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Added a caution note about UploadedFile and insulated tests #8180

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Jul 21, 2017
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Added a caution note about UploadedFile and insulated tests #8180

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8 changes: 8 additions & 0 deletions testing/insulating_clients.rst
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Expand Up @@ -43,3 +43,11 @@ clean PHP process, thus avoiding any side-effects.

As an insulated client is slower, you can keep one client in the main
process, and insulate the other ones.

.. caution::

Insulating tests requires some serializing and unserializing operations. If
your test includes data that can't be serialized, such as file streams when
using the ``UploadedFile`` class, you'll see an exception about
*"serialization is not allowed"*. This is a technical limitation of PHP, so
the only solution is to disable insulation for those tests.