Remove monitor server and instead use callback

monitor/item_test.go

@@ -1,6 +1,7 @@
 package monitor
 
 import (
+	"encoding/json"
 	"testing"
 	"time"
 )
@@ -59,3 +60,15 @@ func Test_ItemCompare(t *testing.T) {
 		}
 	}
 }
+
+func Test_ItemJSON(t *testing.T) {
+	item := NewItem("any", time.Minute)
+	var itemB Item
+	if b, err := json.Marshal(item); err != nil {
+		t.Fatalf("cannot marshal item: %v", err)
+	} else if err := json.Unmarshal(b, &itemB); err != nil {
+		t.Fatalf("cannot unmarshal item: %v", err)
+	} else if item.next = itemB.next; itemB != *item {
+		t.Fatalf("unmarshaled item does not match original: %v, expected %v", itemB, *item)
+	}
+}