Add smoke test for BEAM pipelines (#3037)

Created a smoke test to cover unit test gaps wrt BEAM:
- The Java and SDK compatibility in the pipeline container image
- The JPA setup in the pipelines

Both issues above can only be tested in a real pipeline.

This PR defines a new pipeline that performs a lightweight SQL
query and minimal processing. The build process can launch it
in a test environment to verify that the pipelines in the build
can run. The run script is also provided.

core/src/main/java/google/registry/beam/common/SmokeTestPipeline.java

@@ -0,0 +1,76 @@
+// Copyright 2026 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.beam.common;
+
+import static com.google.common.base.Verify.verify;
+
+import com.google.common.flogger.FluentLogger;
+import google.registry.model.tld.Tld;
+import google.registry.persistence.transaction.CriteriaQueryBuilder;
+import java.io.Serializable;
+import org.apache.beam.sdk.Pipeline;
+import org.apache.beam.sdk.PipelineResult;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.options.PipelineOptionsFactory;
+import org.apache.beam.sdk.transforms.Count;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.ParDo;
+
+/**
+ * For smoke test in the build/deployment process.
+ *
+ * <p>There two coverage gaps in unit tests for BEAM pipelines:
+ *
+ * <ul>
+ *   <li>The compatibility of the JVM and SDK in the pipeline image
+ *   <li>The JPA setup, which is performed by the {@link RegistryPipelineWorkerInitializer}
+ * </ul>
+ *
+ * <p>This classes defines a pipeline that performs one quick database query. The pipeline is
+ * expected to complete quickly, and the build or deployment process may launch it on GCP and wait
+ * for its completion to be certain that all aspects are tested for Nomulus pipelines.
+ */
+public class SmokeTestPipeline implements Serializable {
+  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
+
+  public static void main(String[] args) {
+    PipelineOptionsFactory.register(RegistryPipelineOptions.class);
+    RegistryPipelineOptions options =
+        PipelineOptionsFactory.fromArgs(args).withValidation().as(RegistryPipelineOptions.class);
+    runPipeline(options);
+  }
+
+  static PipelineResult runPipeline(RegistryPipelineOptions options) {
+    Pipeline pipeline = Pipeline.create(options);
+    pipeline
+        .apply(
+            "Read Tlds",
+            RegistryJpaIO.read(() -> CriteriaQueryBuilder.create(Tld.class).build(), Tld::getTldStr)
+                .withCoder(StringUtf8Coder.of()))
+        .apply("Count Tlds", Count.globally())
+        .apply(
+            "Verify Count",
+            ParDo.of(
+                new DoFn<Long, Void>() {
+                  @DoFn.ProcessElement
+                  public void processElement(@Element Long count) {
+                    logger.atInfo().log("Tld count: %s", count);
+                    verify(count > 0, "Expecting 1 or more, got %s.", count);
+                  }
+                }));
+
+    return pipeline.run();
+  }
+}

core/src/main/resources/google/registry/beam/smoke_test_pipeline_metadata.json

@@ -0,0 +1,24 @@
+{
+  "name": "Beam pipeline smoke test",
+  "description": "An Apache Beam pipeline that performs a simple database query.",
+  "parameters": [
+    {
+      "name": "registryEnvironment",
+      "label": "The Registry environment.",
+      "helpText": "The Registry environment.",
+      "is_optional": false,
+      "regexes": [
+        "^SANDBOX|CRASH$"
+      ]
+    },
+    {
+      "name": "isolationOverride",
+      "label": "The desired SQL transaction isolation level.",
+      "helpText": "The desired SQL transaction isolation level.",
+      "is_optional": true,
+      "regexes": [
+        "^[0-9A-Z_]+$"
+      ]
+    }
+  ]
+}

core/src/test/java/google/registry/beam/common/SmokeTestPipelineTest.java

@@ -0,0 +1,64 @@
+// Copyright 2026 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.beam.common;
+
+import static com.google.common.truth.Truth.assertThat;
+import static google.registry.persistence.PersistenceModule.TransactionIsolationLevel.TRANSACTION_REPEATABLE_READ;
+import static google.registry.testing.DatabaseHelper.createTld;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import google.registry.beam.TestPipelineExtension;
+import google.registry.persistence.transaction.JpaTestExtensions;
+import google.registry.testing.FakeClock;
+import java.time.Instant;
+import org.apache.beam.sdk.Pipeline;
+import org.apache.beam.sdk.options.PipelineOptionsFactory;
+import org.hibernate.cfg.AvailableSettings;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+public class SmokeTestPipelineTest {
+
+  private final FakeClock clock = new FakeClock(Instant.parse("2021-02-02T00:00:05.000Z"));
+
+  @RegisterExtension
+  final JpaTestExtensions.JpaIntegrationTestExtension jpa =
+      new JpaTestExtensions.Builder()
+          .withClock(clock)
+          .withProperty(AvailableSettings.ISOLATION, TRANSACTION_REPEATABLE_READ.name())
+          .buildIntegrationTestExtension();
+
+  @RegisterExtension
+  final TestPipelineExtension pipeline =
+      TestPipelineExtension.create().enableAbandonedNodeEnforcement(true);
+
+  private final RegistryPipelineOptions options =
+      PipelineOptionsFactory.create().as(RegistryPipelineOptions.class);
+
+  @Test
+  void whenIldsDoNotExist_failure() {
+    var exception =
+        assertThrows(
+            Pipeline.PipelineExecutionException.class,
+            () -> SmokeTestPipeline.runPipeline(options).waitUntilFinish());
+    assertThat(exception).hasMessageThat().contains("Expecting 1 or more, got 0.");
+  }
+
+  @Test
+  void whenTldsExist_success() {
+    createTld("tld");
+    SmokeTestPipeline.runPipeline(options).waitUntilFinish();
+  }
+}