The phrase "a more serious test" is correct and usable in written English.
It can be used when comparing the severity or difficulty of different tests or assessments.
Example: "After passing the initial evaluation, students will face a more serious test to determine their readiness for the next level."
Alternatives: "a tougher exam" or "a more challenging assessment".
A more serious test is now being carried out by Arizona Public Service, that state's power utility, at its Redhawk plant.
The idea had an early field test on Obama's 2006 trip to Africa, and a more serious test last summer, when he and an entourage that included most of his principal foreign-policy aides toured the Middle East and Europe.
PARIS, Feb. 1 - The delicate relationship between the United States and France has withstood freedom fries and frosty friendship, but now it may be facing a more serious test: disappearing French tourists.
In this tough environment Sime Darby faces a more serious test than most of its rivals.
But a more serious test would come over US or Japanese surveillance flights through the ADIZ, or when Japan sends fighters into the airspace over the islands.
But it was the annual series of DARPA Challenges--races for autonomous vehicles that were first held in the California desert and later moved to urban environments--that offered a more serious test for his ingenuity.
If 60 players out of 1,183 on major league rosters test positive, a more serious testing program will go into effect next year, and the White Sox players hoped to trigger that testing.
Though the government won this vote, it faces an even more serious test in November, when Parliament will be asked to approve continuing participation in the United States' effort to curb terrorism.
There could be no starker or more serious test of the bishop's call for cultural change than Sir Martin Moore-Bick's inquiry.
"We stand behind our union, and they're behind the players," Zito said today of the abortive move to refuse testing, which was an attempt to force more serious testing next year.
Fiction for young people had been moving that way for years… getting older, getting more serious, testing the waters.
