我将如何使用 moq 来测试 MongoDB 服务层? [英] How would I use moq to test a MongoDB service layer?

问题描述

我的应用程序和 mongo 数据库之间有一个服务层.

I have a service layer between my app and the mongo database.

我正在尝试使用 moq 构建单元测试我对起订量很陌生，所以我从我认为是微不足道的测试开始.

I'm trying to build a unit test using moq I'm quite new to moq so I started with what I thought would be a trivial test.

要测试的代码:

    public List<BsonDocument> GetAllSettings()
    {
        var collection = MongoDatabase.GetCollection<BsonDocument>("Settings");
        var query = from e in collection.AsQueryable()
                    select e;

        var settings = query.ToList();
        return settings;
    }

哪里:设置是一个集合MongoDatabase 是一个 MongoDBDriver.MongoDatabase

Where: Settings is a Collection MongoDatabase is a MongoDBDriver.MongoDatabase

我试过这个作为我的测试:

I've tried this as my test:

    [Test()]
    public void GetAllSettingsTest()
    {
        //Arrange
        BsonDocument doc01 = new BsonDocument();
        BsonDocument doc02 = new BsonDocument();

        var mongoDatabase = new Mock<MongoDatabase>();
        var collection = new Mock<MongoCollection<BsonDocument>>();
        mongoDatabase.Setup(f => f.GetCollection(MongoCollection.Settings)).Returns(collection.Object);
        collection.Object.Insert(doc01);
        collection.Object.Insert(doc02);

        ILogger logger = new Logger();
        DatabaseClient.DatabaseClient target = new DatabaseClient.DatabaseClient(logger);
        target.MongoDatabase = mongoDatabase.Object;

        MongoCursor<BsonDocument> cursor = collection.Object.FindAllAs<BsonDocument>();

        List<BsonDocument> expected = cursor.ToList();
        List<BsonDocument> actual;

        //Act
        actual = target.GetAllSettings();

        //Assert
        Assert.AreEqual(expected, actual);
    }

我在以下位置收到找不到无参数构造函数"的错误:

I'm getting an error of "Could not find a parameterless constructor" at:

mongoDatabase.Setup(f => f.GetCollection(MongoCollections.Settings)).Returns(collection.Object);

mongoDatabase.Setup(f => f.GetCollection(MongoCollections.Settings)).Returns(collection.Object);

错误是指 MongoCollection 对象.我不认为它有构造函数.

The error refers to the MongoCollection object. I didn't think it had a constructor.

我该怎么做才能运行我的测试?

What can I do to get my test to run?

推荐答案

这个问题很可能与:如何模拟 MongoDB 对象来测试我的数据模型?

无论如何，这是模拟所需的最小起订量配置

Anyway, here is minimal Moq configuration required to mock

        var message = string.Empty;

        var serverSettings = new MongoServerSettings()
        {
            GuidRepresentation = MongoDB.Bson.GuidRepresentation.Standard,
            ReadEncoding = new UTF8Encoding(),
            ReadPreference = new ReadPreference(),
            WriteConcern = new WriteConcern(),
            WriteEncoding = new UTF8Encoding()
        };

        var server = new Mock<MongoServer>(serverSettings);
        server.Setup(s => s.Settings).Returns(serverSettings);
        server.Setup(s => s.IsDatabaseNameValid(It.IsAny<string>(), out message)).Returns(true);

        var databaseSettings = new MongoDatabaseSettings()
        {
            GuidRepresentation = MongoDB.Bson.GuidRepresentation.Standard,
            ReadEncoding = new UTF8Encoding(),
            ReadPreference = new ReadPreference(),
            WriteConcern = new WriteConcern(),
            WriteEncoding = new UTF8Encoding()
        };

        var database = new Mock<MongoDatabase>(server.Object, "test", databaseSettings);
        database.Setup(db => db.Settings).Returns(databaseSettings);
        database.Setup(db => db.IsCollectionNameValid(It.IsAny<string>(), out message)).Returns(true);

        var mockedCollection = collection.Object;

无论如何，正如我在链接问题中提到的，当 MongoDriver 的任何内部工作发生变化时，这可能没有用.

Anyway, as I mentioned in linked question, this might not be useful when any of inner-workings of MongoDriver change.

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