public void ThrowsWhenTooFewArgumentsForOperator()
{
var tokens = new Token[]
{
new Argument(-3.7),
new SumOperator()
};
var expression = new RpnExpression(tokens);
var result = expression.CalculateResult();
}
public void DisplaysReadableExpressionRepresentation()
{
var tokens = new Token[]
{
new Argument(89),
new Argument(3.5),
new SumOperator()
};
var expression = new RpnExpression(tokens);
Assert.AreEqual("89 3.5 +", expression.ToString());
}
public void ThrowsIfTooManyTokensInExpression()
{
var tokens = new Token[]
{
new Argument(4.5),
new Argument(7),
new SumOperator(),
new Argument(-1)
};
var expression = new RpnExpression(tokens);
var result = expression.CalculateResult();
}
public void ThrowsIfTokensNull()
{
var expression = new RpnExpression(null);
}
public void ThrowsIfTokensEmpty()
{
var expression = new RpnExpression(new Token[] { });
}
public void CreatesExpressionWithOneToken()
{
var expression = new RpnExpression(new Token[] { new Argument(5) });
Assert.IsNotNull(expression);
}
public void CreatesExpressionWithManyTokens()
{
var expression = new RpnExpression(new Token[] { new Argument(1), new Argument(-8.4), new SumOperator() });
}
private void CheckResult(IEnumerable<Token> tokens, double expectedResult)
{
var expression = new RpnExpression(tokens);
Assert.AreEqual(expectedResult, expression.CalculateResult());
}