add pypy3.5 to our test matrix (#3709)

* add pypy3.5 to our test matrix

* pypy-nocoverage time

.travis.yml

@@ -33,6 +33,7 @@ matrix:
           env: TOXENV=py36
         - env: TOXENV=pypy PYPY_VERSION=pypy2-5.3
         - env: TOXENV=pypy PYPY_VERSION=pypy2.7-5.8.0
+        - env: TOXENV=pypy-nocoverage PYPY_VERSION=pypy3.5-5.8.0
         - python: 2.7
           env: TOXENV=py27 OPENSSL=1.1.0f
         - python: 3.5
@@ -72,7 +73,7 @@ matrix:
         - language: generic
           os: osx
           osx_image: xcode8.3
-          env: TOXENV=pypy CRYPTOGRAPHY_SUPPRESS_LINK_FLAGS=1 PYPY_VERSION=pypy2.7-5.8.0
+          env: TOXENV=pypy-nocoverage CRYPTOGRAPHY_SUPPRESS_LINK_FLAGS=1 PYPY_VERSION=pypy2.7-5.8.0
         - language: generic
           os: osx
           osx_image: xcode8.3

tox.ini

@@ -18,6 +18,14 @@ commands =
     coverage combine
     coverage report -m
 
+# This target disables coverage on pypy because of performance problems with
+# coverage.py on pypy.
+[testenv:pypy-nocoverage]
+basepython = pypy
+commands =
+    pip list
+    pytest --capture=no --strict {posargs}
+
 [testenv:docs]
 extras =
     docstest