diff --git a/cid_test.go b/cid_test.go
index df40f8d..fe2e768 100644
--- a/cid_test.go
+++ b/cid_test.go
@@ -190,6 +190,22 @@ func TestV0Handling(t *testing.T) {
 	if cid.String() != old {
 		t.Fatal("marshaling roundtrip failed")
 	}
+
+	new, err := cid.StringOfBase(mbase.Base58BTC)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if new != old {
+		t.Fatal("StringOfBase roundtrip failed")
+	}
+
+	encoder, err := mbase.NewEncoder(mbase.Base58BTC)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cid.Encode(encoder) != old {
+		t.Fatal("Encode roundtrip failed")
+	}
 }
 
 func TestV0ErrorCases(t *testing.T) {