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Minor fix to testing concurrency section #38112

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Dec 4, 2016
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Minor fix to testing concurrency section #38112

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10 changes: 5 additions & 5 deletions src/doc/book/testing.md
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Expand Up @@ -589,11 +589,11 @@ please see the [Documentation chapter](documentation.html).

# Testing and concurrency

One thing that is important to note when writing tests are 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.
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.

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
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