nodeunit spec helper file

spec_helper.js

var group_name = false, EXT_EXP;
function it(should, test_case) {
    check_external_exports();
    if (group_name) {
        EXT_EXP[group_name][should] = test_case;
    } else {
        EXT_EXP[should] = test_case;
    }
}

global.it = it;

function context(name, tests) {
    check_external_exports();
    EXT_EXP[name] = {};
    group_name = name;
    tests({
        before: function (f) {
            it('setUp', f);
        },
        after: function (f) {
            it('tearDown', f);
        }
    });
    group_name = false;
}

global.context = context;

exports.init = function (external_exports) {
    EXT_EXP = external_exports;
};

function check_external_exports() {
    if (!EXT_EXP) throw new Error(
        'Before run this, please ensure that ' +
        'require("spec_helper").init(exports); called');
}

test.js

require('./spec_helper').init(exports);

it('should be done', function (test) {
    test.done();
});

context('rain', function (each) {

    each.before(prepare_rain);

    each.after(dry_ground);

    it('should falling down', function (test) {
        test.done();
    });

    it('should make ground wet', function (test) {
        test.done();
    });
});