The phrase "a landmark test of" is correct and usable in written English.
It can be used to describe a significant or pivotal examination or evaluation of something, often in a scientific or legal context.
Example: "The study was hailed as a landmark test of the new drug's effectiveness in treating the disease."
Alternatives: "a pivotal assessment of" or "a significant evaluation of".
Civil libertarians say the case poses a landmark test of what is allowed under the USA Patriot Act.
DURING the trial, you could hear the rumbling organ tones: this was a landmark test of women's rights.
Civil libertarians say the case poses a landmark test of what people can do or whom they can associate with in the age of terror alerts.
South Africa's former top policeman has been found guilty of corruption in a case seen as a landmark test of courts' independence in the democratic era.
The day was a milestone in the four-year-old case, often described as a landmark test of whether the antitrust laws of an industrial era can effectively protect competition in the fast-mutating world of high technology.
A landmark test of the system was conducted on Oct. 12 at the Observatory of Haute-Provence in southern France, using a relatively small telescope 5 feet in diameter under poor observing conditions.
A robot named Nico could soon pass a landmark test - recognising itself in a mirror.
During the nineteen-forties, in a series of landmark tests conducted around the country, the psychologists Kenneth and Mamie Clark demonstrated that black children associated virtue and intelligence with whiteness, and had correspondingly internalized racist stereotypes of inferiority.
In Australia and elsewhere, the Rio-Chinalco deal has been viewed as a corporate landmark, a crucial test of whether the West's shareholder-driven capitalism could mesh with a Chinese model that is ultimately under state control.
For the landmark test, the time spent swimming in a 30-cm diameter search zone, with its center directly below the center of the landmark, was recorded.
