--- /dev/null
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use Test::More tests => 28;
+
+my $lazy_run = 0;
+
+do {
+ package Class;
+ use Mouse;
+
+ has lazy => (
+ is => 'rw',
+ lazy => 1,
+ default => sub { ++$lazy_run },
+ predicate => 'has_lazy',
+ clearer => 'clear_lazy',
+ );
+};
+
+can_ok(Class => 'clear_lazy');
+
+my $object = Class->new;
+is($lazy_run, 0, "lazy attribute not yet initialized");
+
+ok(!$object->has_lazy, "no lazy value yet");
+is($lazy_run, 0, "lazy attribute not initialized by predicate");
+
+$object->clear_lazy;
+is($lazy_run, 0, "lazy attribute not initialized by clearer");
+
+ok(!$object->has_lazy, "no lazy value yet");
+is($lazy_run, 0, "lazy attribute not initialized by predicate");
+
+is($object->lazy, 1, "lazy value");
+is($lazy_run, 1, "lazy coderef invoked once");
+
+ok($object->has_lazy, "lazy value now");
+is($lazy_run, 1, "lazy coderef invoked once");
+
+is($object->lazy, 1, "lazy value is cached");
+is($lazy_run, 1, "lazy coderef invoked once");
+
+$object->clear_lazy;
+is($lazy_run, 1, "lazy coderef not invoked by clearer");
+
+ok(!$object->has_lazy, "no value now, clearer removed it");
+is($lazy_run, 1, "lazy attribute not initialized by predicate");
+
+is($object->lazy, 2, "new lazy value; previous was cleared");
+is($lazy_run, 2, "lazy coderef invoked twice");
+
+my $object2 = Class->new(lazy => 'very');
+is($lazy_run, 2, "lazy attribute not initialized when an argument is passed to the constructor");
+
+ok($object2->has_lazy, "lazy value now");
+is($lazy_run, 2, "lazy attribute not initialized when checked with predicate");
+
+is($object2->lazy, 'very', 'value from the constructor');
+is($lazy_run, 2, "lazy coderef not invoked, we already have a value");
+
+$object2->clear_lazy;
+is($lazy_run, 2, "lazy attribute not initialized by clearer");
+
+ok(!$object2->has_lazy, "no more lazy value");
+is($lazy_run, 2, "lazy attribute not initialized by predicate");
+
+is($object2->lazy, 3, 'new lazy value');
+is($lazy_run, 3, "lazy value re-created");
+