diff --git a/ethutil/bytes_test.go b/ethutil/bytes_test.go
index 381efe7a2..27b31c0c8 100644
--- a/ethutil/bytes_test.go
+++ b/ethutil/bytes_test.go
@@ -12,3 +12,63 @@ func TestParseData(t *testing.T) {
 		t.Error("Error parsing data")
 	}
 }
+
+func TestLeftPadBytes(t *testing.T) {
+	val := []byte{1, 2, 3, 4}
+	exp := []byte{0, 0, 0, 0, 1, 2, 3, 4}
+
+	resstd := LeftPadBytes(val, 8)
+	if bytes.Compare(resstd, exp) != 0 {
+		t.Errorf("Expected % x Got % x", exp, resstd)
+	}
+
+	resshrt := LeftPadBytes(val, 2)
+	if bytes.Compare(resshrt, val) != 0 {
+		t.Errorf("Expected % x Got % x", exp, resshrt)
+	}
+}
+
+func TestRightPadBytes(t *testing.T) {
+	val := []byte{1, 2, 3, 4}
+	exp := []byte{1, 2, 3, 4, 0, 0, 0, 0}
+
+	resstd := RightPadBytes(val, 8)
+	if bytes.Compare(resstd, exp) != 0 {
+		t.Errorf("Expected % x Got % x", exp, resstd)
+	}
+
+	resshrt := RightPadBytes(val, 2)
+	if bytes.Compare(resshrt, val) != 0 {
+		t.Errorf("Expected % x Got % x", exp, resshrt)
+	}
+}
+
+func TestLeftPadString(t *testing.T) {
+	val := "test"
+
+	resstd := LeftPadString(val, 8)
+
+	if resstd != "\x30\x30\x30\x30"+val {
+		t.Errorf("Expected % x Got % x", val, resstd)
+	}
+
+	resshrt := LeftPadString(val, 2)
+
+	if resshrt != val {
+		t.Errorf("Expected % x Got % x", val, resshrt)
+	}
+}
+
+func TestRightPadString(t *testing.T) {
+	val := "test"
+
+	resstd := RightPadString(val, 8)
+	if resstd != val+"\x30\x30\x30\x30" {
+		t.Errorf("Expected % x Got % x", val, resstd)
+	}
+
+	resshrt := RightPadString(val, 2)
+	if resshrt != val {
+		t.Errorf("Expected % x Got % x", val, resshrt)
+	}
+}