diff --git a/types/store_test.go b/types/store_test.go
new file mode 100644
index 000000000000..2fd94418527e
--- /dev/null
+++ b/types/store_test.go
@@ -0,0 +1,28 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPrefixEndBytes(t *testing.T) {
+	assert := assert.New(t)
+
+	var testCases = []struct {
+		prefix   []byte
+		expected []byte
+	}{
+		{[]byte{byte(55), byte(255), byte(255), byte(0)}, []byte{byte(55), byte(255), byte(255), byte(1)}},
+		{[]byte{byte(55), byte(255), byte(255), byte(15)}, []byte{byte(55), byte(255), byte(255), byte(16)}},
+		{[]byte{byte(55), byte(200), byte(255)}, []byte{byte(55), byte(201)}},
+		{[]byte{byte(55), byte(255), byte(255)}, []byte{byte(56)}},
+		{[]byte{byte(255), byte(255), byte(255)}, nil},
+		{nil, nil},
+	}
+
+	for _, test := range testCases {
+		end := PrefixEndBytes(test.prefix)
+		assert.Equal(test.expected, end)
+	}
+}