public function testHelpers()
{
$foo = array($this, 'getFoo');
$bar = 'BAR';
$mustache = new Mustache_Engine(array('helpers' => array('foo' => $foo, 'bar' => $bar)));
$helpers = $mustache->getHelpers();
$this->assertTrue($mustache->hasHelper('foo'));
$this->assertTrue($mustache->hasHelper('bar'));
$this->assertTrue($helpers->has('foo'));
$this->assertTrue($helpers->has('bar'));
$this->assertSame($foo, $mustache->getHelper('foo'));
$this->assertSame($bar, $mustache->getHelper('bar'));
$mustache->removeHelper('bar');
$this->assertFalse($mustache->hasHelper('bar'));
$mustache->addHelper('bar', $bar);
$this->assertSame($bar, $mustache->getHelper('bar'));
$baz = array($this, 'wrapWithUnderscores');
$this->assertFalse($mustache->hasHelper('baz'));
$this->assertFalse($helpers->has('baz'));
$mustache->addHelper('baz', $baz);
$this->assertTrue($mustache->hasHelper('baz'));
$this->assertTrue($helpers->has('baz'));
// ... and a functional test
$tpl = $mustache->loadTemplate('{{foo}} - {{bar}} - {{#baz}}qux{{/baz}}');
$this->assertEquals('foo - BAR - __qux__', $tpl->render());
$this->assertEquals('foo - BAR - __qux__', $tpl->render(array('qux' => "won't mess things up")));
}