Examples
““Bird?” he called testily, starting to shuffle away.”
“Sam blinked at his page, x-ed out one name testily, and put in the other.”
The Tiger in the Smoke
“Well, I know this," testily, "that I am not to be instructed as to the sort of person I can ask to my house.”
“Kim Howells, Labour foreign office minister, delivered a "stern message" to the Ghanaian government in October 2007 about its lack of co-operation and responded "testily" to a request from Ghana's interior minister for more scanning equipment, saying "if a 'criminal' is operating equipment, it is worthless,”
“Th 'owd Parson!" testily; "I ha 'no patience wi' him.”
“Th 'owd parson!" testily; "I ha 'no patience wi' him.”
“NEW ORLEANS -- The game, Nick Saban insisted rather testily the day before, was never about him.”
The Huffington Post: Nick Saban Leads Alabama To BCS Championship Over LSU
““What personal attacks?” he had asked testily, and not waiting for an answer demanded she identify “just one of my speeches or one of our ads that made a personal attack on Governor Morrison.””
“China responded swiftly and testily to the developments on Capitol Hill, arguing that the move would contravene WTO rules and quite deliberately tweaking its currency lower.”
The Guardian: Global recovery's weakness raises possibility of trade war
“Quit it, delete it, cease it," Chauncey Delarouse admonished testily.”
Lists
These user-created lists contain the word ‘testily’.
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Adverbia
A long list of adverbs, beginning with full-drive. Someone has to list them.
Read some sniping and some informative commentary about adverbs here.
Reesetee's list Conjunctive Adv...full-drive, portentously, unlawfully, legally, heterogeneously, consumingly, clancularly, inconsolably, prepositionally, retrogressively, symptomatically, decrepitly and 2243 more...

yarb I could not see what he did with the poles. I became irascible. I wanted to demand testily of him 'Account for your poles, sir!'
- Peter Reading, C, 1984 Aug 2, 2008