public void AllowComparison()
{
DiscProgram first = new DiscProgram("a");
DiscProgram second = new DiscProgram("a");
DiscProgram third = new DiscProgram("b");
Assert.True(first.Equals(second));
Assert.False(first.Equals(third));
}
public void HaveNameAndWeight()
{
DiscProgram a = new DiscProgram("a", 1);
DiscProgram b = new DiscProgram("b");
Assert.Equal("a", a.Name);
Assert.Equal(1, a.Weight);
Assert.Equal("b", b.Name);
Assert.Equal(0, b.Weight);
}
public void TrackTotalWeights()
{
DiscProgram a = new DiscProgram("a", 2);
DiscProgram b = new DiscProgram("b", 2);
DiscProgram c = new DiscProgram("c", 2);
a.AddChild(b);
b.AddChild(c);
// The total weight of a disc should be its own weight plus
// the weight of all of its children.
Assert.Equal(2, c.TotalWeight);
Assert.Equal(4, b.TotalWeight);
Assert.Equal(6, a.TotalWeight);
// Adding a new program at the top of the stack should result in
// it inheriting the total weight of all of the discs under it.
DiscProgram d = new DiscProgram("d", 4);
d.AddChild(a);
Assert.Equal(10, d.TotalWeight);
// Adding a new program to the "bottom" should update every disc above it.
DiscProgram e = new DiscProgram("e", 1);
c.AddChild(e);
Assert.Equal(3, c.TotalWeight);
Assert.Equal(5, b.TotalWeight);
Assert.Equal(7, a.TotalWeight);
Assert.Equal(11, d.TotalWeight);
// Adding a new disc somewhere in the middle should update any of the discs that
// are above it in the tree and not change any others.
DiscProgram f = new DiscProgram("f", 1);
b.AddChild(f);
// Unchanged
Assert.Equal(3, c.TotalWeight);
Assert.Equal(1, e.TotalWeight);
// Changed
Assert.Equal(6, b.TotalWeight);
Assert.Equal(8, a.TotalWeight);
Assert.Equal(12, d.TotalWeight);
// Lastly, if we later update the weight of a disc, then the
// tower should update as required.
f.SetWeight(3);
Assert.Equal(8, b.TotalWeight);
Assert.Equal(10, a.TotalWeight);
Assert.Equal(14, d.TotalWeight);
}