public void CanBeInsertedInto()
{
ContainerBlock container = new MockContainerBlock();
var one = new ParagraphBlock();
container.Insert(0, one);
Assert.AreEqual(1, container.Count);
Assert.AreSame(container[0], one);
var two = new ParagraphBlock();
container.Insert(1, two);
Assert.AreEqual(2, container.Count);
Assert.AreSame(container[0], one);
Assert.AreSame(container[1], two);
var three = new ParagraphBlock();
container.Insert(0, three);
Assert.AreEqual(3, container.Count);
Assert.AreSame(container[0], three);
Assert.AreSame(container[1], one);
Assert.AreSame(container[2], two);
Assert.Throws <ArgumentNullException>(() => container.Insert(0, null));
Assert.Throws <ArgumentOutOfRangeException>(() => container.Insert(4, new ParagraphBlock()));
Assert.Throws <ArgumentOutOfRangeException>(() => container.Insert(-1, new ParagraphBlock()));
Assert.Throws <ArgumentException>(() => container.Insert(0, one)); // one already has a parent
}
public void Contains()
{
var container = new MockContainerBlock();
var block = new ParagraphBlock();
Assert.False(container.Contains(block));
container.Add(block);
Assert.True(container.Contains(block));
container.Add(new ParagraphBlock());
Assert.True(container.Contains(block));
container.Insert(0, new ParagraphBlock());
Assert.True(container.Contains(block));
}
public void CanBeSet()
{
ContainerBlock container = new MockContainerBlock();
var one = new ParagraphBlock();
container.Insert(0, one);
Assert.AreEqual(1, container.Count);
Assert.AreSame(container[0], one);
Assert.AreSame(container, one.Parent);
var two = new ParagraphBlock();
container[0] = two;
Assert.AreSame(container, two.Parent);
Assert.Null(one.Parent);
Assert.Throws <ArgumentException>(() => container[0] = two); // two already has a parent
}
