Noticeably Different - Unit Testing

using System.Noticeably.Different.WebSite;

November 19, 2008 NoticeablyDifferent

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Testing The State Pattern

#region Code

public abstract class State {

public abstract void Handle(Context context);

}

public class ConcreteStateA : State {

public override void Handle(Context context) {

//Do something

}

public class ConcreteStateB : State {

public override void Handle(Context context) {

//Do something different

}

public class Context {

private State state;

public Context(State state) {

this.state = state;

}

public State State {

get { return state; }

set { state = value; }

}

public void Request() {

state.Handle(this);

}

#endregion

#region Unit Tests

public class MockState : State {

public override void Handle(Context context) {

//Mock something

}

public class SecondMockState : State {

public override void Handle(Context context) {

//Mock something

}

[TestFixture]

public class ContextTests {

private Context context;

private State state;

public ContextTests() { }

[SetUp]

public void SetUp() {

state = new MockState();

}

[Test]

public void InitialStateIsStateAssignedInConstructor() {

context = new Context(state);

Assert.AreSame(state, context.State);

}

[Test]

public void RequestPerformsAssignedStateHandle() {

context = new Context(state);

context.Request();

//Assert that the Handle method of MockState is called.

}

[Test]

public void SetContextStateChangesState() {

State secondState = new SecondMockState();

context = new Context(state);

Assert.AreSame(state, context.State, "State is first state");

context.State = secondState;

Assert.AreSame(secondState, context.State, "State is second state");

}

#endregion