@Test
public void Should_throwWhenSessionIsNotPresent()
        throws Exception {

    DebuggerActor actor = new DebuggerActor();
    when(commandMessageMock.getCommand()).thenReturn("closeSession");
    when(commandMessageMock.getCommandArguments()).thenReturn("non-exist");
    actor.executeCommand(commandMessageMock);
    verify(commandMessageMock).setException(any());
}