Make sure option is set correctly

Author: AbhiPrasad

packages/tracing/src/browser/browsertracing.ts

@@ -149,7 +149,7 @@ export class BrowserTracing implements Integration {
       tracingOrigins,
     };
 
-    this._metrics = new MetricsInstrumentation({ ...this.options._metricOptions, ...DEFAULT_METRICS_INSTR_OPTIONS });
+    this._metrics = new MetricsInstrumentation({ ...DEFAULT_METRICS_INSTR_OPTIONS, ...this.options._metricOptions });
   }
 
   /**

packages/tracing/test/browser/browsertracing.test.ts

@@ -11,6 +11,7 @@ import {
   getHeaderContext,
   getMetaContent,
 } from '../../src/browser/browsertracing';
+import { DEFAULT_METRICS_INSTR_OPTIONS, MetricsInstrumentation } from '../../src/browser/metrics';
 import { defaultRequestInstrumentationOptions } from '../../src/browser/request';
 import { instrumentRoutingWithDefaults } from '../../src/browser/router';
 import * as hubExtensions from '../../src/hubextensions';
@@ -32,6 +33,8 @@ jest.mock('@sentry/utils', () => {
   };
 });
 
+jest.mock('../../src/browser/metrics');
+
 const { logger } = jest.requireActual('@sentry/utils');
 const warnSpy = jest.spyOn(logger, 'warn');
 
@@ -493,4 +496,31 @@ describe('BrowserTracing', () => {
       );
     });
   });
+
+  describe('metrics', () => {
+    beforeEach(() => {
+      // @ts-ignore mock clear
+      MetricsInstrumentation.mockClear();
+    });
+
+    it('creates metrics instrumentation', () => {
+      createBrowserTracing(true, {});
+
+      expect(MetricsInstrumentation).toHaveBeenCalledTimes(1);
+      expect(MetricsInstrumentation).toHaveBeenLastCalledWith(DEFAULT_METRICS_INSTR_OPTIONS);
+    });
+
+    it('creates metrics instrumentation with custom options', () => {
+      createBrowserTracing(true, {
+        _metricOptions: {
+          _reportAllChanges: true,
+        },
+      });
+
+      expect(MetricsInstrumentation).toHaveBeenCalledTimes(1);
+      expect(MetricsInstrumentation).toHaveBeenLastCalledWith({
+        _reportAllChanges: true,
+      });
+    });
+  });
 });