Added test related to lang.

gql/parser_test.go

@@ -4476,6 +4476,19 @@ func TestInvalidValUsage(t *testing.T) {
 	require.Contains(t, err.Error(), "Query syntax invalid.")
 }
 
+func TestOrderWithMultipleLangFail(t *testing.T) {
+	query := `
+	{
+		me(func: uid(0x1), orderasc: name@en:fr, orderdesc: lastname@ci, orderasc: salary) {
+			name
+		}
+	}
+	`
+	_, err := Parse(Request{Str: query})
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "Sorting by an attribute: [name@en:fr] can only be done on one language")
+}
+
 func TestOrderWithLang(t *testing.T) {
 	query := `
 	{

types/sort_test.go

@@ -61,6 +61,25 @@ func TestSortStrings(t *testing.T) {
 		toString(t, list, StringID))
 }
 
+func TestSortLanguage(t *testing.T) {
+	// Sorting strings of german language.
+	list := getInput(t, StringID, []string{"öffnen", "zumachen"})
+	ul := getUIDList(2)
+
+	require.NoError(t, Sort(list, ul, []bool{false}, "de"))
+	require.EqualValues(t, []uint64{100, 200}, ul.Uids)
+	require.EqualValues(t, []string{"öffnen", "zumachen"},
+		toString(t, list, StringID))
+
+	// Sorting strings of swedish language.
+	list = getInput(t, StringID, []string{"öppna", "zon"})
+
+	require.NoError(t, Sort(list, ul, []bool{false}, "sv"))
+	require.EqualValues(t, []uint64{200, 100}, ul.Uids)
+	require.EqualValues(t, []string{"zon", "öppna"},
+		toString(t, list, StringID))
+}
+
 func TestSortInts(t *testing.T) {
 	list := getInput(t, IntID, []string{"22", "111", "11", "212"})
 	ul := getUIDList(4)