[processor/tailsampling] Cleanly tear down test (#9283)

* [processor/tailsampling] Cleanly tear down test

Signed-off-by: Juraci Paixão Kröhling <juraci@kroehling.de>

* Move goleaks to main require section

Signed-off-by: Juraci Paixão Kröhling <juraci@kroehling.de>

processor/tailsamplingprocessor/factory_test.go

@@ -52,4 +52,9 @@ func TestCreateProcessor(t *testing.T) {
 	tp, err := factory.CreateTracesProcessor(context.Background(), params, cfg, consumertest.NewNop())
 	assert.NotNil(t, tp)
 	assert.NoError(t, err, "cannot create trace processor")
+
+	// this will cause the processor to properly initialize, so that we can later shutdown and
+	// have all the go routines cleanly shut down
+	assert.NoError(t, tp.Start(context.Background(), componenttest.NewNopHost()))
+	assert.NoError(t, tp.Shutdown(context.Background()))
 }

processor/tailsamplingprocessor/go.mod

@@ -10,8 +10,8 @@ require (
 	go.opencensus.io v0.23.0
 	go.opentelemetry.io/collector v0.49.0
 	go.opentelemetry.io/collector/pdata v0.49.0
+	go.uber.org/goleak v1.1.11
 	go.uber.org/zap v1.21.0
-
 )
 
 require (
@@ -29,6 +29,7 @@ require (
 	go.opentelemetry.io/otel/trace v1.6.3 // indirect
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.8.0 // indirect
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )