Unit Test mongoDb with .net core-CodePudding

The

CodePudding user response：

To use your ApplicationSettings as mocked ApplicationSettings, you must use an expression in the setup method.

Instead of:

IApplicationSettings applicationSettings = new ApplicationSettings() { UserCollectionName = "users" }; _mockApplicationSettings.Setup(app => applicationSettings).Returns(applicationSettings);

Use e.g. this:

IApplicationSettings applicationSettings = new ApplicationSettings() { UserCollectionName= "users" }; _mockApplicationSettings.Setup(app => app.UserCollectionName).Returns(applicationSettings.UserCollectionName);

CodePudding user response：

You are trying to use ApplicationSettings as an expression. The setup method expects you to provide an expression for when to activate the mocked override.

In your case just get rid of the Mock<IApplicationSettings> altogether and mock all the objects you need to call any methods on:

[Fact] public async Task GetUserWithId_Test() { // Arrange var userModel = new UserModel() { Id = "123" }; var mockCursor = new Mock<IAsyncCursor<UserModel>>(); mockCursor .Setup(c => c.FirstOrDefault()) .Returns(userModel); var mockCollection = new Mock<IMongoCollection<UserModel>>(); Predicate<UserModel> filter = u => u.Id == userModel.Id; mockCollection .Setup(c => c.FindAsync(filter)) .ReturnsAsync(mockCursor.Object); var mockDb = new Mock<IMongoDatabase>(); mockDb .Setup(db => db.GetCollection<UserModel>(It.IsAny<string>())) .Returns(mockCollection.Object); _mockClient .Setup(c => c.GetDatabase(It.IsAny<string>())) .Returns(mockDb.Object) var ctr = new UserManagementRepository(new(), new(), _mockClient.Object); // Act var result = ctr.Get("132"); // Assert result.StatusCode.Should().Be(ResponseCode.Success); result.Message.Should().Be("User exists!"); result.Data.Should().Be(userModel); }

Hope this helps a little