public function testHasSurrogateEsiCapability() {
$esi = new Esi();
$request = Request::create('/');
$request->headers
->set('Surrogate-Capability', 'abc="ESI/1.0"');
$this
->assertTrue($esi
->hasSurrogateEsiCapability($request));
$request = Request::create('/');
$request->headers
->set('Surrogate-Capability', 'foobar');
$this
->assertFalse($esi
->hasSurrogateEsiCapability($request));
$request = Request::create('/');
$this
->assertFalse($esi
->hasSurrogateEsiCapability($request));
}