test: Fix flaky tests (googleapis#2221)

* test: Add logs to flaky OpenTelemetry test

* test: Ensure publisher is shutdown before checking spans in test

* test: Remove logs from test

* test: Check that subscription is created in subscriber samples test

* test: Use err to log for testing

* test: Only setup and teardown before and after the entire test suite for SubscriberIT

* test: Remove logs from test

* test: Import AfterClass class

* test: Fix errors in test

* test: Add small change to GCS ingestion test

google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/PublisherImplTest.java

@@ -1342,6 +1342,7 @@ public void testPublishOpenTelemetryTracing() throws Exception {
     fakeExecutor.advanceTime(Duration.ofSeconds(5));
     assertEquals("1", publishFuture.get());
     fakeExecutor.advanceTime(Duration.ofSeconds(5));
+    shutdownTestPublisher(publisher);
 
     List<SpanData> allSpans = openTelemetryTesting.getSpans();
     assertEquals(4, allSpans.size());

samples/snippets/src/test/java/pubsub/AdminIT.java

@@ -81,8 +81,8 @@ public class AdminIT {
   private static final String cloudStorageInputFormat = "text";
   private static final String cloudStorageTextDelimiter = ",";
   private static final String cloudStorageMatchGlob = "**.txt";
-  private static final String cloudStorageMinimumObjectCreateTime = "1970-01-01T00:00:00Z";
-  private static final String cloudStorageMinimumObjectCreateTimeSeconds = "0";
+  private static final String cloudStorageMinimumObjectCreateTime = "1970-01-01T00:00:01Z";
+  private static final String cloudStorageMinimumObjectCreateTimeSeconds = "seconds: 1";
 
   private static final TopicName topicName = TopicName.of(projectId, topicId);
   private static final TopicName kinesisIngestionTopicName =

samples/snippets/src/test/java/pubsub/SubscriberIT.java

@@ -39,15 +39,16 @@
 import java.util.List;
 import java.util.UUID;
 import org.junit.After;
+import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.Timeout;
 
 public class SubscriberIT {
-  private ByteArrayOutputStream bout;
-  private PrintStream out;
+  private static ByteArrayOutputStream bout;
+  private static PrintStream out;
 
   private static final String projectId = System.getenv("GOOGLE_CLOUD_PROJECT");
   private static final String _suffix = UUID.randomUUID().toString();
@@ -129,8 +130,8 @@ public static void checkRequirements() {
     requireEnvVar("GOOGLE_CLOUD_PROJECT");
   }
 
-  @Before
-  public void setUp() throws Exception {
+  @BeforeClass
+  public static void setUp() throws Exception {
     bout = new ByteArrayOutputStream();
     out = new PrintStream(bout);
     System.setOut(out);
@@ -162,8 +163,8 @@ public void setUp() throws Exception {
     }
   }
 
-  @After
-  public void tearDown() throws Exception {
+  @AfterClass
+  public static void tearDown() throws Exception {
     try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
       subscriptionAdminClient.deleteSubscription(subscriptionName.toString());
       subscriptionAdminClient.deleteSubscription(subscriptionEodName.toString());