1 files changed, 31 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 80ac9324df..87b5e4782d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ envlist = packaging, py27, py36, pep8, check_isort
 [base]
 deps =
     coverage
-    Twisted>=15.1
+    Twisted>=17.1
     mock
     python-subunit
     junitxml
@@ -64,12 +64,42 @@ setenv =
     {[base]setenv}
     SYNAPSE_POSTGRES = 1
 
+# A test suite for the oldest supported versions of Python libraries, to catch
+# any uses of APIs not available in them.
+[testenv:py27-old]
+skip_install=True
+deps =
+    # Old automat version for Twisted
+    Automat == 0.3.0
+
+    mock
+    lxml
+commands =
+    /usr/bin/find "{toxinidir}" -name '*.pyc' -delete
+    # Make all greater-thans equals so we test the oldest version of our direct
+    # dependencies, but make the pyopenssl 17.0, which can work against an
+    # OpenSSL 1.1 compiled cryptography (as older ones don't compile on Travis).
+    /bin/sh -c 'python -m synapse.python_dependencies | sed -e "s/>=/==/g" -e "s/psycopg2==2.6//" -e "s/pyopenssl==16.0.0/pyopenssl==17.0.0/" | xargs pip install'
+    # Install Synapse itself. This won't update any libraries.
+    pip install -e .
+    {envbindir}/trial {env:TRIAL_FLAGS:} {posargs:tests} {env:TOXSUFFIX:}
+
 [testenv:py35]
 usedevelop=true
 
 [testenv:py36]
 usedevelop=true
 
+[testenv:py36-postgres]
+usedevelop=true
+deps =
+    {[base]deps}
+     psycopg2
+setenv =
+    {[base]setenv}
+    SYNAPSE_POSTGRES = 1
+
+
 [testenv:packaging]
 deps =
     check-manifest