diff --git a/protocol/version_test.go b/protocol/version_test.go
index 6b2e71b7..470eceac 100644
--- a/protocol/version_test.go
+++ b/protocol/version_test.go
@@ -21,4 +21,9 @@ var _ = Describe("Version", func() {
 	It("has proper tag list", func() {
 		Expect(protocol.SupportedVersionsAsTags).To(Equal([]byte("Q030Q032")))
 	})
+
+	It("recognizes supported versions", func() {
+		Expect(protocol.IsSupportedVersion(0)).To(BeFalse())
+		Expect(protocol.IsSupportedVersion(protocol.SupportedVersions[0])).To(BeTrue())
+	})
 })
diff --git a/utils/utils.go b/utils/utils.go
index d5f1dfce..26d3a093 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -6,7 +6,6 @@ import (
 )
 
 // ReadUintN reads N bytes
-// ToDo: add tests
 func ReadUintN(b io.ByteReader, length uint8) (uint64, error) {
 	var res uint64
 	for i := uint8(0); i < length; i++ {
diff --git a/utils/utils_test.go b/utils/utils_test.go
index da4881d3..3446a563 100644
--- a/utils/utils_test.go
+++ b/utils/utils_test.go
@@ -94,4 +94,25 @@ var _ = Describe("Utils", func() {
 			Expect(Min(5, 7)).To(Equal(5))
 		})
 	})
+
+	Context("ReadUintN", func() {
+		It("reads n bytes", func() {
+			m := map[uint8]uint64{
+				0: 0x0, 1: 0x01, 2: 0x0201, 3: 0x030201, 4: 0x04030201, 5: 0x0504030201,
+				6: 0x060504030201, 7: 0x07060504030201, 8: 0x0807060504030201,
+			}
+			for n, expected := range m {
+				b := bytes.NewReader([]byte{0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8})
+				i, err := ReadUintN(b, n)
+				Expect(err).ToNot(HaveOccurred())
+				Expect(i).To(Equal(expected))
+			}
+		})
+
+		It("errors", func() {
+			b := bytes.NewReader([]byte{0x1, 0x2})
+			_, err := ReadUintN(b, 3)
+			Expect(err).To(HaveOccurred())
+		})
+	})
 })