Fixed FolderObjectStorage remaining the last content when the saved content is reduced (#247)

Author: d18zj

src/Exceptionless/Storage/FolderObjectStorage.cs

@@ -68,7 +68,7 @@ public bool SaveObject<T>(string path, T value) where T : class {
                 if (!Directory.Exists(directory))
                     Directory.CreateDirectory(directory);
 
-                using (var writer = File.OpenWrite(Path.Combine(Folder, path))) {
+                using (var writer = File.Open(Path.Combine(Folder, path), FileMode.Create)) {
                     _resolver.GetStorageSerializer().Serialize(value, writer);
                 }
             } catch (Exception ex) {

test/Exceptionless.Tests/Storage/FolderFileStorageTests.cs

@@ -1,7 +1,9 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using Xunit;
 using Exceptionless.Dependency;
+using Exceptionless.Logging;
 using Exceptionless.Serializer;
 using Exceptionless.Storage;
 using Xunit.Abstractions;
@@ -16,18 +18,49 @@ protected override IObjectStorage GetStorage() {
             var resolver = new DefaultDependencyResolver();
             resolver.Register<IJsonSerializer, DefaultJsonSerializer>();
             resolver.Register<IStorageSerializer, DefaultJsonSerializer>();
+            resolver.Register<IExceptionlessLog, NullExceptionlessLog>();
+
             return new FolderObjectStorage(resolver, "temp");
         }
 
         [Fact]
         public void CanUseDataDirectory() {
             var resolver = new DefaultDependencyResolver();
             resolver.Register<IJsonSerializer, DefaultJsonSerializer>();
-
+           
             var storage = new FolderObjectStorage(resolver, DATA_DIRECTORY_QUEUE_FOLDER);
             Assert.NotNull(storage.Folder);
             Assert.NotEqual(DATA_DIRECTORY_QUEUE_FOLDER, storage.Folder);
             Assert.True(storage.Folder.EndsWith("Queue" + Path.DirectorySeparatorChar) || storage.Folder.EndsWith("Queue" + Path.AltDirectorySeparatorChar), storage.Folder);
         }
+
+
+        [Fact]
+        public void Get_Save_Object_Multiple_Test() {
+
+            var storage = GetStorage();
+            var list = new List<int>() { 1, 2, 3 };
+            var path = "test.json";
+
+            //
+            storage.SaveObject(path, list);
+            var list2 = storage.GetObject<List<int>>(path);
+            Assert.Equal(list,list2);
+
+
+            //Save after adding items to the list 
+            list.Add(4);
+            storage.SaveObject(path, list);
+            list2 = storage.GetObject<List<int>>(path);
+            Assert.Equal(list, list2);
+
+            //Save the list after remove items 
+            list.Remove(4);
+            storage.SaveObject(path, list);
+            list2 = storage.GetObject<List<int>>(path);
+            Assert.Equal(list, list2);
+
+
+        }
     }
 }