public void EvaluateStringCharAt()
{
Assert.AreEqual("f", this.EvaluateExpression("'foobar'.charAt(0)"));
Assert.AreEqual("b", this.EvaluateExpression("'foobar'.charAt(3)"));
Assert.AreEqual(string.Empty, this.EvaluateExpression("'foobar'.charAt(-2)"));
Assert.AreEqual(string.Empty, this.EvaluateExpression("'foobar'.charAt(100)"));
}