VOL-1940 - Unit test cases for signals.go

Change-Id: I576fcfba0f117d91994bc691d702877ca14da66f
diff --git a/internal/pkg/afrouter/signals_test.go b/internal/pkg/afrouter/signals_test.go
new file mode 100644
index 0000000..3d72ac4
--- /dev/null
+++ b/internal/pkg/afrouter/signals_test.go
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// This file implements an exit handler that tries to shut down all the
+// running servers before finally exiting. There are 2 triggers to this
+// clean exit thread: signals and an exit channel.
+
+package afrouter
+
+import (
+	"github.com/opencord/voltha-go/common/log"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func init() {
+	log.SetDefaultLogger(log.JSON, log.DebugLevel, nil)
+	log.AddPackage(log.JSON, log.WarnLevel, nil)
+}
+
+// Test for function signalHandler and cleanExit
+func TestSignalsInitExitHandler(t *testing.T) {
+
+	assert.Nil(t, InitExitHandler())
+
+}