package function.builtin.cons;

import static testutil.TestUtilities.*;

import org.junit.Test;

import function.ArgumentValidator.*;

public class LENGTHTester {

    @Test
    public void testLengthOfNil() {
        String input = "(length '())";

        assertSExpressionsMatch(evaluateString(input), parseString("0"));
    }

    @Test
    public void testLengthOfListOfOneElement() {
        String input = "(length '(1))";

        assertSExpressionsMatch(evaluateString(input), parseString("1"));
    }

    @Test
    public void testLengthOfListOfManyElements() {
        String input = "(length '(1 2 3 4 5))";

        assertSExpressionsMatch(evaluateString(input), parseString("5"));
    }

    @Test(expected = BadArgumentTypeException.class)
    public void testLengthWithNonList() {
        evaluateString("(length 'x)");
    }

    @Test(expected = TooManyArgumentsException.class)
    public void testLengthWithTooManyArguments() {
        evaluateString("(length '(1 2) '(1 2))");
    }

    @Test(expected = TooFewArgumentsException.class)
    public void testLengthWithTooFewArguments() {
        evaluateString("(length)");
    }

}