public void Ancestors_Works()
{
var parent1 = new Strong().AppendTextContent("leaf node text");
parent1.Content.Should().HaveCount(1);
var leafText = parent1.Content.First();
leafText.Should().NotBeNull();
leafText.Should().BeOfType <TextItem>();
(leafText as TextItem) !.Content.Should().Be("leaf node text");
parent1.Parent.Should().BeNull();
parent1.GetAncestors().Should().NotBeNull().And.BeEmpty();
leafText.Parent.Should().Be(parent1);
var initialAncestors = leafText.GetAncestors();
initialAncestors.Should().HaveCount(1);
initialAncestors.Should().Contain(parent1);
var parent2 = new Emphasis().AppendContent(parent1);
var updatedAncestors = leafText.GetAncestors();
updatedAncestors.Should().HaveCount(2);
updatedAncestors.Should().Contain(parent1);
updatedAncestors.Should().Contain(parent2);
}