Enable cover tox env on Travis (googleapis#628)

Replace fragile app engine sdk download script with gcprepotools script -
this ensures the SDK is up-to-date and is a no-op if the SDK is installed
and up-to-date.

Resolves googleapis#617

Author: Jon Wayne Parrott

.travis.yml

@@ -21,6 +21,8 @@ matrix:
     env: TOX_ENV=system-tests
   - python: 3.4
     env: TOX_ENV=system-tests3
+  - python: 2.7
+    env: TOX_ENV=cover
 env:
   global:
   - GAE_PYTHONPATH=${HOME}/.cache/google_appengine
@@ -33,7 +35,7 @@ install:
 script:
 - ./scripts/run.sh
 after_success:
-- if [[ "${TOX_ENV}" == "gae" ]]; then tox -e coveralls; fi
+- if [[ "${TOX_ENV}" == "cover" ]]; then coveralls; fi
 notifications:
   email: false
 

scripts/fetch_gae_sdk.py

@@ -16,11 +16,12 @@
 
 set -ev
 
-pip install tox
+pip install --upgrade pip setuptools tox coveralls
 
 # App Engine tests require the App Engine SDK.
-if [[ "${TOX_ENV}" == "gae" && ! -d ${GAE_PYTHONPATH} ]]; then
-    python scripts/fetch_gae_sdk.py `dirname ${GAE_PYTHONPATH}`
+if [[ "${TOX_ENV}" == "gae" || "${TOX_ENV}" == "cover" ]]; then
+    pip install git+https://github.com/GoogleCloudPlatform/python-repo-tools.git
+    gcprepotools download-appengine-sdk `dirname ${GAE_PYTHONPATH}`
 fi
 
 # Travis ships with an old version of PyPy, so install at least version 2.6.

scripts/install.sh

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,pypy,gae,cover
+envlist = flake8,py27,py34,py35,pypy,gae,cover
 
 [testenv]
 basedeps = mock>=1.3.0
@@ -31,7 +31,7 @@ commands =
       --cov=oauth2client \
       --cov=tests \
       --cov-append \
-       --gae-sdk={env:GAE_PYTHONPATH} \
+       --gae-sdk={env:GAE_PYTHONPATH:} \
       tests/contrib/appengine
 deps = {[testenv]deps}
     coverage
@@ -45,17 +45,6 @@ commands =
 deps =
     {[coverbase]deps}
 
-[testenv:coveralls]
-basepython = {[coverbase]basepython}
-commands =
-    {[coverbase]commands}
-    coverage report --show-missing
-    coveralls
-deps =
-    {[coverbase]deps}
-    coveralls
-passenv = {[testenv:system-tests]passenv}
-
 [testenv:docs]
 basepython = python2.7
 deps =
@@ -71,7 +60,7 @@ commands = {toxinidir}/scripts/build_docs.sh
 basepython = python2.7
 deps = {[testenv]basedeps}
 commands =
-    py.test --gae-sdk={env:GAE_PYTHONPATH} tests/contrib/appengine
+    py.test --gae-sdk={env:GAE_PYTHONPATH:} tests/contrib/appengine
 
 [testenv:system-tests]
 basepython =
@@ -111,7 +100,7 @@ deps =
     flake8-import-order
 
 [flake8]
-exclude = .tox,.git,./*.egg,build,
+exclude = .tox,.git,./*.egg,build,.cache,env,__pycache__
 application-import-names = oauth2client, tests
 putty-ignore =
   # E402 module level import not at top of file