test: add back emulator test workflow

.github/workflows/test_suite.yml

@@ -0,0 +1,31 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+name: SQLAlchemy Spanner dialect
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    services:
+      emulator-0:
+        image: gcr.io/cloud-spanner-emulator/emulator:latest
+        ports:
+          - 9010:9010
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - name: Install nox
+        run: python -m pip install nox
+      - name: Run SQLAlchemy tests
+        run: nox
+        env:
+          SPANNER_EMULATOR_HOST: localhost:9010
+          GOOGLE_CLOUD_PROJECT: appdev-soda-spanner-staging
+

create_test_database.py

@@ -57,10 +57,10 @@ def prep_instance():
     # Filter out non "us" locations
     configs = [config for config in configs if "-us-" in config.name]
 
-    instance_config = configs[0].name
+    instance_config = 'us-central1' if USE_EMULATOR else configs[0].name
     create_time = str(int(time.time()))
     unique_resource_id = '%s%d' % ('-', 1000 * time.time())
-    instance_id = "sqlalchemy-test" + unique_resource_id
+    instance_id = 'sqlalchemy-dialect-test' if USE_EMULATOR else "sqlalchemy-test" + unique_resource_id
     labels = {"python-spanner-sqlalchemy-systest": "true", "created": create_time}
 
     instance = CLIENT.instance(instance_id, instance_config, labels=labels)

test/test_suite.py

@@ -14,9 +14,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import decimal
 import operator
+import os
 import pytest
-import decimal
 import pytz
 
 import sqlalchemy
@@ -1008,6 +1009,10 @@ def test_text_roundtrip(self):
         eq_(row, ("some text",))
 
 
+@pytest.mark.skipif(
+    os.getenv("SPANNER_EMULATOR_HOST"),
+    reason="Numeric type isn't supported by emulator yet",
+)
 class NumericTest(_NumericTest):
     @emits_warning(r".*does \*not\* support Decimal objects natively")
     def test_render_literal_numeric(self):