public void Should_Throw_ArgumentException_When_Invalid_Input_Is_Passed()
{
var provider = new ParenthesisTokenProvider();
var expression = " ";
Assert.Throws <ArgumentException>(() => provider.GetToken(0, expression));
}
public void Should_Return_OpenBracketToken()
{
var provider = new ParenthesisTokenProvider();
var expression = "(";
var result = provider.GetToken(0, expression);
Assert.Equal(0, result.StartIndex);
Assert.Equal(0, result.EndIndex);
Assert.IsType <OpenParenthesisToken>(result.Token);
Assert.Equal("(", result.Token.Value);
}
