docs: add steps for testing the connector (#616)

.envrc.example

@@ -1,4 +1,8 @@
-export ALLOYDB_URI=projects/<PROJECT-ID>/locations/<REGION>/clusters/<CLUSTER>/instances/<INSTANCE>
-export ALLOYDB_USER=some-user
-export ALLOYDB_PASS=some-password
-export ALLOYDB_DB=some-db-name
+export ALLOYDB_DB="some-db"
+export ALLOYDB_USER="some-user"
+export ALLOYDB_PASS="some-password"
+export ALLOYDB_INSTANCE_NAME="projects/<PROJECT>/locations/<REGION>/clusters/<CLUSTER>/instances/<INSTANCE>"
+export ALLOYDB_INSTANCE_IP="some-IP-address"
+export ALLOYDB_IAM_USER="[email protected]"
+export ALLOYDB_IMPERSONATED_USER="some-impersonated-IAM-user"
+export ALLOYDB_PSC_INSTANCE_URI="projects/<PROJECT>/locations/<REGION>/clusters/<CLUSTER>/instances/<INSTANCE>"

CONTRIBUTING.md

@@ -26,3 +26,10 @@ information on using pull requests.
 
 This project follows [Google's Open Source Community
 Guidelines](https://opensource.google/conduct/).
+
+## Testing
+
+NOTE: Be sure to run the following commands in the same VPC as the AlloyDB instance
+
+1. Set the environment variables. You can see an example of the environment variables needed by running `cat .envrc.example`
+1. Run the tests by using: `go test`