it('should output stringified data if value is object', function () {
assert.strictEqual(utils.guard({a:1}), '{"a":1}')
assert.strictEqual(utils.guard([1,2,3]), '[1,2,3]')
})
it('should output empty string if value is null or undefined', function () {
assert.strictEqual(utils.guard(undefined), '')
assert.strictEqual(utils.guard(null), '')
})