'use strict';

const test = {
    it: function(tests, next) {
        // capture results
        let failed = [];
        let passed = [];

        // loop through tests
        Object.keys(tests).forEach(function(name) {
            let test = tests[name];

            // execute
            try {
                test();
                passed.push(`\n+ ${name}`);
            } catch (err) {
                // TODO: include error stack option
                // let back = err.stack.split('\n')[2];
                // let re = /(?<=\()(.*?)(?=\))/g;
                // let trace = re.exec(back)[0];
                failed.push(`\n- ${name}`);
                console.error(err);
                // failed.push(`\n- ${name} - - ${trace}`);
            }
        });

        // summary
        if(typeof next === 'function') {
            return next({
                pass: passed,
                fail: failed
            });
        } else {
            console.log(...passed, ...failed);
            console.log(`\n# tests ${failed.length + passed.length} pass ${passed.length} fail ${failed.length}`);

            return failed.length ? false : true;
        }
    },
    assert: function (e, a) { if (e != a) throw Error(`expected ${e} == ${a}`); },
    equals: function (e, a) { if (e !== a) throw Error(`expected ${e} === ${a}`); },
    exists: function (v) { if (!v) throw Error(`exists value ${v}`); },
    pass: function () { return true; },
    fail: function (m) { throw Error(m); }
}