'Transport must be provided and be instance of Transport',
       );
     }
 
+    this.nodejsMetricsEnabled = nodejsMetricsEnabled;
+    this.prefix = prefix;
     this.transport = transport;
     this.registry = new MetricRegistry({
       prefix,

src/UMetrics.server.test.js

@@ -31,4 +31,22 @@ describe('UMetrics facade', () => {
     const realMetric = uMetrics.register(uMetrics.Metrics.Gauge, 'testMetric');
     expect(uMetrics.testMetric).to.be.equals(realMetric);
   });
+
+  it('Should have defaultMetrics disabled by default', () => {
+    const uMetrics = new UMetrics(new Transport(), { port: 1111 });
+    expect(uMetrics.nodejsMetricsEnabled).to.be.false;
+  });
+
+  it('Should have metricsPrefix options null by default', () => {
+    const uMetrics = new UMetrics(new Transport(), { port: 1111 });
+    expect(uMetrics.prefix).to.be.null;
+  });
+
+  it('Should change metricsPrefix options', () => {
+    const uMetrics = new UMetrics(new Transport(), {
+      port: 1111,
+      prefix: 'test',
+    });
+    expect(uMetrics.prefix).to.be.equals('test');
+  });
 });