"To test the consistency" means to check if something is reliable, dependable, or the same throughout. It involves verifying if something stays the same or matches a certain standard over time or across different situations. Full definition
Test the consistency by trying to form into a ball, about 1/2 the size of a baseball. (oneingredientchef.com)
[36] Brown R L, Durbin J, Evans J M. Techniques for testing the consistency of regression relations over time. (mpra.ub.uni-muenchen.de)
To test robustness of findings, they: (1) account for one - way trading frictions ranging from 0.02 % to 0.05 % across assets; (2) consider five subperiods to test consistency over time; and, (3) perform out - of - sample tests using the first part of each subperiod to select the best rules and roughly the last year to measure performance of these rules out - of - sample. (cxoadvisory.com)