alvarocastro/roll

const test = require('ava');
const roll = require('.');

roll.random = function () {
    return 1;
};

test('Should return a number', t => {
    t.is(typeof roll('1d6'), 'number');
    t.is(typeof roll('1d6+1'), 'number');
    t.is(typeof roll('2d6-1d3'), 'number');
    t.is(typeof roll('1d6*1d6'), 'number');
});

test('Should work with single roll inputs', t => {
    t.is(roll('1d6'), 6);
    t.is(roll('1d10'), 10);
    t.is(roll('2d3'), 6);
    t.is(roll('5d5'), 25);
    t.is(roll('d20'), 20);
    t.is(roll('3d%'), 300);
});

test('Should support basic mathematical expressions', t => {
    t.is(roll('1d6+3'), 9);
    t.is(roll('1d6-10'), -4);
    t.is(roll('2d6-1d10'), 2);
    t.is(roll('1d6*1d6'), 36);
    t.is(roll('1d2/1d3'), 0.67);
});

test('Should support % for 100-sided dices', t => {
    t.is(roll('1d%'), 100);
    t.is(roll('2d%'), 200);
    t.is(roll('1d%+1'), 101);
});

test('Should return detailed information', t => {
    t.deepEqual(roll.detailed('1d6'), {
        result: 6,
        rolls: [
            {
                roll: '1d6',
                result: [6]
            }
        ]
    });
    t.deepEqual(roll.detailed('2d10+4'), {
        result: 24,
        rolls: [
            {
                roll: '2d10',
                result: [10, 10]
            }
        ]
    });
    t.deepEqual(roll.detailed('2d10-1d6'), {
        result: 14,
        rolls: [
            {
                roll: '2d10',
                result: [10, 10]
            },
            {
                roll: '1d6',
                result: [6]
            }
        ]
    });
});

test('Should throw error on invalid input', t => {
    t.throws(() => {
        return roll('bad');
    }, {
        instanceOf: Error,
        message: '"bad" is not a valid roll'
    });

    t.throws(() => {
        return roll('1d');
    }, {
        instanceOf: Error,
        message: '"1d" is not a valid roll'
    });

    t.throws(() => {
        return roll('3');
    }, {
        instanceOf: Error,
        message: '"3" is not a valid roll'
    });
});