diff --git a/app_test.go b/app_test.go
index da638b8e2f..1a6d360048 100644
--- a/app_test.go
+++ b/app_test.go
@@ -967,6 +967,35 @@ func Test_App_Listen_Prefork(t *testing.T) {
 	utils.AssertEqual(t, nil, app.Listen(":99999"))
 }
 
+// go test -run Test_App_ListenTLS
+func Test_App_ListenTLS(t *testing.T) {
+	app := New()
+
+	// invalid port
+	utils.AssertEqual(t, false, app.ListenTLS(":99999", "./.github/testdata/ssl.pem", "./.github/testdata/ssl.key") == nil)
+	// missing perm/cert file
+	utils.AssertEqual(t, false, app.ListenTLS(":0", "", "./.github/testdata/ssl.key") == nil)
+
+	go func() {
+		time.Sleep(1000 * time.Millisecond)
+		utils.AssertEqual(t, nil, app.Shutdown())
+	}()
+
+	utils.AssertEqual(t, nil, app.ListenTLS(":0", "./.github/testdata/ssl.pem", "./.github/testdata/ssl.key"))
+}
+
+// go test -run Test_App_ListenTLS_Prefork
+func Test_App_ListenTLS_Prefork(t *testing.T) {
+	testPreforkMaster = true
+
+	app := New(Config{DisableStartupMessage: true, Prefork: true})
+
+	// invalid key file content
+	utils.AssertEqual(t, false, app.ListenTLS(":0", "./.github/testdata/ssl.pem", "./.github/testdata/template.html") == nil)
+
+	utils.AssertEqual(t, nil, app.ListenTLS(":99999", "./.github/testdata/ssl.pem", "./.github/testdata/ssl.key"))
+}
+
 // go test -run Test_App_Listener
 func Test_App_Listener(t *testing.T) {
 	app := New()
@@ -990,7 +1019,7 @@ func Test_App_Listener_Prefork(t *testing.T) {
 	utils.AssertEqual(t, nil, app.Listener(ln))
 }
 
-func Test_App_Listener_TLS(t *testing.T) {
+func Test_App_Listener_TLS_Listener(t *testing.T) {
 	// Create tls certificate
 	cer, err := tls.LoadX509KeyPair("./.github/testdata/ssl.pem", "./.github/testdata/ssl.key")
 	if err != nil {