Unit test, Rhino, The art of unit testing - unit-testing

Question

I've started to read "The art of unit testing" and I'm trying to implement this piece of code:
[Test]
public void ReturnResultsFromMock()
{
MockRepository mocks = new MockRepository();
IGetResults resultGetter = mocks.DynamicMock<IGetResults>();
using(mocks.Record())
{
resultGetter.GetSomeNumber("a");//#1
LastCall.Return(1);
resultGetter.GetSomeNumber("a");//#2 how it should work?
LastCall.Return(2);
resultGetter.GetSomeNumber("b");
LastCall.Return(3);
}
int result = resultGetter.GetSomeNumber("b");
Assert.AreEqual(3, result);
int result2 = resultGetter.GetSomeNumber("a");
Assert.AreEqual(1, result2);
int result3 = resultGetter.GetSomeNumber("a");
Assert.AreEqual(2, result3);
}
I get this error message after running my test
AOUT.Loga.Tests.LogAnalyzerTest.ReturnResultsFromMock:
Expected: 2
But was: 1

Answer 1

Looks like you try to implement ordered sequence of calls (see details here):
First you call GetSomeNumber("a") should returns 1
Then call GetSomeNumber("a") again, result will be 2
And only then GetSomeNumber("b"), result will be 3
Is so, try to replace using(mocks.Record()) with using(mocks.Ordered()). But, this will work only in this sequence of calls
At your example, you are using using(mocks.Record()), so every call to GetSomeNumber("a") will return 2 acording to your configuration. You're override first GetSomeNumber("a") by second one. Here are correct assumptions:
int result = resultGetter.GetSomeNumber("b");
Assert.AreEqual(3, result);
int result2 = resultGetter.GetSomeNumber("a");
Assert.AreEqual(2, result2); // every call to GetSomeNumber("a") will returns 2
int result3 = resultGetter.GetSomeNumber("a");
Assert.AreEqual(2, result3);

Answer 2

You may try using the simpler Rhino Mocks AAA syntax, your code will look something like this (take a look also at this question):
// Arrange
var resultGetter = MockRepository.GenerateMock<IGetResults>;
resultGetter.Expect(x => x.GetSomeNumber("b")).Return(3);
resultGetter.Expect(x => x.GetSomeNumber("a")).Return(1).Repeat.Once();
resultGetter.Expect(x => x.GetSomeNumber("b")).Return(2).Repeat.Once();
// Act
int result = resultGetter.GetSomeNumber("b");
// Assert
Assert.AreEqual(3, result);
// Act
int result2 = resultGetter.GetSomeNumber("a");
// Assert
Assert.AreEqual(1, result2);
// Act
int result3 = resultGetter.GetSomeNumber("a");
// Assert
Assert.AreEqual(2, result3);