How to 'Test BACC "Thumper" Solid Fuel Booster in flight over Kerbin'?

After endless tries, how can it be achieved?

Req: 5Km~14Km, 100~800 m/sec

I created a craft with the device, achieved all test conditions (all is green), still I don't get the achievement. What did I miss?

kerbal-space-program

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