stripe-test.html

<script>
    @if (App::environment('local'))
        var $el = $("#card-number");
        window.stripeData = {
            valid: function() {
                $el.val('4242424242424242');
            },
            successAddressFail: function() {
                $el.val('4000000000000028');
            },
            successZipFail: function() {
                $el.val('4000000000000036');
            },
            fail: function() {
                $el.val('4000000000000002');
            },
            failNumber: function() {
                $el.val('4242424242424241');
            },
            failCVC: function() {
                $el.val('4000000000000127');
            },
            failExpired: function() {
                $el.val('4000000000000069');
            },
            failProcessingError: function() {
                $el.val('4000000000000119');
            }
        }
    @endif
</script>

For more reference see this post: JavaScript Helper for Triggering Stripe Failures