"simply testing" is correct and usable in written English.
Example: I had spent hours trying to figure out the problem, but it turned out that the solution was simply testing the equipment to make sure it was plugged in properly.
For now, the astronauts are simply testing the hardware rather than creating wholesome space salads.
Mr. Walsh said that rather than simply testing a forbidden world, some adults might simply be inhabiting it.
She's simply testing Thomas's "maleness" — that is, his desire to be counted on, to be admired, to be "Daddy".
An estimate of the value, however, can be obtained by simply testing how heavy a specimen feels.
Timbaland tried each idea for a few minutes and then dialed up a new sound as if he was distracted, or simply testing his gear.
He had no instructions from the alleged pirates as to their defence to the charges and was simply testing the prosecution case".
The first phase of the trial will simply test the vaccine for safety, using healthy volunteers in the United States and South Africa.
But where other apps simply test your new language skills on preset examples, Duolingo takes another approach.
One of the odd effects of steroids on a baseball player is that they help him to improve most the skills that can be most simply tested.
If anybody had contested the overvotes, it would have been a relatively simple process to test that because you could have simply tested as to whether the double vote was a write-in vote or was another candidate.
"You don't have a situation where you can simply test the drug in a population that has the problem," said Dr. Jane E. Henney, who was commissioner of the Food and Drug Administration until January.
