Document tests depending on `manifest.json` (#3120)
Document tests depending on `manifest.json` (#3120)

* Use Sphinx and rst markup

* Document current 'make tests' behavior

Workaround for #1536.

dstufft/warehouse,pypa/warehouse,pypa/warehouse,dstufft/warehouse,dstufft/warehouse,pypa/warehouse,dstufft/warehouse,pypa/warehouse