test: ensure fixtures are processed in order

fixtures_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"testing"
 )
@@ -21,6 +22,8 @@ func TestConvertFixtures(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	sort.Strings(fixtures)
+
 	for _, fixture := range fixtures {
 		if !strings.HasSuffix(fixture, `.php`) {
 			continue