package function.builtin.predicate;

import static testutil.TestUtilities.*;

import org.junit.Test;

import function.ArgumentValidator.*;

public class LESSPTester {

    @Test
    public void testLesspWithOneNumber_ReturnsT() {
        String input = "(< 1)";

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

    @Test
    public void testLesspWithTwoNumbers_ReturnsNil() {
        String input = "(< 2 1)";

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

    @Test
    public void testLesspWithTwoNumbers_ReturnsT() {
        String input = "(< 2 3)";

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

    @Test
    public void testLesspWithManyNumbers_ReturnsNil() {
        String input = "(< 4 3 2 5 1)";

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

    @Test
    public void testLesspWithManyNumbers_ReturnsT() {
        String input = "(< 0 1 2 3 4)";

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

    @Test(expected = BadArgumentTypeException.class)
    public void testLesspWithNonNumbers() {
        evaluateString("(< '(1) '(2))");
    }

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

}