public void DeepRetrieveFromObjectGraph()
{
// Arrange
Node node = new Node
{
Number = 1,
Parent = new Node
{
Number = 2,
Parent = new Node
{
Number = 3
}
}
};
// Act
var third = node.Maybe()
.Apply(n => n.Parent)
.Apply(n => n.Parent)
.Return();
// Assert
Assert.IsNotNull(third);
Assert.AreEqual(3, third.Number);
}
public void PassingIf()
{
// Arrange
Node node = new Node
{
Number = 1,
Parent = new Node
{
Number = 2,
Parent = new Node
{
Number = 3
}
}
};
// Act
var third = node.Maybe()
.Apply(n => n.Parent)
.If(n => n.Number == 2)
.Apply(n => n.Parent)
.Return(n => n.Number);
// Assert
Assert.AreEqual(3, third);
}
public void PassingDo()
{
// Arrange
Node node = new Node
{
Number = 1,
Parent = new Node
{
Number = 2,
Parent = new Node
{
Number = 3
}
}
};
int blah = 0;
// Act
node.Maybe()
.Apply(n => n.Parent)
.Do(n => blah = n.Number);
// Assert
Assert.AreEqual(2, blah);
}
public void PassingCast()
{
// Arrange
Node node = new Node
{
Number = 1,
Parent = new Node
{
Number = 2,
Parent = new Node
{
Number = 3
}
}
};
// Act
var secondNum = node.Maybe()
.Apply(n => n.Parent)
.Cast<IDoStuff>()
.Return(n => n.Number);
// Assert
Assert.AreEqual(2, secondNum);
}
public void FailingCast()
{
// Arrange
Node node = new Node
{
Number = 1,
Parent = new Node
{
Number = 2,
Parent = new Node
{
Number = 3
}
}
};
// Act
var third = node.Maybe()
.Apply(n => n.Parent)
.Cast<Blah>()
.Apply(n => n.Parent)
.Return(n => n.Number);
// Assert
Assert.AreEqual(0, third);
}
public void DeepRetrieveFromPartialObjectGraph()
{
// Arrange
Node node = new Node
{
Number = 1,
Parent = new Node
{
Number = 2,
}
};
// Act
var third = node.Maybe()
.Apply(n => n.Parent)
.Apply(n => n.Parent)
.Return();
// Assert
Assert.IsNull(third);
}