[chore][processor/cumulativetodeltaprocessor] Enable goleak check

processor/cumulativetodeltaprocessor/factory_test.go

@@ -62,6 +62,7 @@ func TestCreateProcessors(t *testing.T) {
 				consumertest.NewNop())
 			assert.NotNil(t, mp)
 			assert.NoError(t, mErr)
+			assert.NoError(t, mp.Shutdown(context.Background()))
 		})
 	}
 }

processor/cumulativetodeltaprocessor/package_test.go

@@ -0,0 +1,17 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package cumulativetodeltaprocessor
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+// The IgnoreTopFunction call prevents catching the leak generated by opencensus
+// defaultWorker.Start which at this time is part of the package's init call.
+// See https://github.com/census-instrumentation/opencensus-go/issues/1191 for more information.
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m, goleak.IgnoreTopFunction("go.opencensus.io/stats/view.(*worker).start"))
+}