Replace setup.py test with pytest command (google#380)

Replace `setup.py test` with pytest command

.travis.yml

@@ -39,10 +39,13 @@ matrix:
         - echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list
         - curl https://bazel.build/bazel-release.pub.gpg | sudo apt-key add -
         - sudo apt-get update && sudo apt-get install bazel make
+        - sudo apt install python3-dev
+        - pip install -U pytest --user
       script: make all
 
 before_install:
   - sudo apt install python3-dev
+  - pip install -U pytest --user
   - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
   - go get github.com/fatih/color

setup.py

@@ -16,6 +16,7 @@
 from setuptools import setup
 from setuptools import Extension
 from setuptools.command.build_ext import build_ext as BuildExt
+from setuptools.command.test import test as TestCommand
 from subprocess import Popen, PIPE
 
 DIR = os.path.abspath(os.path.dirname(__file__))
@@ -45,6 +46,10 @@ def run(self):
 
         BuildExt.run(self)
 
+class NoopTestCommand(TestCommand):
+    def __init__(self, dist):
+        print("_gojsonnet does not support running tests with 'python setup.py test'. Please run 'pytest'.")
+
 jsonnet_ext = Extension(
     '_gojsonnet',
     sources=MODULE_SOURCES,
@@ -63,7 +68,7 @@ def run(self):
     version=get_version(),
     cmdclass={
         'build_ext': BuildJsonnetExt,
+        'test': NoopTestCommand,
     },
     ext_modules=[jsonnet_ext],
-    test_suite="python._jsonnet_test",
 )

tests.sh

@@ -14,8 +14,8 @@ then
 else
     c-bindings-tests/run.sh
 
-    $PYTHON_COMMAND setup.py build
-    $PYTHON_COMMAND setup.py test
+    $PYTHON_COMMAND setup.py build --build-platlib .
+    $PYTHON_COMMAND -m pytest python
 fi
 
 export IMPLEMENTATION=golang