diff --git a/internal/pkg/core/openolt_eventmgr_test.go b/internal/pkg/core/openolt_eventmgr_test.go
new file mode 100644
index 0000000..d5f1520
--- /dev/null
+++ b/internal/pkg/core/openolt_eventmgr_test.go
@@ -0,0 +1,149 @@
+/*
+ * 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 core provides APIs for the openOLT adapter
+package core
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/opencord/voltha-openolt-adapter/pkg/mocks"
+	oop "github.com/opencord/voltha-protos/v3/go/openolt"
+)
+
+func mockEventMgr() *OpenOltEventMgr {
+	ep := &mocks.MockEventProxy{}
+	dh := &DeviceHandler{}
+	dh.onus = sync.Map{}
+	dh.onus.Store(dh.formOnuKey(1, 1), &OnuDevice{deviceID: "TEST_ONU",
+		deviceType:   "ONU",
+		serialNumber: "TEST_ONU_123",
+		onuID:        1, intfID: 1})
+	return NewEventMgr(ep, dh)
+}
+func TestOpenOltEventMgr_ProcessEvents(t *testing.T) {
+	em := mockEventMgr()
+	type args struct {
+		alarmInd *oop.AlarmIndication
+		deviceID string
+		raisedTs int64
+	}
+	tests := []struct {
+		name string
+		args args
+	}{
+		// TODO: Add test cases.
+		// LosIndication alarms
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_LosInd{LosInd: &oop.LosIndication{IntfId: 1, Status: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_LosInd{LosInd: &oop.LosIndication{IntfId: 1}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_LosInd{LosInd: &oop.LosIndication{IntfId: 1, Status: "on"}}}}},
+
+		// OnuAlarmIndication alams
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LosStatus: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LosStatus: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LobStatus: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LobStatus: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LopcMissStatus: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LopcMissStatus: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LopcMicErrorStatus: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LopcMicErrorStatus: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LofiStatus: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LofiStatus: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LoamiStatus: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LoamiStatus: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuAlarmInd{OnuAlarmInd: &oop.OnuAlarmIndication{IntfId: 1, OnuId: 3, LosStatus: "on"}}}}},
+
+		// AlarmIndication_DyingGaspInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_DyingGaspInd{DyingGaspInd: &oop.DyingGaspIndication{IntfId: 1, OnuId: 1, Status: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_DyingGaspInd{DyingGaspInd: &oop.DyingGaspIndication{IntfId: 1, OnuId: 1, Status: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_DyingGaspInd{DyingGaspInd: &oop.DyingGaspIndication{IntfId: 1, OnuId: 1}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_DyingGaspInd{DyingGaspInd: &oop.DyingGaspIndication{IntfId: 1, OnuId: 1}}}}},
+
+		// AlarmIndication_OnuActivationFailInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuActivationFailInd{OnuActivationFailInd: &oop.OnuActivationFailureIndication{IntfId: 1, OnuId: 3}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuActivationFailInd{OnuActivationFailInd: &oop.OnuActivationFailureIndication{IntfId: 1, OnuId: 3}}}}},
+
+		// AlarmIndication_OnuLossOmciInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuLossOmciInd{OnuLossOmciInd: &oop.OnuLossOfOmciChannelIndication{IntfId: 1, OnuId: 3, Status: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuLossOmciInd{OnuLossOmciInd: &oop.OnuLossOfOmciChannelIndication{IntfId: 1, OnuId: 3, Status: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuLossOmciInd{OnuLossOmciInd: &oop.OnuLossOfOmciChannelIndication{IntfId: 1, OnuId: 3, Status: "on"}}}}},
+
+		// AlarmIndication_OnuDriftOfWindowInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuDriftOfWindowInd{OnuDriftOfWindowInd: &oop.OnuDriftOfWindowIndication{IntfId: 1, OnuId: 3, Status: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuDriftOfWindowInd{OnuDriftOfWindowInd: &oop.OnuDriftOfWindowIndication{IntfId: 1, OnuId: 3, Status: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuDriftOfWindowInd{OnuDriftOfWindowInd: &oop.OnuDriftOfWindowIndication{IntfId: 1, OnuId: 3, Drift: 10, NewEqd: 10}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuDriftOfWindowInd{OnuDriftOfWindowInd: &oop.OnuDriftOfWindowIndication{IntfId: 1, OnuId: 3, Status: "on"}}}}},
