Fix #328, TestAgentHandle fails randomly

[haoyu234]

I suspect go ag.Handle() executes so early that some EXPECT() calls are missed (line 1022), maybe we should put it after all EXPECT() calls.

[coveralls]

Pull Request Test Coverage Report for Build 5829953166

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 62.238%

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Totals
Change from base Build 5658434483:	0.0%
Covered Lines:	4783
Relevant Lines:	7685

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💛 - Coveralls