Add logging feature for debug

This diff adds logging feature for debug.

logging/logging_test.go

@@ -0,0 +1,68 @@
+// Copyright (c) 2018 Intel Corporation
+//
+// 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.
+
+package logging
+
+import (
+	"testing"
+
+        . "github.com/onsi/ginkgo"
+        . "github.com/onsi/gomega"
+)
+
+func TestLogging(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Logging")
+}
+
+var _ = Describe("logging operations", func() {
+
+	BeforeEach(func() {
+		loggingStderr = false
+		loggingFp = nil
+		loggingLevel = PanicLevel
+	})
+
+	It("Check file setter with empty", func() {
+		SetLogFile("")
+		Expect(loggingFp).To(BeNil())
+	})
+
+	It("Check file setter with empty", func() {
+		SetLogFile("/tmp/foobar.logging")
+		Expect(loggingFp).NotTo(Equal(nil))
+		// check file existance
+	})
+
+	It("Check loglevel setter", func() {
+		SetLogLevel("debug")
+		Expect(loggingLevel).To(Equal(DebugLevel))
+		SetLogLevel("Error")
+		Expect(loggingLevel).To(Equal(ErrorLevel))
+		SetLogLevel("PANIC")
+		Expect(loggingLevel).To(Equal(PanicLevel))
+	})
+
+	It("Check loglevel setter with invalid level", func() {
+		currentLevel := loggingLevel
+		SetLogLevel("XXXX")
+		Expect(loggingLevel).To(Equal(currentLevel))
+	})
+
+	It("Check log to stderr setter with invalid level", func() {
+		currentVal := loggingStderr
+		SetLogStderr(!currentVal)
+		Expect(loggingStderr).NotTo(Equal(currentVal))
+	})
+})