How exactly can evolution be tested?
There are such markers on all humans' genomes. The same marker is on the exact same link of the genome of the chimpanzee proving that an ancestor common to both got the virus and passed on the change to all of its descendants; human and chimp.
There are many such examples. Coincidence is on the order of billions to one against.
Evolution has BEEN tested, repeatedly, and has failed every test.
The most spectacular of such were the tests involving fruit flies in the early decades of the last century.Fruit flies breed new generations every other DAY, so that running tests on fruit flies for two or three decades will amount to more generations of fruit flies than there ever have been of anything remotely resembling humans on this planet.
They subjected those flies to everything in the world known to cause mutations and recombined mutants every possible way. All they ever got was sterile freaks and fruit flies. No wasps, hornets, butterflies, caterpillars, bees, ants, spiders, or anything else, just fruit flies. Several prominent scientists publicly denounced evolution as a bunch of BULLSHIT as a result of those tests including the famous case of Richard Goldschmidt who claimed afterward to be being subjected to something akin to Orwell's two minute hate seances of 1984 by colleagues.
The reason they never got anything but fruit flies is that our entire living world is driven by information, and the only information they ever had was that for a fruit fly. When the information code of RNA/DNA became known in the mid 1960s, the mystery was basically resolved. There has never been a valid reason for anybody with any semblance of brains or talent believing in evolution since that time.