diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -1,29 +1,20 @@
 [tox]
 envlist=flake8,mypy,py3-{core,db,server}
 
-[testenv:py3-core]
+[testenv]
 deps =
   -rrequirements-test.txt
-  -rrequirements-logging.txt
-  .
+  core: -rrequirements-logging.txt
+  db: .[db]
+  db: pifpaf
+  server: .[http]
 commands =
-  pytest --doctest-modules {envsitepackagesdir}/swh/core/tests {posargs}
-
-[testenv:py3-db]
-deps =
-  -rrequirements-test.txt
-  .[db]
-  pifpaf
-commands =
-  pifpaf run postgresql -- \
-    pytest {envsitepackagesdir}/swh/core/db/tests {posargs}
-
-[testenv:py3-server]
-deps =
-  -rrequirements-test.txt
-  .[http]
-commands =
-  pytest {envsitepackagesdir}/swh/core/api/tests {posargs}
+  db: pifpaf run postgresql -- \
+    pytest --doctest-modules \
+  core: {envsitepackagesdir}/swh/core/tests \
+  db: {envsitepackagesdir}/swh/core/db/tests \
+  server: {envsitepackagesdir}/swh/core/api/tests \
+    {posargs}
 
 [testenv:py3]
 deps =