public void Multiply_Follows_The_Properties_Of_Multiplication() {
// Arrange
var calc = new Calculator();
// Act
var itMultiplies = calc.Multiply(3, 5) == 15 && calc.Multiply(-1, -3) == 3 && calc.Multiply(2, -1) == -2;
var conmutative = calc.Multiply(3, 2) == calc.Multiply(2, 3);
var associative = calc.Multiply(1, calc.Multiply(2, 3)) == calc.Multiply(calc.Multiply(1, 2), 3);
var multiplicativeIdentitity = calc.Multiply(3, 1) == 3;
var distributiveSum = calc.Multiply(2, calc.Sum(1, 3)) == calc.Sum(calc.Multiply(2, 1), calc.Multiply(2, 3));
var distributiveSubstraction = calc.Multiply(2, calc.Substract(1, 3)) ==
calc.Substract(calc.Multiply(2, 1), calc.Multiply(2, 3));
//Assert
Assert.IsTrue(itMultiplies, "Multiplication");
Assert.IsTrue(conmutative, "Conmutative");
Assert.IsTrue(associative, "Associative");
Assert.IsTrue(multiplicativeIdentitity, "Multiplicative identity");
Assert.IsTrue(distributiveSum, "Distributive sum");
Assert.IsTrue(distributiveSubstraction, "Distributive substraction");
}
public void Substract_Follows_The_Properties_Of_Substraction() {
// Arrange
var calc = new Calculator();
// Act
var itSubstracts = calc.Substract(3, 5) == -2 && calc.Substract(-1, -3) == 2 && calc.Substract(10, 3) == 7;
var conmutative = calc.Substract(1, 2) == calc.Substract(2, 1);
var associative = calc.Substract(1, calc.Substract(2, 3)) == calc.Substract(calc.Substract(1, 2), 3);
var identity = calc.Substract(1, 0) == 1;
var distributive = calc.Multiply(2, calc.Substract(1, 3)) ==
calc.Substract(calc.Multiply(2, 1), calc.Multiply(2, 3));
//Assert
Assert.IsTrue(itSubstracts, "Substraction");
Assert.IsFalse(conmutative, "Conmutative");
Assert.IsFalse(associative, "Associative");
Assert.IsTrue(identity, "Identity");
Assert.IsTrue(distributive, "Distributive");
}
