public void CombinedWith_1_and_1_equals_1()
{
var p1 = new Probability(1m);
var p2 = new Probability(1m);
Assert.AreEqual(new Probability(1m), p1.CombinedWith(p2));
Assert.AreEqual(new Probability(1m), p2.CombinedWith(p1));
}
public void CombinedWith_including_0_probability_equals_zero()
{
var p0 = new Probability(0m);
var p050 = new Probability(0.5m);
var p1 = new Probability(1m);
var expectedResult = new Probability(0m);
Assert.AreEqual(expectedResult, p0.CombinedWith(p1));
Assert.AreEqual(expectedResult, p1.CombinedWith(p0));
Assert.AreEqual(expectedResult, p050.CombinedWith(p0));
Assert.AreEqual(expectedResult, p0.CombinedWith(p050));
}
public void Constructor_value_too_low()
{
try
{
var p = new Probability(-0.01m);
Assert.Fail("Should've thrown an OutOfRangeException");
}
catch (ArgumentOutOfRangeException ex)
{
Assert.AreEqual("value", ex.ParamName);
}
}
public void CombinedWith_0_25_and_0_75_equals_0_1875()
{
var p1 = new Probability(0.25m);
var p2 = new Probability(0.75m);
Assert.AreEqual(new Probability(0.1875m), p1.CombinedWith(p2));
Assert.AreEqual(new Probability(0.1875m), p2.CombinedWith(p1));
}
public void InverseOf_0_75_is_0_25()
{
var p = new Probability(0.75m).InverseOf();
Assert.AreEqual(new Probability(0.25m), p);
}
public void InverseOf_zero_is_1()
{
var p = new Probability(0m).InverseOf();
Assert.AreEqual(new Probability(1m), p);
}
public void ConstructorWithNegativeInfinity()
{
try
{
var pNan = new Probability(float.NegativeInfinity);
Assert.Fail("Should've thrown an ArgumentOutOfRangeException.");
}
catch (ArgumentOutOfRangeException) { }
}
public void OperatorValidations()
{
var p0 = new Probability(0m);
var p1 = new Probability(0.25m);
var p2 = new Probability(0.75m);
Assert.IsTrue(p0 < p1);
Assert.IsTrue(p1 < p2);
Assert.IsFalse(p0 < p0);
Assert.IsFalse(p1 < p1);
Assert.IsFalse(p2 < p2);
Assert.IsFalse(p1 < p0);
Assert.IsFalse(p2 < p0);
Assert.IsFalse(p2 < p1);
Assert.IsFalse(p0 > p1);
Assert.IsFalse(p1 > p2);
Assert.IsFalse(p0 > p0);
Assert.IsFalse(p1 > p1);
Assert.IsFalse(p2 > p2);
Assert.IsTrue(p1 > p0);
Assert.IsTrue(p2 > p0);
Assert.IsTrue(p2 > p1);
Assert.IsFalse(p0 == p1);
Assert.IsFalse(p0 == p2);
Assert.IsFalse(p1 == p2);
Assert.IsTrue(p0 == p0);
Assert.IsTrue(p1 == p1);
Assert.IsTrue(p2 == p2);
Assert.IsTrue(p0 != p1);
Assert.IsTrue(p0 != p2);
Assert.IsTrue(p1 != p2);
Assert.IsFalse(p0 != p0);
Assert.IsFalse(p1 != p1);
Assert.IsFalse(p2 != p2);
Assert.IsTrue(p0 <= p1);
Assert.IsTrue(p1 <= p2);
Assert.IsTrue(p0 <= p0);
Assert.IsTrue(p1 <= p1);
Assert.IsTrue(p2 <= p2);
Assert.IsFalse(p1 <= p0);
Assert.IsFalse(p2 <= p0);
Assert.IsFalse(p2 <= p1);
Assert.IsFalse(p0 >= p1);
Assert.IsFalse(p1 >= p2);
Assert.IsTrue(p0 >= p0);
Assert.IsTrue(p1 >= p1);
Assert.IsTrue(p2 >= p2);
Assert.IsTrue(p1 >= p0);
Assert.IsTrue(p2 >= p0);
Assert.IsTrue(p2 >= p1);
}
public void OperatorValidationsWithNulls()
{
var p0 = new Probability(0m);
var p1 = new Probability(0.25m);
var p2 = new Probability(0.75m);
Assert.IsFalse(p0 < null);
Assert.IsFalse(p1 < null);
Assert.IsFalse(p0 < null);
Assert.IsTrue(null < p0);
Assert.IsTrue(null < p1);
Assert.IsTrue(null < p2);
Assert.IsTrue(p0 > null);
Assert.IsTrue(p1 > null);
Assert.IsTrue(p0 > null);
Assert.IsFalse(null > p0);
Assert.IsFalse(null > p1);
Assert.IsFalse(null > p2);
Assert.IsFalse(p0 == null);
Assert.IsFalse(p1 == null);
Assert.IsFalse(p2 == null);
Assert.IsFalse(null == p0);
Assert.IsFalse(null == p1);
Assert.IsFalse(null == p2);
Assert.IsTrue(p0 != null);
Assert.IsTrue(p1 != null);
Assert.IsTrue(p2 != null);
Assert.IsTrue(null != p0);
Assert.IsTrue(null != p1);
Assert.IsTrue(null != p2);
Assert.IsFalse(p0 <= null);
Assert.IsFalse(p1 <= null);
Assert.IsFalse(p2 <= null);
Assert.IsTrue(null <= p0);
Assert.IsTrue(null <= p1);
Assert.IsTrue(null <= p2);
Assert.IsTrue(p0 >= null);
Assert.IsTrue(p1 >= null);
Assert.IsTrue(p2 >= null);
Assert.IsFalse(null >= p0);
Assert.IsFalse(null >= p1);
Assert.IsFalse(null >= p2);
}
public void Either_0_25_and_0_75_equals_0_8125()
{
var p1 = new Probability(0.25m);
var p2 = new Probability(0.75m);
Assert.AreEqual(new Probability(0.8125m), p1.Either(p2));
Assert.AreEqual(new Probability(0.8125m), p2.Either(p1));
}
public void Either_1_and_1_equals_1()
{
var p1 = new Probability(1m);
var p2 = new Probability(1m);
Assert.AreEqual(new Probability(1m), p1.Either(p2));
Assert.AreEqual(new Probability(1m), p2.Either(p1));
}
public void Either_including_0_probability_equals_other_value()
{
var p0 = new Probability(0m);
var p050 = new Probability(0.5m);
var p1 = new Probability(1m);
Assert.AreEqual(new Probability(1m), p0.Either(p1));
Assert.AreEqual(new Probability(1m), p1.Either(p0));
Assert.AreEqual(new Probability(0.5m), p0.Either(p050));
Assert.AreEqual(new Probability(0.5m), p050.Either(p0));
}
public Probability Either(Probability other)
{
return new Probability(_value + other._value - (_value * other._value));
}
public Probability CombinedWith(Probability other)
{
return new Probability(_value * other._value);
}