- another approach at coverage

tox.ini

@@ -1,57 +1,51 @@
 
 [tox]
-envlist = py{26,27,34,35}-{cext,nocext}-{default,sqlitepg,mysql,oracle,mssql}
+envlist =
+  py{26,27,34,35}-{cext,nocext}-{default,sqlitepg,mysql,oracle,mssql},
+  py27-nocext-cov,
+  py27-cext-cov,
+  py35-nocext-cov
 
 [testenv]
+cov_args=--cov=sqlalchemy --cov-report term --cov-report xml --exclude-tag memory-intensive --exclude-tag timing-intensive -k "not aaa_profiling"
+
 deps=pytest
      pytest-xdist
      mock
-     {sqlitepg}: .[postgresql]
-     {mysql}: .[mysql]
-     {mysql}: .[pymysql]
-     {oracle}: .[oracle]
-     {mssql}: .[pyodbc]
-     {mssql}: .[pymssql]
+     sqlitepg: .[postgresql]
+     mysql: .[mysql]
+     mysql: .[pymysql]
+     oracle: .[oracle]
+     mssql: .[pyodbc]
+     mssql: .[pymssql]
+     cov: pytest-cov
+     cov: .[mysql]
+     cov: .[postgresql]
 
 # -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
+# BASECOMMAND: we can't do section subtitutions in commands
+# (see https://bitbucket.org/hpk42/tox/issues/307/)
 setenv=
     PYTHONPATH=
     PYTHONNOUSERSITE=1
     nocext: DISABLE_SQLALCHEMY_CEXT=1
-
+    BASECOMMAND=python -m pytest -n4 --dropfirst
+    cov: BASECOMMAND=python -m pytest -n4 --dropfirst {[testenv]cov_args}
 
 # tox as of 2.0 blocks all environment variables from the
 # outside, unless they are here (or in TOX_TESTENV_PASSENV,
 # wildcards OK).  Need at least these
 passenv=ORACLE_HOME NLS_LANG
 
-
 commands=
-  {default}: python -m pytest -n4 --dropfirst {posargs}
-  {sqlitepg}: python -m pytest -n4 --dropfirst --db sqlite --db postgresql {posargs}
-  {mysql}: python -m pytest -n4 --dropfirst --db mysql --db pymysql {posargs}
-  {oracle}: python -m pytest -n4 --dropfirst --db oracle {posargs}
-  {mssql}: python -m pytest -n4 --dropfirst --db pyodbc --db pymssql {posargs}
-
-
-[testenv:coverage]
-setenv=
-  DISABLE_SQLALCHEMY_CEXT=1
-
-# see also .coveragerc
-deps=pytest-cov
-     pytest-xdist
-     coverage
-     mock
-commands=
-  python -m pytest -n4 --cov=sqlalchemy --cov-report term --cov-report xml \
-    --exclude-tag memory-intensive \
-    --exclude-tag timing-intensive \
-    -k "not aaa_profiling" \
-    {posargs}
-
+  default: {env:BASECOMMAND} {posargs}
+  sqlitepg: {env:BASECOMMAND} --db sqlite --db postgresql {posargs}
+  mysql: {env:BASECOMMAND} --db mysql --db pymysql {posargs}
+  oracle: {env:BASECOMMAND} --db oracle {posargs}
+  mssql: {env:BASECOMMAND} --db pyodbc --db pymssql {posargs}
+  cov: {env:BASECOMMAND} --db sqlite --db postgresql --db mysql {posargs}
 
 [testenv:pep8]
 deps=flake8