public async Task RollingDiceWithZeroSidesIsInvalid()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
Func <Task> task = async() => await diceRoller.Roll("1d0");
await task.Should().ThrowAsync <InvalidOperationException>();
}
public async Task SubtractingAConstantFromDiceIsValid()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("2d6-10");
result.ExpressionTotal.Should().Be(-7);
result.DiceRolls.Should().BeEquivalentTo(rng.Take(2));
}
public async Task SubtractingTwoDiceIsValid()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("2d6-1d5");
result.ExpressionTotal.Should().Be(0);
result.DiceRolls.Should().BeEquivalentTo(rng);
}
public async Task WhenNoCountIsSpecifiedOneDiceIsRolled()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("d6");
result.ExpressionTotal.Should().Be(1);
result.DiceRolls.Should().BeEquivalentTo(rng.Take(1));
}
public async Task RollingZeroDiceIsValid()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("0d6");
result.ExpressionTotal.Should().Be(0);
result.DiceRolls.Should().BeEmpty();
}
public async Task ParenthesesTakePrecedence()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("(3d6+2)*2");
result.ExpressionTotal.Should().Be(16);
result.DiceRolls.Should().BeEquivalentTo(rng);
}
public async Task MultiplyingTakesPrecedenceOverAdding()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("3d6+2*2");
result.ExpressionTotal.Should().Be(10);
result.DiceRolls.Should().BeEquivalentTo(rng);
}
public async Task RollingSimpleDiceExpressionIsValid()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("3d6");
result.ExpressionTotal.Should().Be(6);
result.DiceRolls.Should().BeEquivalentTo(rng);
}
public async Task DividingDiceByAConstantIsValid()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("3d6/2");
result.ExpressionTotal.Should().Be(3);
result.DiceRolls.Should().BeEquivalentTo(rng);
}
public async Task MultiplyingDiceByAConstantIsValid()
{
var rng = new FakeDiceRng {
1, 2, 3
};
var diceRoller = new DiceRoller(rng);
var result = await diceRoller.Roll("2d6*2");
result.ExpressionTotal.Should().Be(6);
result.DiceRolls.Should().BeEquivalentTo(rng.Take(2));
}
