diff --git a/revid/revid_test.go b/revid/revid_test.go
index 269718a7..14519fd8 100644
--- a/revid/revid_test.go
+++ b/revid/revid_test.go
@@ -1,7 +1,6 @@
 package revid
 
 import (
-	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -100,11 +99,11 @@ func (e *tstFlvEncoder) Write(d []byte) (int, error) { return 0, nil }
 func TestResetEncoderSenderSetup(t *testing.T) {
 	// We will use these to indicate types after assertion.
 	const (
-		mtsSenderStr  = "revid.mtsSender"
-		rtpSenderStr  = "revid.rtpSender"
-		rtmpSenderStr = "revid.RtmpSender"
-		mtsEncoderStr = "mts.Encoder"
-		flvEncoderStr = "flv.Encoder"
+		mtsSenderStr  = "*revid.mtsSender"
+		rtpSenderStr  = "*revid.rtpSender"
+		rtmpSenderStr = "*revid.rtmpSender"
+		mtsEncoderStr = "*revid.tstMtsEncoder"
+		flvEncoderStr = "*revid.tstFlvEncoder"
 	)
 
 	// Struct that will be used to format test cases nicely below.
@@ -185,31 +184,6 @@ func TestResetEncoderSenderSetup(t *testing.T) {
 		},
 	}
 
-	// typeOfEncoder will return the type of encoder implementing stream.Encoder.
-	typeOfEncoder := func(i io.Writer) (string, error) {
-		if _, ok := i.(*tstMtsEncoder); ok {
-			return mtsEncoderStr, nil
-		}
-		if _, ok := i.(*tstFlvEncoder); ok {
-			return flvEncoderStr, nil
-		}
-		return "", errors.New("unknown Encoder type")
-	}
-
-	// typeOfSender will return the type of sender implementing loadSender.
-	typeOfSender := func(s loadSender) (string, error) {
-		if _, ok := s.(*mtsSender); ok {
-			return mtsSenderStr, nil
-		}
-		if _, ok := s.(*rtpSender); ok {
-			return rtpSenderStr, nil
-		}
-		if _, ok := s.(*rtmpSender); ok {
-			return rtmpSenderStr, nil
-		}
-		return "", errors.New("unknown loadSender type")
-	}
-
 	rv, err := New(Config{Logger: &testLogger{}}, nil)
 	if err != nil {
 		t.Fatalf("unexpected err: %v", err)
@@ -241,10 +215,7 @@ func TestResetEncoderSenderSetup(t *testing.T) {
 		// Now check the correctness of encoders and their destinations.
 		for _, e := range rv.encoder {
 			// Get e's type.
-			encoderType, err := typeOfEncoder(e)
-			if err != nil {
-				t.Fatalf("could not get encoders type for test %v, failed with err: %v", testNum, err)
-			}
+			encoderType := fmt.Sprintf("%T", e)
 
 			// Check that we expect this encoder to be here.
 			idx := -1
@@ -278,10 +249,7 @@ func TestResetEncoderSenderSetup(t *testing.T) {
 				ok := false
 				for _, dst := range senders {
 					// Get type of sender.
-					senderType, err := typeOfSender(dst.(loadSender))
-					if err != nil {
-						t.Fatalf("could not get encoders type for test %v, failed with err: %v", testNum, err)
-					}
+					senderType := fmt.Sprintf("%T", dst.(loadSender))
 
 					// If it's one we want, indicate.
 					if senderType == expectDst {