diff --git a/serialize/base36/base36_test.go b/serialize/base36/base36_test.go
new file mode 100644
index 0000000..7e8aaf5
--- /dev/null
+++ b/serialize/base36/base36_test.go
@@ -0,0 +1,42 @@
+package base36
+
+import (
+	"fmt"
+	"testing"
+)
+
+func FuzzEncode(f *testing.F) {
+	testCases := []string{"a", "abc", "uuid"}
+	for _, tc := range testCases {
+		f.Add(tc)
+	}
+	f.Fuzz(func(t *testing.T, a string) {
+		encoded := Encode([]byte(a))
+		redecoded, err := Decode(encoded)
+		fmt.Printf("Origin: %s, Encoded: %s\n", a, encoded)
+		if err != nil {
+			t.Errorf("Decode(%q) failed: %v", encoded, err)
+		}
+		if string(redecoded) != a {
+			t.Errorf("Decode(%q) = %q, want %q", encoded, redecoded, a)
+		}
+	})
+}
+
+func FuzzEncodeInt64(f *testing.F) {
+	testCases := []int64{1, 6, 34598347534, 234532543, 2342546456, 34587639284756293}
+	for _, tc := range testCases {
+		f.Add(tc)
+	}
+	f.Fuzz(func(t *testing.T, a int64) {
+		encoded := EncodeInt64(a)
+		redecoded, err := DecodeToInt64(encoded)
+		fmt.Printf("Origin: %d, Encoded: %s\n", a, encoded)
+		if err != nil {
+			t.Errorf("Decode(%q) failed: %v", encoded, err)
+		}
+		if redecoded != a {
+			t.Errorf("Decode(%q) = %q, want %q", encoded, redecoded, a)
+		}
+	})
+}