public void SimpleParsing()
{
IToken[] tokens =
{
new Term(1, "x"),
new Operator('-'),
new LeftParenthesis(),
new Term(3, "y"),
new Operator('-'),
new Term(2, "y"),
new RightParenthesis(),
new Operator('='),
new Term(0, string.Empty)
};
IToken[] expected =
{
new Term(1, "x"),
new Operator('-'),
new Term(3, "y"),
new Operator('+'),
new Term(2, "y"),
new Operator('='),
new Term(0, string.Empty)
};
var parenthesisRemover = new ParenthesisRemover();
var result = parenthesisRemover.RemoveParenthesis(tokens);
Assert.Equal(expected, result);
}
public void NotEnoughBracesError()
{
IToken[] tokens =
{
new LeftParenthesis(),
new RightParenthesis(),
new RightParenthesis()
};
var parenthesisRemover = new ParenthesisRemover();
var exception = Assert.Throws <InvalidOperationException>(() => parenthesisRemover.RemoveParenthesis(tokens));
Assert.Contains("Right parenthesis is placed before the left one", exception.Message);
}
public void TooManyBracesError()
{
IToken[] tokens =
{
new LeftParenthesis(),
new LeftParenthesis(),
new RightParenthesis()
};
var parenthesisRemover = new ParenthesisRemover();
var exception = Assert.Throws <InvalidOperationException>(() => parenthesisRemover.RemoveParenthesis(tokens));
Assert.Equal("1 left parenthesis are not balanced", exception.Message);
}