using Calculator.Domain;
using Calculator.Presentation.Commands;
using MbUnit.Framework;
using Rhino.Mocks;

namespace Calculator.Test.presentation.commands {
	[TestFixture]
	public class AdditionOperationCommandTest {
		[SetUp]
		public void SetUp() {
			mockery = new MockRepository( );
			builder = mockery.DynamicMock< INumberBuilder >( );
			calculation = mockery.DynamicMock< ICurrentCalculation >( );
		}

		private IAdditionOperationCommand CreateSUT() {
			return new AdditionOperationCommand( builder, calculation );
		}

		[Test]
		public void should_leverage_builder_to_retrieve_the_current_number() {
			using ( mockery.Record( ) ) {
				Expect.Call( builder.Build( ) ).Return( null ).Repeat.AtLeastOnce( );
			}

			using ( mockery.Playback( ) ) {
				CreateSUT( ).Execute( );
			}
		}

		[Test]
		public void Should_start_new_expression_using_the_number_retrieved_from_the_builder() {
			var number = mockery.DynamicMock< INumber >( );

			using ( mockery.Record( ) ) {
				SetupResult.For( builder.Build( ) ).Return( number );
				calculation.Enter( number );
			}

			using ( mockery.Playback( ) ) {
				CreateSUT( ).Execute( );
			}
		}

		[Test]
		public void should_append_addition_operation_to_calculation() {
			using ( mockery.Record( ) ) {
				using ( mockery.Ordered( ) ) {
					calculation.Enter( null );
					LastCall.IgnoreArguments( );
					calculation.Include( Operators.Addition );
				}
			}

			using ( mockery.Playback( ) ) {
				CreateSUT( ).Execute( );
			}
		}

		private INumberBuilder builder;
		private ICurrentCalculation calculation;
		private MockRepository mockery;
	}
}