+
+		// AlarmIndication_OnuSignalDegradeInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalDegradeInd{OnuSignalDegradeInd: &oop.OnuSignalDegradeIndication{IntfId: 1, OnuId: 3, Status: "on", InverseBitErrorRate: 100}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalDegradeInd{OnuSignalDegradeInd: &oop.OnuSignalDegradeIndication{IntfId: 1, OnuId: 3, Status: "off", InverseBitErrorRate: 100}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalDegradeInd{OnuSignalDegradeInd: &oop.OnuSignalDegradeIndication{IntfId: 1, OnuId: 3, InverseBitErrorRate: 100}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalDegradeInd{OnuSignalDegradeInd: &oop.OnuSignalDegradeIndication{IntfId: 1, OnuId: 3, InverseBitErrorRate: 100}}}}},
+
+		// AlarmIndication_OnuSignalsFailInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalsFailInd{OnuSignalsFailInd: &oop.OnuSignalsFailureIndication{IntfId: 1, OnuId: 3, Status: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalsFailInd{OnuSignalsFailInd: &oop.OnuSignalsFailureIndication{IntfId: 1, OnuId: 3, Status: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalsFailInd{OnuSignalsFailInd: &oop.OnuSignalsFailureIndication{IntfId: 1, OnuId: 3, InverseBitErrorRate: 100}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuSignalsFailInd{OnuSignalsFailInd: &oop.OnuSignalsFailureIndication{IntfId: 1, OnuId: 3, InverseBitErrorRate: 100}}}}},
+
+		// AlarmIndication_OnuProcessingErrorInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuProcessingErrorInd{OnuProcessingErrorInd: &oop.OnuProcessingErrorIndication{IntfId: 1, OnuId: 3}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuProcessingErrorInd{OnuProcessingErrorInd: &oop.OnuProcessingErrorIndication{IntfId: 1, OnuId: 3}}}}},
+
+		// AlarmIndication_OnuTiwiInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuTiwiInd{OnuTiwiInd: &oop.OnuTransmissionInterferenceWarning{IntfId: 1, OnuId: 3, Status: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuTiwiInd{OnuTiwiInd: &oop.OnuTransmissionInterferenceWarning{IntfId: 1, OnuId: 3, Status: "on", Drift: 100}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuTiwiInd{OnuTiwiInd: &oop.OnuTransmissionInterferenceWarning{IntfId: 1, OnuId: 3}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuTiwiInd{OnuTiwiInd: &oop.OnuTransmissionInterferenceWarning{IntfId: 1, OnuId: 3}}}}},
+
+		// AlarmIndication_onuLossOfKeySyncInd
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuLossOfSyncFailInd{OnuLossOfSyncFailInd: &oop.OnuLossOfKeySyncFailureIndication{IntfId: 1, OnuId: 3, Status: "on"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+		{"ProcessEvents-", args{alarmInd: &oop.AlarmIndication{Data: &oop.AlarmIndication_OnuLossOfSyncFailInd{OnuLossOfSyncFailInd: &oop.OnuLossOfKeySyncFailureIndication{IntfId: 1, OnuId: 3, Status: "off"}}}, deviceID: "olt", raisedTs: time.Now().Unix()}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			em.ProcessEvents(tt.args.alarmInd, tt.args.deviceID, tt.args.raisedTs)
+		})
+	}
+}
+
+func TestOpenOltEventMgr_OnuDiscoveryIndication(t *testing.T) {
+	em := mockEventMgr()
+	type args struct {
+		onuDisc      *oop.OnuDiscIndication
+		deviceID     string
+		OnuID        uint32
+		serialNumber string
+		raisedTs     int64
+	}
+	tests := []struct {
+		name string
+		args args
+	}{
+		// TODO: Add test cases.
+		{"OnuDiscoveryIndication", args{onuDisc: &oop.OnuDiscIndication{IntfId: 1, SerialNumber: &oop.SerialNumber{VendorId: []byte("TWSH"), VendorSpecific: []byte("1234")}}, deviceID: "olt", OnuID: 3, serialNumber: "1234", raisedTs: time.Now().Unix()}},
+		{"OnuDiscoveryIndication", args{onuDisc: &oop.OnuDiscIndication{}, raisedTs: time.Now().Unix()}},
+		{"OnuDiscoveryIndication", args{onuDisc: &oop.OnuDiscIndication{}}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			em.OnuDiscoveryIndication(tt.args.onuDisc, tt.args.deviceID, tt.args.OnuID, tt.args.serialNumber, tt.args.raisedTs)
+		})
+	}
+}