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Fixed #19167 - Added a warning regarding module-level database queries

Thanks Daniele Procida for the patch.
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1 parent 082fad0 commit 07361d1fd6b4531e422e2593c91b47bc6bf88993 @timgraham timgraham committed
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  1. +9 −0 docs/topics/testing.txt
9 docs/topics/testing.txt
@@ -379,6 +379,15 @@ control the particular collation used by the test database. See the
:doc:`settings documentation </ref/settings>` for details of these
advanced settings.
+.. admonition:: Finding data from your production database when running tests?
+ If your code attempts to access the database when its modules are compiled,
+ this will occur *before* the test database is set up, with potentially
+ unexpected results. For example, if you have a database query in
+ module-level code and a real database exists, production data could pollute
+ your tests. *It is a bad idea to have such import-time database queries in
+ your code* anyway - rewrite your code so that it doesn't do this.
.. _topics-testing-masterslave:
Testing master/slave configurations

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