public void CollapseWhitespacesTest()
{
var input = new TextInputRange {
File = new TextFile {
Content = "AB C",
Filename = ""
}
};
input.Extend(nChars: 2);
input.CollapseWhitespaces();
Assert.AreEqual(expected: 'C', actual: input.EndChar);
Assert.AreEqual(expected: "", actual: input.Text);
}