Use pinned dependencies for asyncio and PyPy tests against oldest supported Python versions

.travis.yml

@@ -20,9 +20,9 @@ matrix:
 
     - env: TOXENV=pinned
       python: 3.5.2
-    - env: TOXENV=asyncio
+    - env: TOXENV=asyncio-pinned
       python: 3.5.2  # We use additional code to support 3.5.3 and earlier
-    - env: TOXENV=pypy3 PYPY_VERSION=3-v5.9.0
+    - env: TOXENV=pypy3-pinned PYPY_VERSION=3-v5.9.0
 
     - env: TOXENV=py
       python: 3.5

tox.ini

@@ -58,13 +58,7 @@ deps =
 commands =
     pylint conftest.py docs extras scrapy setup.py tests
 
-[testenv:pypy3]
-basepython = pypy3
-commands =
-    py.test {posargs:--durations=10 docs scrapy tests}
-
 [testenv:pinned]
-basepython = python3
 deps =
     -ctests/constraints.txt
     cryptography==2.0
@@ -91,6 +85,24 @@ deps =
     reppy
     robotexclusionrulesparser
 
+[testenv:asyncio]
+commands =
+    {[testenv]commands} --reactor=asyncio
+
+[testenv:asyncio-pinned]
+commands = {[testenv:asyncio]commands}
+deps = {[testenv:pinned]deps}
+
+[testenv:pypy3]
+basepython = pypy3
+commands =
+    py.test {posargs:--durations=10 docs scrapy tests}
+
+[testenv:pypy3-pinned]
+basepython = {[testenv:pypy3]basepython}
+commands = {[testenv:pypy3]commands}
+deps = {[testenv:pinned]deps}
+
 [docs]
 changedir = docs
 deps =
@@ -122,7 +134,3 @@ deps = {[docs]deps}
 setenv = {[docs]setenv}
 commands =
     sphinx-build -W -b linkcheck . {envtmpdir}/linkcheck
-
-[testenv:asyncio]
-commands =
-    {[testenv]commands} --reactor=asyncio