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Rollup merge of #38013 - wezm:simplify-test-notes, r=steveklabnik

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Simplify notes on testing and concurrency

The start of the notes on tests running concurrently, added in https://github.com/rust-lang/rust/pull/37766 read a little awkwardly. This PR fixes that and simplifies the wording a bit.

r? @steveklabnik
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Steve Klabnik 2016-12-24 14:29:20 -05:00 • committed by GitHub
commit 685027a23e
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9
src/doc/book/testing.md
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@ -589,11 +589,10 @@ please see the [Documentation chapter](documentation.html).
# Testing and concurrency
One thing that is important to note when writing tests is that they may be run
concurrently using threads. For this reason you should take care that your tests
are written in such a way as to not depend on each-other, or on any shared
state. "Shared state" can also include the environment, such as the current
working directory, or environment variables.
It is important to note that tests are run concurrently using threads. For this
reason, care should be taken to ensure your tests do not depend on each-other,
or on any shared state. "Shared state" can also include the environment, such
as the current working directory, or environment variables.
If this is an issue it is possible to control this concurrency, either by
setting the environment variable `RUST_TEST_THREADS`, or by passing the argument