There have been assertions that increased case counts are all from increased testing. As you might expect, it’s not so clear cut. Andrew Witherspoon and Caitlin Owens for Axios show the changes in testing against changes in cases.
So in the wideout view of every state, the more-testing-more-cases assertion isn’t so straightforward.
ProPublica provided a similar comparison a couple of weeks ago, but I like the difference charts here for every state. They make the gaps more obvious.