Assert.assertTrue(fdm.getDeployers().contains(deployer2));
Assert.assertTrue(fdm.getDeployers().contains(deployer3));
Assert.assertTrue(fdm.getDeployers().contains(deployer4));
Assert.assertEquals(3, fdm.getDeployed().size());
fdm.unregisterDeployer(deployer2);
fdm.unregisterDeployer(deployer3);
Assert.assertEquals(1, fdm.getDeployers().size());
Assert.assertTrue(fdm.getDeployers().contains(deployer4));
Assert.assertEquals(1, fdm.getDeployed().size());