The phrase "a clear test for" is correct and usable in written English.
It can be used when describing a specific method or criterion used to evaluate or measure something.
Example: "The researchers developed a clear test for determining the effectiveness of the new drug."
Alternatives: "a definitive measure for" or "an unambiguous assessment for".
In 2012, Nevada offers a clear test case for the economic debates and changing demographics that will determine this election.
Although the Supreme Court of the United States has never developed a single clear test for determining what kinds of state action violate the Establishment Clause of the First Amendment, schools that attempt to teach or introduce intelligent design as a purportedly scientific alternative to evolution likely fall afoul of the First Amendment's commands.
Presently, because the activating signal of the Hpo pathway is unknown, and because no positive targets of the pathway have been described, there is no clear test for the presence of a possible gradient of Hpo activity among the follicle cells.
Current regulations provide no clear test for what constitutes election activity or for how much of their revenue tax-exempt groups can spend to try to influence elections.
There is no clear test for when evidence rises to the level of being "exculpatory," thereby requiring the government to disclose it to the defense.
Like so many disorders, there is no one clear test for selective mutism, or "SM" as it's sometimes called, and parents like Alvin and Krystal often spend years hunting for answers and help for their children.
Statistical comparisons of host and HEG data allowed us clear tests for differences in evolutionary histories.
More recent reports using the FDA cleared test for serum samples found a higher percentage of patients with elevated HER-2/neu levels.
The other justices on the right said they did not see a way to create a clear, legal test for deciding when ordinary politics goes too far and becomes unconstitutional.
May must recognize that the million-strong march is a clearer litmus test for what the country thinks than the select few who visited her on Sunday.
