According to [this aviation.se question](https://aviation.stackexchange.com/questions/46965/what-physical-tests-are-involved-with-verifying-a-wing-spar-is-suitably-construc), wing load tests are done by placing weights on the wings (upside down). 

[![Wingload test](https://i.stack.imgur.com/aIcO3.jpg)](https://i.stack.imgur.com/aIcO3.jpg)

This unfortunately only tests the wings bending loads (for cantilever wings) and the wing struts (for semi cantilevers) but not the torsional strength of the wings. 

**How do I load test a wing such that its torsional capacity is also tested?**