function testObserve()
{
$foo = \arc\prototype::create([]);
$f = function ($ob, $name, $value) {
return false;
};
\arc\prototype::observe($foo, $f);
$foo->bar = 'bar';
$this->assertArrayNotHasKey('bar', \arc\prototype::entries($foo));
\arc\prototype::unobserve($foo, $f);
$foo->bar = 'bar';
$this->assertEquals($foo->bar, 'bar');
\arc\prototype::observe($foo, $f);
$foo->bar = 'baz';
$this->assertEquals($foo->bar, 'bar');
}
