test: add MultipleAttemptsRule to failing Compute tests (GoogleCloudPlatform#7498)

* test: add MultipleAttemptsRule to FirewallIT

* linting

* test: add retries to failing snippet IT

Author: kweinmeister

compute/cloud-client/src/test/java/compute/FirewallIT.java

@@ -22,6 +22,7 @@
 import com.google.api.gax.rpc.InvalidArgumentException;
 import com.google.api.gax.rpc.NotFoundException;
 import com.google.cloud.compute.v1.FirewallsClient;
+import com.google.cloud.testing.junit4.MultipleAttemptsRule;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
@@ -30,6 +31,7 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import org.junit.Assert;
+import org.junit.Rule;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeAll;
@@ -42,6 +44,7 @@
 @RunWith(JUnit4.class)
 @Timeout(value = 10, unit = TimeUnit.MINUTES)
 public class FirewallIT {
+  @Rule public final MultipleAttemptsRule multipleAttemptsRule = new MultipleAttemptsRule(3);
 
   private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
   private static String FIREWALL_RULE_CREATE;

compute/cloud-client/src/test/java/compute/SnippetsIT.java

@@ -30,6 +30,7 @@
 import com.google.cloud.storage.BucketInfo;
 import com.google.cloud.storage.Storage;
 import com.google.cloud.storage.StorageOptions;
+import com.google.cloud.testing.junit4.MultipleAttemptsRule;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
@@ -38,6 +39,7 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import org.junit.Assert;
+import org.junit.Rule;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeAll;
@@ -50,6 +52,7 @@
 @RunWith(JUnit4.class)
 @Timeout(value = 10, unit = TimeUnit.MINUTES)
 public class SnippetsIT {
+  @Rule public final MultipleAttemptsRule multipleAttemptsRule = new MultipleAttemptsRule(3);
 
   private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
   private static String ZONE;