Remove temporal configuration file after a while

internal/ingress/controller/nginx_test.go

@@ -22,6 +22,8 @@ import (
 	"net"
 	"net/http"
 	"net/http/httptest"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 	"time"
@@ -404,3 +406,58 @@ func TestNextPowerOf2(t *testing.T) {
 		t.Errorf("TestNextPowerOf2: expected %d but returned %d.", 0, actual)
 	}
 }
+
+func TestCleanTempNginxCfg(t *testing.T) {
+	err := cleanTempNginxCfg()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tmpfile, err := ioutil.TempFile("", tempNginxPattern)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tmpfile.Close()
+
+	dur, err := time.ParseDuration("-10m")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	oldTime := time.Now().Add(dur)
+	err = os.Chtimes(tmpfile.Name(), oldTime, oldTime)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tmpfile, err = ioutil.TempFile("", tempNginxPattern)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tmpfile.Close()
+
+	err = cleanTempNginxCfg()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var files []string
+
+	err = filepath.Walk(os.TempDir(), func(path string, info os.FileInfo, err error) error {
+		if info.IsDir() && os.TempDir() != path {
+			return filepath.SkipDir
+		}
+
+		if strings.HasPrefix(info.Name(), tempNginxPattern) {
+			files = append(files, path)
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(files) != 1 {
+		t.Errorf("expected one file but %d were found", len(files))
+	}
+}