public void ParagraphsAdd_AddsANewTextParagraphAtTheEndOfTheTextBoxAndReturnsAddedParagraph_WhenParagraphIsAddedAfterTextBoxContentChanged()
{
IPresentation presentation = SCPresentation.Open(Properties.Resources._001, true);
IAutoShape autoShape = (IAutoShape)presentation.Slides[0].Shapes.First(sp => sp.Id == 3);
ITextBox textBox = autoShape.TextBox;
IParagraphCollection paragraphs = textBox.Paragraphs;
IParagraph paragraph = textBox.Paragraphs.First();
textBox.Text = "A new text";
// Act
IParagraph newParagraph = paragraphs.Add();
// Assert
newParagraph.Should().NotBeNull();
}