Add GitHub Actions for Python unit tests (#1677)

* Add GitHub Actions for Python unit tests

* Add PythonPath

* Add health

* Add pwd

* Mock kube config

* Add Rest PATH

.github/workflows/test-python.yaml

@@ -0,0 +1,41 @@
+name: Python Test
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+
+      - name: Install Packages
+        run: |
+          pip install grpcio-testing==1.40.0
+          pip install pytest==5.1.2
+
+          pip install -r cmd/suggestion/chocolate/v1beta1/requirements.txt
+          pip install -r cmd/suggestion/hyperopt/v1beta1/requirements.txt
+          pip install -r cmd/suggestion/skopt/v1beta1/requirements.txt
+          pip install -r cmd/suggestion/optuna/v1beta1/requirements.txt
+          pip install -r cmd/suggestion/nas/enas/v1beta1/requirements.txt
+          pip install -r cmd/suggestion/hyperband/v1beta1/requirements.txt
+          pip install -r cmd/suggestion/nas/darts/v1beta1/requirements.txt
+
+          pip install -r cmd/earlystopping/medianstop/v1beta1/requirements.txt
+
+      - name: Run Python test
+        run: |
+          export PYTHONPATH=$(pwd):$(pwd)/pkg/apis/manager/v1beta1/python:$(pwd)/pkg/apis/manager/health/python
+          echo $PYTHONPATH
+          pytest ./test/unit/v1beta1/suggestion
+          pytest ./test/unit/v1beta1/earlystopping

test/earlystopping/v1beta1/test_medianstop_service.py → test/unit/v1beta1/earlystopping/test_medianstop_service.py

@@ -15,6 +15,7 @@
 import grpc
 import grpc_testing
 import unittest
+from unittest.mock import patch
 
 from pkg.apis.manager.v1beta1.python import api_pb2
 
@@ -23,6 +24,11 @@
 
 class TestMedianStop(unittest.TestCase):
     def setUp(self):
+        # Mock load Kubernetes config.
+        patcher = patch('pkg.earlystopping.v1beta1.medianstop.service.config.load_kube_config')
+        self.mock_sum = patcher.start()
+        self.addCleanup(patcher.stop)
+
         servicers = {
             api_pb2.DESCRIPTOR.services_by_name['EarlyStopping']: MedianStopService(
             )
@@ -60,7 +66,7 @@ def test_get_earlystopping_rules(self):
             invocation_metadata={},
             request=request, timeout=1)
 
-        response, metadata, code, details = get_earlystopping_rules.termination()
+        _, _, code, _ = get_earlystopping_rules.termination()
 
         self.assertEqual(code, grpc.StatusCode.OK)