public void Traverse()
{
// Arrange
var tree = new TernaryTree(Language.Swedish);
tree.Add("abe", "abc", "abd");
var visited = new List<string>();
// Act
tree.Traverse(visited.Add);
// Assert
var expected = new List<string> { "abc", "abd", "abe" };
Assert.AreEqual(expected.Count, visited.Count);
Assert.AreEqual(expected[0], visited[0]);
Assert.AreEqual(expected[1], visited[1]);
Assert.AreEqual(expected[2], visited[2]);
}