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The part of the sentence "it has been testing" is correct and usable in written English.
You can use it when discussing something that has been difficult to do or understand. For example, "The new software has been testing our patience, but it is finally starting to work properly."
Exact(32)
It has been testing its vehicles on Frisco's roads since January sometimes without a driver behind the wheel.
It said it has been testing its autonomous systems for the past eight years, with more than 5 million miles logged on public roads.
The enterprise version of its service launches today, although it has been testing it with Reuters and AP for about six months.
The National Trust's preferred approach is vaccination and it has been testing badger vaccination at its own cost since 2011 on its Killerton Estate in Devon.
Today, Google responded with its own official launch of Google Instant previews, which it has been testing for months.
Next week, O2 will announce results of a trial of another rival technology it has been testing in Oxford.
Similar(28)
The EPA is standing by its proposed requirement, arguing it has been tested on several facilities.
It has been tested in two clinical trials that confirmed its safety in humans [28,47].
It has been tested in wind tunnels.
It has been tested with lammpi.
It has been tested extensively in studies of tethered bacteria.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com