"relentless testing" is correct and usable in written English.
You can use it whenever you want to indicate that something is being tested without interruption. For example, "The engineers put the car through relentless testing before it was approved for production."
Various aerodynamic funnels and warps, the result of relentless testing in Honda's F1 wind tunnel in Sakura, mean handling is precise and sticky.
Critics of achievement testing contend that Potomac and similar scandals suggest that basic education is being subsumed by a process of relentless testing and ranking of schools based on material values that veer far from scholarship.
And the pattern of relentless testing continues in secondary school, with external exams at 14, 16, 17 and 18.The common theme across the age range, says Alan Smithers, an educationalist at Buckingham University, is the multiple uses to which the government wants to put exams.
The faulty designs gave rise to Gore's tough standards and relentless testing.
For those who are not familiar with Eric Ries' seminal tome, The Lean Startup, modern entrepreneurs have embraced the concept of rapid prototyping and relentless testing of business models before pursuing them.
"Today, unlike when they started as X projects, Loon and Wing seem a long way from crazy — and thanks to their years of hard work and relentless testing in the real world, they're now graduating from X to become two new independent businesses within Alphabet: Loon and wing," Teller wrote in the post.
The joy of archaeology is that it licenses wild conjecture by subjecting it to the relentless test of science.
For those of us who believe in a more just and equal world, reality is a relentless test of our optimism.
Whistling Straits, a long and relentless test on the shore of Lake Michigan, is not the place to recover from an 18-over-par tournament.
Recently a talented 10-year-old on a three-month trial at a Premier League academy spent the entire experience trying to cope with a relentless test of his character.
Most engage in relentless test prep, sometimes using the same questions that have appeared in the past and may well appear again on the state tests.
