Pin pytest version (#9767)

ci/asan_tests/ray-project/requirements.txt

@@ -19,7 +19,7 @@ Pillow
 prometheus_client
 py-spy
 pygments
-pytest
+pytest==5.4.3
 pytest-asyncio
 pytest-rerunfailures
 pytest-sugar

ci/asan_tests/run_asan_tests.sh

@@ -11,7 +11,7 @@ asan_install() {
 asan_setup() {
   echo "Setting up the environment"
   pip install -r ray-project/requirements.txt
-  pip install -U pytest
+  pip install -U pytest==5.4.3
 
   echo "Installing cython example"
   (cd "${ROOT_DIR}"/../doc/examples/cython && python setup.py install --user)

ci/travis/install-dependencies.sh

@@ -237,7 +237,7 @@ install_dependencies() {
     esac
     pip_packages+=(scipy tensorflow=="${tf_version}" cython==0.29.0 gym \
       opencv-python-headless pyyaml pandas==1.0.5 requests feather-format lxml openpyxl xlrd \
-      py-spy pytest pytest-timeout networkx tabulate aiohttp uvicorn dataclasses pygments werkzeug \
+      py-spy pytest==5.4.3 pytest-timeout networkx tabulate aiohttp uvicorn dataclasses pygments werkzeug \
       kubernetes flask grpcio pytest-sugar pytest-rerunfailures pytest-asyncio scikit-learn==0.22.2 numba \
       Pillow prometheus_client boto3 pettingzoo mypy)
     if [ "${OSTYPE}" != msys ]; then

ci/travis/test-wheels.sh

@@ -71,7 +71,7 @@ if [[ "$platform" == "linux" ]]; then
     "$PYTHON_EXE" -u -c "import ray; print(ray.__commit__)" | grep "$TRAVIS_COMMIT" || (echo "ray.__commit__ not set properly!" && exit 1)
 
     # Install the dependencies to run the tests.
-    "$PIP_CMD" install -q aiohttp google grpcio pytest requests
+    "$PIP_CMD" install -q aiohttp google grpcio pytest==5.4.3 requests
 
     # Run a simple test script to make sure that the wheel works.
     for SCRIPT in "${TEST_SCRIPTS[@]}"; do
@@ -112,7 +112,7 @@ elif [[ "$platform" == "macosx" ]]; then
     "$PIP_CMD" install -q "$PYTHON_WHEEL"
 
     # Install the dependencies to run the tests.
-    "$PIP_CMD" install -q aiohttp google grpcio pytest requests
+    "$PIP_CMD" install -q aiohttp google grpcio pytest==5.4.3 requests
 
     # Run a simple test script to make sure that the wheel works.
     for SCRIPT in "${TEST_SCRIPTS[@]}"; do