"impending test" is a correct and usable phrase in written English.
You could use it to refer to an upcoming test, such as an upcoming exam or quiz. For example, "I'm feeling the pressure of the impending test."
Jackie herself has a lump in the breast and struggles with fear of the impending test results.
"It's something I feel like I'm ready for," Moeen said of his impending Test debut, having played three one-day internationals and six Twenty20s during the winter.
Adding to the sense of an impending test, Reuters reported from China quoting a "source with close ties to Pyongyang and Beijing" as saying "preparations are almost complete" for a test in the near future.
I felt deeply tired, from the stress of the impending test and work at the shop and maybe the new allergy medicine my mother had prescribed for me earlier that week.
The timing of Ireland's impending Test arrival brings with it a slight tinge of frustration, given the captain, William Porterfield, the O'Brien brothers, Boyd Rankin (absent this week through injury) and Ed Joyce – their greatest run‑scorer – are into their 30s.
Earlier this week Gilroy signed a contract extension with Ulster until 2016 and on Thursday he was celebrating his impending Test baptism.
Benjamin and Janie join the band's dangerous mission to the Arctic to stop an impending Russian test masterminded by a young physicist named Andrei Sakharov.
Boogaard's father, Len, also told The Times that when Boogaard, who had gone through rehabilitation for substance abuse, was with the Rangers, he knew about an impending drug test four days before it was administered.
Asked about stock buybacks, he said that while the bank planned some buybacks in the future, it would wait for the results of an impending stress test before announcing how much stock it was buying.
South Korean officials said Monday that no signs of an impending nuclear test had been detected.
China ordered 2,000 troops to secure its North Korean border last week after receiving word about a possible impending nuclear test.
