fixed mock deadlock + cover Close in tests

heartbeat/monitor/monitor_test.go

@@ -206,6 +206,8 @@ func TestNewHeartbeatV2Monitor(t *testing.T) {
 		message2 := createHeartbeatMessage(true)
 		args.Cache.Put(pid2, message2, message2.Size())
 		time.Sleep(time.Second) // allow goroutines to execute
+
+		assert.Nil(t, monitor.Close())
 	})
 }
 

testscommon/cacherMock.go

@@ -102,6 +102,9 @@ func (cacher *CacherMock) Remove(key []byte) {
 
 // Keys -
 func (cacher *CacherMock) Keys() [][]byte {
+	cacher.mut.RLock()
+	defer cacher.mut.RUnlock()
+
 	keys := make([][]byte, len(cacher.dataMap))
 	idx := 0
 	for k := range cacher.dataMap {