public void Execute_doesnt_change_state_if_condition_not_met() { const SaleState startState = SaleState.Open; const SaleState endState = SaleState.Complete; var sale = new Sale(saleID: 66) { State = startState }; var sut = new StateTransition <Sale, SaleState, SaleEvent>( stateAccessor: saleToUpdate => saleToUpdate.State , stateMutator: (saleToUpdate, newState) => saleToUpdate.State = newState , toState: endState , condition: (_) => false , name: "test" , priority: 1); var result = sut.Execute(new ExecutionParameters <Sale, SaleEvent>(SaleEvent.Pay, sale)); Assert.False(result.WasTransitioned); Assert.Equal(startState, sale.State); }