NSubstitute - Check arguments passed to method

Question

We are currently in the process of moving from RhinoMocks to NSubstitute.

I have a method that takes an object of type DatabaseParams. This class has the following structure (simplified):

public class DatabaseParams
{
    public string StoredProcName { get; private set; }
    public SqlParameter[] Parameters { get; private set; }

    public DatabaseParams(string storedProcName, SqlParameter[] spParams)
    {
         StoredProcName = storedProcName;
         Parameters = spParams;
    }
}

I have the following method I want to check the arguments being passed to it are correct:

public interface IHelper
{
    Task<object> ExecuteScalarProcedureAsync(DatabaseParams data);
}

How do I test that an instance of DatabaseParams was passed into that method with the correct values?

I could do this in RhinoMocks with something like this:

helperMock.Expect(m => m.ExecuteScalarProcedureAsync(Arg<DatabaseHelperParameters>.Matches(
        p =>   p.StoredProcName == "up_Do_Something"
            && p.Parameters[0].ParameterName == "Param1"
            && p.Parameters[0].Value.ToString() == "Param1Value"
            && p.Parameters[1].ParameterName == "Param2"
            && p.Parameters[1].Value.ToString() == "Param2Value"
        ))).Return(Task.FromResult<DataSet>(null));

The helperMock is mocking the interface IHelper that contains the ExecuteScalarProcedureAsync method.

Answer 1

I've figured out the answer myself.

NSubstitute just needs to use the .Received() call and then when you specify your argument to the method. You can specify the argument matching as a predicate.

For example:

  helperMock.Received().ExecuteScalarProcedureAsync(Arg.Is<DatabaseParams>(
   p =>   p.StoredProcName == "up_Do_Something"
        && p.Parameters[0].ParameterName == "Param1"
        && p.Parameters[0].Value.ToString() == "Param1Value"
        && p.Parameters[1].ParameterName == "Param2"
        && p.Parameters[1].Value.ToString() == "Param2Value"));