public function testGetSetExecutors()
 {
     $executor = new Executor();
     $name = $executor->getName();
     $this->assertFalse($this->manager->hasExecutor($name));
     $this->manager->addExecutor($executor);
     $this->assertTrue($this->manager->hasExecutor($name));
     $this->assertSame($executor, $this->manager->getExecutor($name));
     $this->assertEquals([$name => $executor], $this->manager->getExecutors());
 }