### Test entries

Tests can now be colocated in arbitrary directories

**Before**

Only root is supported
- `src/test/browser/index.js`
- `src/test/browser/index.js`

**After**

Root
- `src/__tests__/foo.node.js` (node only)
- `src/__tests__/bar.browser.js` (browser only)
- `src/__tests__/qux.js` (universal)

Nested
- `src/subdir/__tests__/foo.node.js` (node only)
- `src/subdir/__tests__/bar.browser.js` (browser only)
- `src/subdir/__tests__/qux.js` (universal)