Install the correct python-api-core with AsyncIO support

Author: lidizheng

noxfile.py

@@ -36,7 +36,8 @@ def unit(session):
         'pyfakefs',
     )
     session.install('-e', '.')
-    session.install('git+https://github.com/lidizheng/python-api-core.git@aio-integration')
+    # TODO(lidiz) Remove this install after api-core released with AsyncIO support
+    session.install('-U', 'git+https://github.com/lidizheng/python-api-core.git@aio-integration#egg=google-api-core')
 
     session.run(
         'py.test',
@@ -68,9 +69,18 @@ def showcase(
         session.log('-' * 70)
 
     # Install pytest and gapic-generator-python
-    session.install('pytest')
+    session.install('pytest', 'git+https://github.com/pytest-dev/pytest-asyncio.git')
     session.install('-e', '.')
 
+    # TODO(lidiz) Remove this install after api-core released with AsyncIO support
+    session.install('-U', 'git+https://github.com/lidizheng/python-api-core.git@aio-integration#egg=google-api-core')
+
+    # TODO(lidiz) Remove the daily build install once new API got released.
+    session.install(
+        "--pre", "--upgrade", "--force-reinstall",
+        "--extra-index-url", "https://packages.grpc.io/archive/2020/04/3dca4a321326dfbf6e3656b6d5fc29cf5f4b6f95-76408568-daeb-49cd-b869-be2fd4066e8f/python",
+        "grpcio")
+
     # Install a client library for Showcase.
     with tempfile.TemporaryDirectory() as tmp_dir:
         # Download the Showcase descriptor.
@@ -119,15 +129,23 @@ def showcase_unit(
     """Run the generated unit tests against the Showcase library."""
 
     # Install pytest and gapic-generator-python
-    session.install(
-        "-e",
-        "git+https://github.com/googleapis/python-api-core.git@ca6c41cf460e505e6b228263170927270626222a#egg=google-api-core",
-    )
+    # TODO(lidiz) Remove this install after api-core released with AsyncIO support
+    session.install('-U', 'git+https://github.com/lidizheng/python-api-core.git@aio-integration#egg=google-api-core')
+    # session.install(
+    #     "-e",
+    #     "git+https://github.com/googleapis/python-api-core.git@ca6c41cf460e505e6b228263170927270626222a#egg=google-api-core",
+    # )
     session.install(
         'coverage', 'pytest', 'pytest-cov', 'pytest-xdist',
         'git+https://github.com/pytest-dev/pytest-asyncio.git')
     session.install('.')
 
+    # TODO(lidiz) Remove the daily build install once new API got released.
+    session.install(
+        "--pre", "--upgrade", "--force-reinstall",
+        "--extra-index-url", "https://packages.grpc.io/archive/2020/04/3dca4a321326dfbf6e3656b6d5fc29cf5f4b6f95-76408568-daeb-49cd-b869-be2fd4066e8f/python",
+        "grpcio")
+
     # Install a client library for Showcase.
     with tempfile.TemporaryDirectory() as tmp_dir: