This increase in testing is going on in basically every county in California.
The news paper articles are playing up the increase in people with the virus versus the decrease in % of people with the disease as shown by the CDC chart below:
https://img.theepochtimes.com/assets/uploads/2020/06/16/CDC-testing-versus-positive.jpg
Where people are worrying about “spikes” they should watch hospitalizations and deaths, not new cases.