public void Attack_ShouldThrowInvalidOperationExceptionWhenTheHeroHasNoHealth()
{
//Arrange
IHero hero = new HeroBuilder().WithHealth(0).Build();
IHero opponent = new HeroBuilder().Build();
//Act + Assert
Assert.That(() => hero.Attack(opponent), Throws.InstanceOf <InvalidOperationException>());
}
public void Attack_SuperMode_ShouldAttackOpponentWithDoubleStrength()
{
//Arrange
IHero hero = new HeroBuilder().WithSuperModeLikeliness(1.0f).Build();
Mock <IHero> opponentMock = new HeroMockBuilder().Build();
//Act
hero.Attack(opponentMock.Object);
//Assert
opponentMock.Verify(opponent => opponent.DefendAgainstAttack(hero.Strength * 2), Times.Once,
$"Should call 'DefendAgainstAttack' of opponent with strength {hero.Strength * 2}.");
}
private void AssertSuperModeLikelinessForAttack(float superModeLikeliness)
{
IHero hero = new HeroBuilder().WithSuperModeLikeliness(superModeLikeliness).Build();
int numberOfAttacks = 200;
int numberOfNormalAttacks = 0;
int numberOfSuperAttacks = 0;
for (int i = 0; i < numberOfAttacks; i++)
{
Mock <IHero> opponentMock = new HeroMockBuilder().Build();
opponentMock.Setup(opponent => opponent.DefendAgainstAttack(It.IsAny <int>()))
.Callback((int attackStrength) =>
{
if (attackStrength == hero.Strength)
{
numberOfNormalAttacks++;
}
else if (attackStrength == hero.Strength * 2)
{
numberOfSuperAttacks++;
}
});
hero.Attack(opponentMock.Object);
}
Assert.That(numberOfNormalAttacks, Is.GreaterThan(0),
$"Out of {numberOfAttacks} attacks, no normal attack happened. That is not random enough.");
Assert.That(numberOfSuperAttacks, Is.GreaterThan(0),
$"Out of {numberOfAttacks} attacks, no supermode attack happened. That is not random enough.");
Assert.That(numberOfSuperAttacks + numberOfNormalAttacks, Is.EqualTo(numberOfAttacks),
$"The amount of normal attacks ({numberOfNormalAttacks}) " +
$"added with the number of supermode attacks ({numberOfSuperAttacks}) " +
$"should be equal to the total number of attacks ({numberOfAttacks}).");
double actualSuperMode = numberOfSuperAttacks / (double)numberOfAttacks;
Assert.That(actualSuperMode, Is.EqualTo(hero.SuperModeLikeliness).Within(0.15),
$"After {numberOfAttacks} attacks the supermode likeliness seems to be around {Convert.ToInt32(actualSuperMode * 100)}%. " +
$"It should be around {Convert.ToInt32(hero.SuperModeLikeliness * 100)}%.");
}
