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をMoockを使って嘲笑するときに、SaveChanges()が0以外の値を返す方法を知っている人がいるのでしょうか。私は頻繁にSaveChanges()を使用してアイテムの数がSavedまたはUnSavedの数が予想される変更の数よりも少ないか多い場合にエラーをスローします。モックDbContext SaveChanges（）メソッドは値を返しません
私の経験では、データベースへの呼び出しを行わない場合、DbContext.SaveChanges()は何もしません。イェルーンHeierとNkosiから
アップデート2016年9月8日
提案がソリューションを提供し支援してきました。私はモックに深く掘り下げて、SaveChanges()が仮想だったことに気づいたはずです。参考までに、私がやっていることをデモするために、以下のコードを追加します。ビジネスロジックがデータベースに保存されるアイテムの数に依存する場合、変更を保存するためにコールバックを定義する必要があることに注意してください。DbContext.Setup().Callback(() => { /* do something */})コールバックを使用すると、変更の保存が予想される回数を追跡し、テストでアサートすることができます。
PostServiceクラス
public PostViewModel SavePost(PostViewModel currentPost, bool publishPost)
{
//_context.Configuration.ProxyCreationEnabled = false;
JustBlogContext currentContext = (JustBlogContext)_Context;
Post newPost = new Post();
List<Tag> postTags = new List<Tag>();
DateTime currentDateTime = DateTime.UtcNow;
bool saveSuccess = false;
if (currentPost != null)
{
//Post
newPost = new Post()
{
Category = currentPost.Category.Id.Value,
Description = currentPost.Description,
ShortDescription = currentPost.ShortDescription,
Title = currentPost.Title,
UrlSlug = currentPost.UrlSlug,
Published = currentPost.Published == true || publishPost == true ? true : false,
Meta = currentPost.Meta == "" || currentPost.Meta == null ? "No meta data" : currentPost.Meta,
PostedOn = currentPost.PostedOn,
Modified = currentDateTime
};
//Tags
foreach (Tag currentTag in currentPost?.Tags)
{
postTags.Add(new Tag()
{
Description = currentTag.Description,
Id = currentTag.Id,
Name = currentTag.Name,
UrlSlug = currentTag.UrlSlug
});
}
if (currentPost.PostedOn == null && publishPost)
{
newPost.PostedOn = currentDateTime;
}
/**
* Note that you must track all entities
* from the Post side of the Post - PostTagMap - Tag database schema.
* If you incorrectly track entites you will add new tags as opposed to
* maintaining the many-to-many relationship.
**/
if (currentPost?.Id == null)
{
//Add a new post
//Attach tags from the database to post
foreach (Tag clientTag in postTags)
{
if (currentContext.Entry(clientTag).State == EntityState.Detached)
{
currentContext.Tags.Attach(clientTag);
}
}
newPost.Tags = postTags;
currentContext.Posts.Add(newPost);
saveSuccess = currentContext.SaveChanges() > 0 ? true : false;
}
else
{
//Modify and existing post.
bool tagsModified = false;
newPost.Id = currentPost.Id.Value;
currentContext.Posts.Attach(newPost);
currentContext.Entry(newPost).State = EntityState.Modified;
saveSuccess = currentContext.SaveChanges() > 0 ? true : false;
List<Tag> dataTags = currentContext.Posts.Include(post => post.Tags).FirstOrDefault(p => p.Id == newPost.Id).Tags.ToList();
//Remove old tags
foreach (Tag tag in dataTags)
{
if (!postTags.Select(p => p.Id).ToList().Contains(tag.Id))
{
tagsModified = true;
newPost.Tags.Remove(tag);
}
}
if (postTags.Count() > 0)
{
//Add new tags
foreach (Tag clientTag in postTags)
{
//Attach each tag because it comes from the client, not the database
if (!dataTags.Select(p => p.Id).ToList().Contains(clientTag.Id))
{
currentContext.Tags.Attach(clientTag);
}
if (!dataTags.Select(p => p.Id).ToList().Contains(clientTag.Id))
{
tagsModified = true;
newPost.Tags.Add(currentContext.Tags.Find(clientTag.Id));
}
}
//Only save changes if we modified the tags
if (tagsModified)
{
saveSuccess = currentContext.SaveChanges() > 0 ? true : false;
}
}
}
}
if (saveSuccess != false)
{
return loadEditedPost(currentContext, newPost);
}
else
{
throw new JustBlogException($"Error saving changes to {newPost.Title}");
}
}
で"SavePost" 方法 "SavePost_New_Post_Test" 試験方法PostService_Test.cs
/// <summary>
/// Test saving a new post
/// </summary>
[TestMethod]
public void SavePost_New_Post_Test()
{
//Arrange
var postSet_Mock = new Mock<DbSet<Post>>();
var justBlogContext_Mock = new Mock<JustBlogContext>();
justBlogContext_Mock.Setup(m => m.Posts).Returns(postSet_Mock.Object);
IPostService postService = new PostService(justBlogContext_Mock.Object);
// setup Test
CategoryViewModel newCategory = new CategoryViewModel()
{
Description = "Category Description",
Id = 0,
Modified = new DateTime(),
Name = "Name",
PostCount = 0,
Posts = new List<Post>(),
UrlSlug = "Category Url Slug"
};
Tag newTag = new Tag()
{
Description = "Tag Description",
Id = 1,
Modified = new DateTime(),
Name = "Tag Name",
Posts = new List<Post>(),
UrlSlug = "Url Slug"
};
Tag newTag2 = new Tag()
{
Description = "Tag Description 2",
Id = 2,
Modified = new DateTime(),
Name = "Tag Name 2",
Posts = new List<Post>(),
UrlSlug = "UrlSlug2"
};
List<Tag> tags = new List<Tag>();
tags.Add(newTag);
tags.Add(newTag2);
// setup new post
PostViewModel newPost = new PostViewModel()
{
Category = newCategory,
Description = "Test Descritpion",
Meta = "Meta text",
Modified = new DateTime(),
Published = false,
PostedOn = null,
ShortDescription = "Short Description",
Title = "TestTitle",
UrlSlug = "TestUrlSlug",
Tags = tags,
Id = null
};
// counters to verify call order
int addPostCount = 0;
int addTagAttachCount = 0;
int saveChangesCount = 0;
int totalActionCount = 0;
// Register callbacks to keep track of actions that have occured
justBlogContext_Mock.Setup(x => x.Posts.Add(It.IsAny<Post>())).Callback(() =>
{
addPostCount++;
totalActionCount++;
});
justBlogContext_Mock.Setup(x => x.SaveChanges()).Callback(() =>
{
saveChangesCount++;
totalActionCount++;
});
justBlogContext_Mock.Setup(x => x.SaveChanges()).Returns(1);
justBlogContext_Mock.Setup(x => x.Tags.Attach(It.IsAny<Tag>())).Callback(() =>
{
addTagAttachCount++;
totalActionCount++;
});
// Act
postService.SavePost(newPost, false);
// Assert
justBlogContext_Mock.Verify(m => m.SaveChanges(), Times.AtLeastOnce());
Assert.IsTrue(addPostCount == 1);
Assert.IsTrue(addTagAttachCount == 2);
Assert.IsTrue(totalActionCount == 4);
}
SaveChangesは仮想メソッドです。 context.Setup（x => x.SaveChanges（））を使用できます。 –