public void TestAppendToStringBuilder()
{
StringSegment seg = new StringSegment("hey", 1, 1);
StringBuilder sb = new StringBuilder();
seg.AppendToStringBuilder(sb);
Assert.AreEqual("e", sb.ToString());
}
public void TestAppendToNullStringBuilder()
{
StringSegment seg = new StringSegment("hey", 1, 1);
Assert.Throws <ArgumentNullException>(() => seg.AppendToStringBuilder(null));
}