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5082: Document test minimality r=matklad a=matklad



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Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
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@ -166,6 +166,17 @@ That said, adding an innocent-looking `pub use` is a very simple way to break en
Note: if you enjoyed this abstract hand-waving about boundaries, you might appreciate
https://www.tedinski.com/2018/02/06/system-boundaries.html
## Minimal Tests
Most tests in rust-analyzer start with a snippet of Rust code.
This snippets should be minimal -- if you copy-paste a snippet of real code into the tests, make sure to remove everything which could be removed.
There are many benefits to this:
* less to read or to scroll past
* easier to understand what exactly is tested
* less stuff printed during printf-debugging
* less time to run test
## Order of Imports
We separate import groups with blank lines