private Set<AgentInfo> getRecentlyUsedAgents() {
		Set<AgentInfo> cachedAgents = newHashSet();
		cachedAgents.add(createAgentInfo("test-agent-1", "test-region"));
		cachedAgents.add(createAgentInfo("test-agent-3", "test-region"));
		cachedAgents.add(createAgentInfo("test-agent-5", "test-region"));
		cachedAgents.add(createAgentInfo("test-agent-6", "test-region", TEST_USER_ID));
		return cachedAgents;
	}
Priority of agent selection.
1. dedicated agent of recently used.
2. dedicated agent.
3. public agent of recently used.
4. public agent.
ngrinder-controller/src/test/java/org/ngrinder/agent/service/AgentServiceTest.java