package function.builtin.predicate;

import static testutil.TestUtilities.*;

import org.junit.Test;

import function.ArgumentValidator.*;

public class NULLTester {

    @Test
    public void testNilIsNull() {
        String input = "(null ())";

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

    @Test
    public void testListIsNotNull() {
        String input = "(null '(1))";

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

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

    @Test(expected = TooManyArgumentsException.class)
    public void testNullWithTooManyArguments() {
        evaluateString("(null 1 2)");
    }

}