implement fmt.Stringer interface on Tuple

bindings/go/src/fdb/tuple/tuple.go

@@ -66,6 +66,12 @@ type TupleElement interface{}
 // packing T (modulo type normalization to []byte, uint64, and int64).
 type Tuple []TupleElement
 
+// String implements the fmt.Stringer interface and return the tuple
+// as a human readable byte string provided by fdb.Printable.
+func (t Tuple) String() string {
+	return fdb.Printable(t.Pack())
+}
+
 // UUID wraps a basic byte array as a UUID. We do not provide any special
 // methods for accessing or generating the UUID, but as Go does not provide
 // a built-in UUID type, this simple wrapper allows for other libraries

bindings/go/src/fdb/tuple/tuple_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/gob"
 	"flag"
+	"fmt"
 	"math/rand"
 	"os"
 	"testing"
@@ -118,3 +119,12 @@ func BenchmarkTuplePacking(b *testing.B) {
 		})
 	}
 }
+
+func TestTupleString(t *testing.T) {
+	printed := fmt.Sprint(Tuple{[]byte("hello"), "world", 42, 0x99})
+	expected := "\\x01hello\\x00\\x02world\\x00\\x15*\\x15\\x99"
+
+	if printed != expected {
+		t.Fatalf("printed tuple result differs, expected %v, got %v", expected, printed)
+	}
+}