NSubstitute - Check arguments passed to method

c#, mocking, nsubstitute

Solution

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"));

Problem

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 storeProcName, SqlParameter[] spParams) { StoredProcName = storeProcName; 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.

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