Unit tests documentation does not specify non-python requirements

[Daniel Patrick]

Could not see the requirement (libmemcached-dev on my system) mentioned anywhere (although I most definitely could have missed it) but I think it would have helped me a little if it was mentioned in ​https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#running-the-unit-tests

[Will Johnson]

I ran in to this same error when installing the requirements on a fresh system. However, the paragraphs below the "Quickstart" commands tell you that to run all the tests, you will need the requirements installed. One of these being "memcached, plus a supported Python binding".

[Tim Graham]

This idea has been raised before and we addressed it with this addition:

Installing the requirements will likely require some operating system packages that your computer doesn’t have installed. You can usually figure out which package to install by doing a Web search for the last line or so of the error message. Try adding your operating system to the search query if needed.

I'd rather use that approach and/or have developers consult the documentation for each Python package rather than redocument the requirements in Django's docs.

[Daniel Patrick]

Noted - I should've read more clearly. I guess the fact that the comment regarding requirements comes after rather than before the instructions for installation and running seems a bit odd, though. Thanks.