Oh, really? And it's "testable" over tens of thousands of years. . . how? Fruit flies? And why only primates? Why haven't alligators evolved into something else? They've been on earth a lot longer than mammals.
Personally, I follow the Ancient Aliens theory of the creation of mankind.
Then, where did the mammals come from? Paleontology does give us fossils of reptiles that look a lot like primitive mammals. The process is incremental and takes small changes over generations. Even the so called Cambrian explosion during which many new species are found in the fossil record took more than 20 million years.
If you want a lesson in how evolution works, talk to the infection control folks at your local hospital :-)