Add additional functions to the Logger interface to allow usage as a
grpc loggerv2 interface.

Change-Id: I558e0d27a5019993798683d5cb4f953b7064c07a
diff --git a/common/log/log_test.go b/common/log/log_test.go
new file mode 100644
index 0000000..dbd9ffe
--- /dev/null
+++ b/common/log/log_test.go
@@ -0,0 +1,79 @@
+/*
+ * 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.
+ */
+package log
+
+import (
+	"github.com/opencord/voltha-go/common/log"
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc/grpclog"
+	"testing"
+)
+
+/*
+Prerequite:  Start the kafka/zookeeper containers.
+*/
+
+var testLogger log.Logger
+
+
+func TestInit (t *testing.T) {
+	var err error
+	testLogger, err = log.AddPackage(log.JSON, log.ErrorLevel, nil)
+	assert.NotNil(t, testLogger)
+	assert.Nil(t, err)
+}
+
+func verifyLogLevel(t *testing.T, minimumLevel int) {
+	log.SetAllLogLevel(minimumLevel)
+	var success bool
+	for i := 0; i < 6; i++ {
+		success = testLogger.V(i)
+		if i == 1 && minimumLevel == 2{
+			// TODO: Update the test when a new version of Zap logger is available.  It has a bug with that
+			// specific combination
+			continue
+		}
+		if i < minimumLevel {
+			assert.False(t, success)
+		} else {
+			assert.True(t, success)
+		}
+	}
+}
+
+func TestLogLevelDebug (t *testing.T) {
+	for i := 0; i < 6; i++ {
+		verifyLogLevel(t, i)
+	}
+}
+
+func TestUpdateAllLoggers (t *testing.T) {
+	err := log.UpdateAllLoggers(log.Fields{"update": "update"})
+	assert.Nil(t, err)
+}
+
+func TestUpdateLoggers (t *testing.T) {
+	testLogger, err := log.UpdateLogger(log.Fields{"update": "update"})
+	assert.Nil(t, err)
+	assert.NotNil(t, testLogger)
+}
+
+func TestUseAsGrpcLoggerV2(t *testing.T) {
+	var grpcLogger grpclog.LoggerV2
+	thisLogger, _ := log.AddPackage(log.JSON, log.ErrorLevel, nil)
+	grpcLogger = thisLogger
+	assert.NotNil(t, grpcLogger)
+}
\ No newline at end of file