public void should_throw_if_expression_contains_invalid_token()
{
var evaluator = new InfixToPostfixEvaluator();
string[] expression = { "1", "+", "2", "wtf", "3" };
Assert.Throws <ArgumentException>(() => evaluator.Evaluate(expression));
}
public void should_detect_simple_syntax_error()
{
var evaluator = new InfixToPostfixEvaluator();
string[] expression = { "+", "1", "+", "2", "-", "3" };
Assert.Throws <ArgumentException>(() => evaluator.Evaluate(expression));
}
public void should_calculate_plus()
{
var evaluator = new InfixToPostfixEvaluator();
string[] expression = { "1", "+", "2" };
string[] postfixExpression = evaluator.Evaluate(expression);
Assert.Equal(new [] { "1", "2", "+" }, postfixExpression);
}
public void should_calculate_mixed_plus_minors_times_div()
{
var evaluator = new InfixToPostfixEvaluator();
string[] expression = { "10", "+", "2", "*", "8", "-", "3" };
string[] postfixExpression = evaluator.Evaluate(expression);
Assert.Equal(new [] { "10", "2", "8", "*", "+", "3", "-" }, postfixExpression);
}