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TESTING.md

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Testing

Most packages have up to four common sets of tests. A package called Foo might have:

  • Foo.Tests: unit tests. These should run quickly, in most cases without an internet connection being required.
  • Foo.IntegrationTests: integration tests. These check that our packages work correctly with the real API.
  • Foo.Snippets: documentation snippets, written and executed as tests. These often double up as integration tests. (If a snippet can test everything you need to know about a call, there's no point in also having an integration test.) For gRPC APIs, this project contains autogenerated as well as handwritten code; the autogenerated code is only used for documentation.
  • Foo.SmokeTests: autogenerated tests that ensure we can at least contact the relevant API.

The test types other than unit tests require:

  • An internet connection
  • A Google Cloud Platform project
  • Billing enabled
  • The APIs you're testing enabled
  • A service account with appropriate access
  • Common environment variables set as described below
  • Per-API configuration as shown later, in some cases

Running these tests can cost you money. They execute against paid-for Google services. They can also produce significant chunks of network traffic - particularly some of the integration tests. You're not recommended to run them against a mobile internet connection unless you're sure you know what you're doing.

These tests could destroy data in the projects they run in, or leave test data afterwards. Most tests create data in a well-partitioned way and clean up after themselves, but there could be a bug in a test which wipes all the data in the project. It is very strongly recommended that you only run tests against projects which do not contain any production data or services.

Running tests

The build.sh script will run unit tests, and runintegrationtests.sh will run integration tests and snippets. (TODO: smoke tests too...) Consult the scripts for details on how to run.

Additionally, you can just use dotnet test in any test project, optionally specifying a test filter and/or target framework.

Common environment variables

To run the integration/smoke tests or snippets, set the following environment variables:

  • TEST_PROJECT: The name of the Google Cloud Project to test against
  • GOOGLE_APPLICATION_CREDENTIALS: The absolute path to a JSON file containing service credentials for the test project.
  • TEST_PROJECT_LOCATION: For APIs that require an App Engine project, this is the location ID of the App Engine project, such as "us-central1".
  • MUST_NOT_SKIP_TESTS: If this is set to any non-empty value, tests that require other environment variables will fail rather than being skipped. (Tests that require more elaborate configuration default to being skipped to avoid placing an unnecessary burden on developers, but we want to run them in CI.)

Service account access requirements

Almost all tests can be executed using a service account with the "Editor" role in the project. Additionally, some Storage and PubSub tests require the "Pub/Sub Admin" role.

Per API configuration

Some APIs require a little more setup. If you're not testing an API listed below, the instructions above should be all you need.

Google.Cloud.Bigtable.V2 and Google.Cloud.Bigtable.Admin.V2

The Bigtable integration tests can be run against the production service or the emulator.

Running in production requires:

  • A Bigtable instance, preferably of type Development, created within the project and identified by the BIGTABLE_TEST_INSTANCE environment variable
  • The account identified in your service account JSON file to have read/write access to the project, including the IAM permissions in the Bigtable Administrator role

Running against the emulator requires:

  • A running emulator on the local machine, started by using the gcloud beta emulators bigtable start command
  • The BIGTABLE_EMULATOR_HOST environment variable set to localhost:8086

Currently there are no runnable snippets, but when they are added, they will have the same requirements.

Google.Cloud.Firestore

Firestore cannot currently operate on a Google Cloud project that also has a Datastore database. You will need a second project:

  • Create a project on the Firebase Console
  • Enable Firestore on that project (within the Firebase Console)
  • Set the FIRESTORE_TEST_PROJECT environment variable with that project ID
  • Add the account identified in your service account JSON file as an owner of the project, or download the service account JSON file for the Firestore project, and change the GOOGLE_APPLICATION_CREDENTIALS environment variable when you want to run the Firestore tests.

Google.Cloud.Storage.V1

  • Enable the Google Cloud Pub/Sub API as well as Google Cloud Storage
  • Follow the instructions for giving the Storage service account access to Cloud KMS.

Environment variables for KMS testing (all just IDs rather than full resource names):

  • US_KMS_TEST_KEYRING: The ID of a keyring in the "us" location.
  • US_KMS_TEST_KEY1: The ID of a key within the above US keyring
  • US_KMS_TEST_KEY2: The ID of a second key within the above US keyring
  • REQUESTER_PAYS_TEST_PROJECT: The ID of a second project to use when testing the "requester pays" feature.
  • REQUESTER_PAYS_CREDENTIALS: The path to a service account credentials file for the requester pays project

Google.Cloud.Vision.V1

The test project must have a populated product set, and have AutoML configured appropriately. To create the product set expected by the snippets, change to the apis/Google.Cloud.Vision.V1 directory and run:

dotnet run -p Google.Cloud.Vision.V1.PopulateProductSearchTestSet -- Google.Cloud.Vision.V1.Snippets {YOUR_PROJECT_ID}

Wait about half an hour before running the snippets, so that the Vision service is able to train its model appropriately.

To configure the project (in terms of permissions), visit the AutoML Vision console, type in your project ID, click "Continue", and then click "Set up now" on the next page.