public void Cannot_add_self_to_chain()
{
var x = new TestChain("1");
Assert.Throws <ArgumentException>(
() => x.And(x)
);
}
public void Calls_self_and_next_via_element_interface()
{
var first = new TestChain("42");
var next = new TestChain("4242");
var chain = first.And(next);
Assert.Equal(new[] { "42", "4242" }, chain.GetValues());
}
public void Cannot_add_existing_element_to_chain()
{
var one = new TestChain("1");
var two = new TestChain("2");
var zero = new TestChain("0").And(one).And(two);
Assert.Throws <ArgumentException>(
() => zero.And(zero.Next)
);
}
public void Concatenates_two_chains()
{
var first = new TestChain("1").And(new TestChain("2"));
var second = new TestChain("3").And(new TestChain("4"));
Assert.Equal(new[] { "1", "2" }, first.GetValues());
Assert.Equal(new[] { "3", "4" }, second.GetValues());
var result = first.And(second);
Assert.NotSame(first, result);
Assert.Equal(new[] { "1", "2", "3", "4" }, result.GetValues());
}