testL add TestParsingError

Author: hacdias

cid_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	crand "crypto/rand"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"math/rand"
@@ -763,3 +764,15 @@ func TestLoggable(t *testing.T) {
 		t.Fatalf("did not get expected loggable form (got %v)", actual)
 	}
 }
+
+func TestParsingError(t *testing.T) {
+	_, err := Decode("not-a-cid")
+	if err == nil {
+		t.Fatal("expected error")
+	}
+
+	is := errors.Is(err, &ErrInvalidCid{})
+	if !is {
+		t.Fatal("expected error to be ErrInvalidCid")
+	}
+}