"test the assumption" is grammatically correct and is a usable phrase in written English.
You can use it when you are asking someone to critically assess a supposition or statement to see if the assumptions made are valid. For example, "Before developing our marketing plan, we should test the assumption that our target audience wants this product."
The Box's Test of Equality of Covariance Matrices was performed to test the assumption that the population under study had a multivariate normal distribution and equal variance-covariance matrices.
In the first we report on Chinese authorities' recent moves to test the assumption that the yuan, if allowed to float, might only move in one direction.
The study aimed to test the assumption that reduced sleep time in the modern world is linked to obesity, mood disorders and other mental and physical illnesses.
If Mr. Fox wins, his battles to govern with a legislature controlled by his adversaries may sorely test the assumption that change at the top is the soul of democracy.
The pair then built a web-based prototype, which is still live, to "test the assumption that users would have liked this UX for shopping purposes".
We test the assumption of optically thin plasma emission using the Fe xvil emission lines at 15.03 and 15.27 Å.
Subsequently, we test the assumption of IIA and the result confirms the suitability of multinomial logit model in the study.
So a team of researchers turned to Panzee, a 25-year-old chimpanzee, to test the assumption that only humans have this talent.
Allowable experiments, for instance, could test the assumption that an influenza virus infecting a small mammal such as a ferret could also infect a monkey.
The aim of the current study was to prospectively test the assumption that pain-related fear in acute stages successfully predicts future disability.
This is done to test the assumption, based on lithics, that the diatreme is limited to 250 m depth and identify the reasons behind LPM's large size.
