getImpersonatorUser example

class SecurityDataCollectorTest extends TestCase
{
    public function testCollectWhenSecurityIsDisabled()
    {
        $collector = new SecurityDataCollector(null, null, null, null, null, null, true);
        $collector->collect(new Request(), new Response());

        $this->assertSame('security', $collector->getName());
        $this->assertFalse($collector->isEnabled());
        $this->assertFalse($collector->isAuthenticated());
        $this->assertFalse($collector->isImpersonated());
        $this->assertNull($collector->getImpersonatorUser());
        $this->assertNull($collector->getImpersonationExitPath());
        $this->assertNull($collector->getTokenClass());
        $this->assertFalse($collector->supportsRoleHierarchy());
        $this->assertCount(0, $collector->getRoles());
        $this->assertCount(0, $collector->getInheritedRoles());
        $this->assertEmpty($collector->getUser());
        $this->assertNull($collector->getFirewall());
    }

    public function testCollectWhenAuthenticationTokenIsNull()
    {