transcendental-lisp/test/function/builtin/PLUSTester.java

package function.builtin;

import static testutil.TestUtilities.*;

import org.junit.Test;

import function.ArgumentValidator.BadArgumentTypeException;
import sexpression.LispNumber;

public class PLUSTester {

    @Test
    public void testPlusWithNoArguments() {
        String input = "(+)";

        assertSExpressionsMatch(evaluateString(input), new LispNumber("0"));
    }

    @Test
    public void testPlusWithOneNumber() {
        String input = "(+ 27)";

        assertSExpressionsMatch(evaluateString(input), new LispNumber("27"));
    }

    @Test
    public void testPlusWithTwoNumbers() {
        String input = "(+ 5 3)";

        assertSExpressionsMatch(evaluateString(input), new LispNumber("8"));
    }

    @Test
    public void testPlusWithManyNumbers_PositiveResult() {
        String input = "(+ 200 100 10 5)";

        assertSExpressionsMatch(evaluateString(input), new LispNumber("315"));
    }

    @Test
    public void testPlusWithManyNumbers_NegativeResult() {
        String input = "(+ 100 (- 200) 20 5)";

        assertSExpressionsMatch(evaluateString(input), new LispNumber("-75"));
    }

    @Test(expected = BadArgumentTypeException.class)
    public void testPlusWithNonNumber() {
        evaluateString("(+ 'a 'b)");
    }

}