Fix test

Author: kislaykishore

internal/fs/wrappers/monitoring.go

@@ -320,6 +320,7 @@ func WithMonitoring(fs fuseutil.FileSystem) fuseutil.FileSystem {
 
 type monitoring struct {
 	wrapped fuseutil.FileSystem
+	tracer  trace.Tracer
 }
 
 func (fs *monitoring) Destroy() {

internal/fs/wrappers/monitoring_test.go

@@ -20,6 +20,7 @@ import (
 	"syscall"
 	"testing"
 
+	"github.com/googlecloudplatform/gcsfuse/v2/internal/monitor"
 	"github.com/jacobsa/fuse/fuseops"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -113,6 +114,7 @@ func newInMemoryExporter(t *testing.T) *tracetest.InMemoryExporter {
 		ex.Reset()
 	})
 	otel.SetTracerProvider(sdktrace.NewTracerProvider(sdktrace.WithSyncer(ex)))
+	monitor.ResetTracer()
 	return ex
 }
 
@@ -236,8 +238,11 @@ func (d dummyFS) Fallocate(_ context.Context, _ *fuseops.FallocateOp) error {
 
 func (d dummyFS) Destroy() {}
 
-func TestSpan(t *testing.T) {
+func TestSpanCreation(t *testing.T) {
 	ex := newInMemoryExporter(t)
+	t.Cleanup(func() {
+		ex.Reset()
+	})
 	m := monitoring{
 		wrapped: dummyFS{},
 	}

internal/monitor/trace.go

@@ -26,13 +26,20 @@ import (
 // TODO: name is subject to change.
 const name = "cloud.google.com/gcsfuse"
 
-var tracerProvider trace.TracerProvider = noop.NewTracerProvider()
-var once sync.Once
+var (
+	tracer = noop.NewTracerProvider().Tracer("noop")
+	once   sync.Once
+)
 
 // StartSpan creates a new span and returns it along with the context that's augmented with the newly-created span..
 func StartSpan(ctx context.Context, spanName string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
 	once.Do(func() {
-		tracerProvider = otel.GetTracerProvider()
+		// Expect that the tracer provider has been configured by the SDK before the first call to StartSpan is made.
+		ResetTracer()
 	})
-	return tracerProvider.Tracer(name).Start(ctx, spanName, opts...)
+	return tracer.Start(ctx, spanName, opts...)
+}
+
+func ResetTracer() {
+	tracer = otel.GetTracerProvider().Tracer(name)
 }