How the test runner find test cases for package?

I write a package and add the 'Tests' folder write some test code. In a unity project, I import this package as a local package. I write this text in the manifest.json: `"my.package": "file:../../MyPackage"`
In the unity project, I can not find any test in test runner. Is there any way to run the tests inside the package?

 

OK, I find that I need add 'testables' into my manifest.

 

Can you show an example of a valid
"testables" entry?

im trying to load a lcoal package and no mater what i put in my unit tests are not showing in the test runner