test: add t.Helper() calls to test helper functions (#7351)

plugin/pkg/log/listener_test.go

@@ -43,6 +43,7 @@ func TestMultipleListenerMock(t *testing.T) {
 }
 
 func testListenersCalled(t *testing.T, listenerNames []string, outputs []string) {
+	t.Helper()
 	for _, name := range listenerNames {
 		err := RegisterListener(NewMockListener(name))
 		if err != nil {

plugin/pkg/tls/tls_test.go

@@ -8,6 +8,7 @@ import (
 )
 
 func getPEMFiles(t *testing.T) (cert, key, ca string) {
+	t.Helper()
 	tempDir, err := test.WritePEMFiles(t)
 	if err != nil {
 		t.Fatalf("Could not write PEM files: %s", err)