Move remove() and removeAll() to tests

This is done to keep deadcode quiet.

cayley_test.go

@@ -19,6 +19,7 @@ import (
 	"compress/bzip2"
 	"compress/gzip"
 	"fmt"
+	"github.com/google/cayley/quad"
 	"io"
 	"reflect"
 	"sort"
@@ -411,6 +412,24 @@ func deletePrepare(t testing.TB) {
 	})
 }
 
+func removeAll(qw graph.QuadWriter, cfg *config.Config, path, typ string) error {
+	return decompressAndLoad(qw, cfg, path, typ, remove)
+}
+
+func remove(qw graph.QuadWriter, cfg *config.Config, dec quad.Unmarshaler) error {
+	for {
+		t, err := dec.Unmarshal()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+		qw.RemoveQuad(t)
+	}
+	return nil
+}
+
 func TestQueries(t *testing.T) {
 	prepare(t)
 	checkQueries(t)