Analysis of apsidal motion in eclipsing binaries using TESS data - I. A test of gravitational theoriesD. Baroch, A. Giménez, I. Ribas, J. C. Morales, G. Anglada-Escudé and A. ClaretA&A, 649 (2021) A64DOI: https://doi.org/10.1051/0004-6361/202040004