public void IsCircleFull()
{
WordTargetLayout layout = new WordTargetLayout(new List <string> {
"VARIABLE", "VALUE", "VAGUE", "UNCLEAR", "NUCLEAR", "CORE", "CORN", "COIN", "JOIN", "STATE"
});
layout.AssignWord("VALUE", 3);
layout.AssignWord("VAGUE", 3);
layout.AssignWord("UNCLEAR", 3);
layout.AssignWord("NUCLEAR", 3);
Assert.AreEqual(false, layout.IsCircleFull(3));
layout.AssignWord("CORE", 3);
layout.AssignWord("CORN", 3);
layout.AssignWord("COIN", 3);
layout.AssignWord("JOIN", 3);
Assert.ThrowsException <System.Exception>(() => layout.IsCircleFull(1));
Assert.ThrowsException <System.Exception>(() => layout.IsCircleFull(6));
Assert.AreEqual(true, layout.IsCircleFull(3));
}