- Fixed the pathing used when tests run; for sqla_nose.py and py.test,

the "./lib" prefix is again inserted at the head of sys.path but
only if sys.flags.no_user_site isn't set; this makes it act just
like the way Python puts "." in the current path by default.
For tox, we are setting the PYTHONNOUSERSITE flag now.
fixes #3356

doc/build/changelog/changelog_10.rst

@@ -18,6 +18,16 @@
 .. changelog::
     :version: 1.0.0
 
+    .. change::
+        :tags: bug, tests
+        :tickets: 3356
+
+        Fixed the pathing used when tests run; for sqla_nose.py and py.test,
+        the "./lib" prefix is again inserted at the head of sys.path but
+        only if sys.flags.no_user_site isn't set; this makes it act just
+        like the way Python puts "." in the current path by default.
+        For tox, we are setting the PYTHONNOUSERSITE flag now.
+
     .. change::
         :tags: feature, sql
         :tickets: 3084

regen_callcounts.tox.ini

@@ -12,8 +12,6 @@ deps=pytest
 	 py{27}-sqla_{cext,nocext}-db_{mysql}: mysql-python
 	 py{33,34}-sqla_{cext,nocext}-db_{mysql}: pymysql
 
-usedevelop=False
-sitepackages=True
 
 
 commands=
@@ -22,7 +20,11 @@ commands=
 	db_{postgresql}: {[base]basecommand} --db postgresql {posargs}
 	db_{sqlite}: {[base]basecommand} --db sqlite {posargs}
 
+# -E     : ignore PYTHON* environment variables (such as PYTHONPATH)
+# -s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
 setenv=
-	sqla_nocext: DISABLE_SQLALCHEMY_CEXT=1
+    PYTHONPATH=
+    PYTHONNOUSERSITE=1
+    sqla_nocext: DISABLE_SQLALCHEMY_CEXT=1
 
 

sqla_nose.py

@@ -10,10 +10,11 @@
 import nose
 import os
 
-
-for pth in ['./lib']:
-    sys.path.append(
-        os.path.join(os.path.dirname(os.path.abspath(__file__)), pth))
+if not sys.flags.no_user_site:
+    sys.path.insert(
+        0,
+        os.path.join(os.path.dirname(os.path.abspath(__file__)), 'lib')
+    )
 
 # use bootstrapping so that test plugins are loaded
 # without touching the main library before coverage starts

test/conftest.py

@@ -9,10 +9,12 @@
 import sys
 import os
 
-for pth in ['../lib']:
-    sys.path.append(
-        os.path.join(os.path.dirname(os.path.abspath(__file__)), pth))
-
+if not sys.flags.no_user_site:
+    sys.path.insert(
+        0,
+        os.path.join(
+            os.path.dirname(os.path.abspath(__file__)), '..', 'lib')
+    )
 
 # use bootstrapping so that test plugins are loaded
 # without touching the main library before coverage starts

tox.ini

@@ -5,8 +5,22 @@ envlist = full,py26,py27,py33,py34
 deps=pytest
      mock
 
-sitepackages=True
-usedevelop=True
+# -E     : ignore PYTHON* environment variables (such as PYTHONPATH)
+# -s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
+# the latter is picked up by conftest.py
+setenv=
+    PYTHONPATH=
+    PYTHONNOUSERSITE=1
+
+# don't accidentally use a SQLAlchemy that's globally installed during pip;
+# unfortunately, without usedevelop, no easy way to use systemwide
+# site-packages for dependencies
+sitepackages=False
+
+# always install fully and use that; this way options like
+# DISABLE_SQLALCHEMY_CEXT are honored
+usedevelop=False
+
 
 commands=
   python -m pytest {posargs}