"The Latvian Bridge Test"

Meaning: Test case where failure of the test is potentially more harmful than not executing the test at all (thanks for Englishizing that, lo5an)

Source: Sep 20 1986 Officials in Latvia test the structural integrity of a 40-year-old bridge by driving 14 heavy vehicles containing gravel on top of it. A 250-foot span of the bridge collapses, killing ten people