### Question:
AAIUpdatorImpl implements AAIUpdator { @Override public void updateVnfToLocked(String vnfId) throws Exception { client.updateMaintenceFlagVnfId(vnfId, true); }  AAIRestClientI getClient(); void setClient(AAIRestClientI client); @Override void updateVnfToLocked(String vnfId); @Override void updateVnfToUnLocked(String vnfId);  }### Answer:
@Test(expected = NullPointerException.class) public void updateVnfToLockedTest() throws Exception { test.updateVnfToLocked("vnfId"); }