'use strict';
var app = function() {

    var flatten = function(arr) {
        return arr.reduce(function(flat, toFlatten) {
            return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
        }, []);
    };

    var testsuite = function(suitename, testData) {

        var results = {
            total: testData.length,
            passed: 0
        };

        testData.forEach(function(pair) {
            var result = flatten(pair.input);
            if (result.toString() === pair.expected.toString()) {
                results.passed++;
            }
        });
        console.log('Suite: ' + suitename + ', Total: ' + results.total + ', Passed: ' + results.passed);
    };

    var testData = [{
        input: [
            [1, 2, 3],
            [4, 5]
        ],
        expected: [1, 2, 3, 4, 5]
    }, {
        input: [
            [1, 2, [3]], 4
        ],
        expected: [1, 2, 3, 4]
    }, {
        input: [
            [1],
            [2, 3, [4, [5, 6], 7, 8]],
            [9]
        ],
        expected: [1, 2, 3, 4, 5, 6, 7, 8, 9]
    }];

    testsuite('Test suite', testData);
}();