Skip a test on Go 1.13 where gofmt disagrees about formatting

generate/generate_test.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -62,6 +63,13 @@ func TestGenerate(t *testing.T) {
 				t.Fatal(err)
 			}
 
+			if strings.HasPrefix(runtime.Version(), "go1.13") &&
+				sourceFilename == "InterfaceNesting.graphql" {
+				// gofmt on 1.13 formats this slightly differently.
+				// TODO(benkraft): Vendor in a specific version of gofmt,
+				// to use for all Go versions.  (Maybe only for tests.)
+			}
+
 			for filename, content := range generated {
 				t.Run(filename, func(t *testing.T) {
 					testutil.Cupaloy.SnapshotT(t, string(content))