public void GetCurrentState_WithValidTransitions_ReturnsAttackState()
{
// Arrange
var idleState = new IdleState();
var chaseState = new ChaseState();
var attackState = new AttackState();
var stateMachine = new StateMachine(3);
stateMachine.Configure(idleState)
.Link((int)Transition.EnemyInProximity, chaseState);
stateMachine.Configure(chaseState)
.Link((int)Transition.EnemyInAttackRange, attackState)
.Link((int)Transition.EnemyOutOfRange, idleState);
stateMachine.Configure(attackState)
.Link((int)Transition.EnemyOutOfAttackRange, chaseState)
.Link((int)Transition.EnemyOutOfRange, idleState);
// Act
stateMachine.PerformTransition((int)Transition.EnemyInProximity);
stateMachine.PerformTransition((int)Transition.EnemyOutOfRange);
stateMachine.PerformTransition((int)Transition.EnemyInProximity);
stateMachine.PerformTransition((int)Transition.EnemyInAttackRange);
// Assert
stateMachine.CurrentState.Should().Be(attackState);
}
public void Configure_WithNullState_ThrowsArgumentNullException()
{
// Arrange
var idleState = new IdleState();
var chaseState = new ChaseState();
var attackState = new AttackState();
var stateMachine = new StateMachine(3);
// Act
Action action = () => stateMachine.Configure(null)
.Link((int)Transition.EnemyInProximity, chaseState);
// Assert
action.Should().Throw <ArgumentNullException>();
}
public void Link_WithExistingTransitionInState_ThrowsException()
{
// Arrange
var idleState = new IdleState();
var chasteState = new ChaseState();
var stateMachine = new StateMachine(2);
// Act
Action action = () => stateMachine.Configure(idleState)
.Link((int)Transition.EnemyInProximity, chasteState)
.Link((int)Transition.EnemyInProximity, chasteState);
// Assert
action.Should().Throw <Exception>();
}
public void PerformTransition_WithNonConfiguredState_ThrowsException()
{
// Arrange
var idleState = new IdleState();
var chaseState = new ChaseState();
var stateMachine = new StateMachine(2);
stateMachine.Configure(idleState)
.Link((int)Transition.EnemyInProximity, chaseState);
// Act
Action action = () => stateMachine.PerformTransition((int)Transition.EnemyInProximity);
// Assert
action.Should().Throw <Exception>();
}
public void Configure_WithMoreStates_ThrowsArgumentOutOfRangeException()
{
// Arrange
var idleState = new IdleState();
var chaseState = new ChaseState();
var attackState = new AttackState();
var stateMachine = new StateMachine(2);
stateMachine.Configure(idleState)
.Link((int)Transition.EnemyInProximity, chaseState);
stateMachine.Configure(chaseState)
.Link((int)Transition.EnemyInAttackRange, attackState)
.Link((int)Transition.EnemyOutOfRange, idleState);
// Act
Action action = () => stateMachine.Configure(attackState);
// Assert
action.Should().Throw <ArgumentOutOfRangeException>();
}
public void Configure_WithAlreadyConfiguredState_ThrowsException()
{
// Arrange
var idleState = new IdleState();
var chaseState = new ChaseState();
var attackState = new AttackState();
var stateMachine = new StateMachine(3);
// Act
stateMachine.Configure(idleState)
.Link((int)Transition.EnemyInProximity, chaseState);
stateMachine.Configure(chaseState)
.Link((int)Transition.EnemyInAttackRange, attackState)
.Link((int)Transition.EnemyOutOfRange, idleState);
Action action = () => stateMachine.Configure(chaseState);
// Assert
action.Should().Throw <Exception>();
}
