Update QuickStartIT.java

Fixes: #2715
Reviewing QuickstartIT, it:

* creates a bucket
* Writes a list of assets to the bucket
* wants to see that bucket in the list of assets
* deletes the bucket.
It should instead:

* Write to a well known bucket w/ gs:/well-known-bucket/UUID/my-assets.txt
* See if well-known-bucket is in my-assets.txt
This way there isn't a hysteresis problem on creating and knowing about buckets.

Author: Les Vogel

asset/cloud-client/src/test/java/com/example/asset/QuickStartIT.java

@@ -19,8 +19,6 @@
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.cloud.storage.BlobInfo;
-import com.google.cloud.storage.Bucket;
-import com.google.cloud.storage.BucketInfo;
 import com.google.cloud.storage.Storage;
 import com.google.cloud.storage.Storage.BlobListOption;
 import com.google.cloud.storage.StorageOptions;
@@ -37,31 +35,27 @@
 @RunWith(JUnit4.class)
 @SuppressWarnings("checkstyle:abbreviationaswordinname")
 public class QuickStartIT {
-  private static final String bucketName = UUID.randomUUID().toString();
+  private static final String bucketName = "java-docs-samples-testing";
+  private static final String path = UUID.randomUUID().toString();
   private ByteArrayOutputStream bout;
   private PrintStream out;
 
-  private static final void deleteBucket(String bucketName) {
+  private static final void deleteObjects() {
     Storage storage = StorageOptions.getDefaultInstance().getService();
-    for (BlobInfo info : storage.list(bucketName, BlobListOption.versions(true)).getValues()) {
+    for (BlobInfo info :
+        storage
+            .list(
+                bucketName,
+                BlobListOption.versions(true),
+                BlobListOption.currentDirectory(),
+                BlobListOption.prefix(path + "/"))
+            .getValues()) {
       storage.delete(info.getBlobId());
     }
-    storage.delete(bucketName);
-  }
-
-  private static final void createBucket(String bucketName) {
-    Storage storage = StorageOptions.getDefaultInstance().getService();
-    if (storage.get(bucketName) != null) {
-      // Bucket exists.
-      return;
-    }
-    Bucket bucket = storage.create(BucketInfo.of(bucketName));
-    assertThat(bucket).isNotNull();
   }
 
   @Before
   public void setUp() {
-    createBucket(bucketName);
     bout = new ByteArrayOutputStream();
     out = new PrintStream(bout);
     System.setOut(out);
@@ -71,12 +65,12 @@ public void setUp() {
   public void tearDown() {
     String consoleOutput = bout.toString();
     System.setOut(null);
-    deleteBucket(bucketName);
+    deleteObjects();
   }
 
   @Test
   public void testExportAssetExample() throws Exception {
-    String assetDumpPath = String.format("gs://%s/my-assets-dump.txt", bucketName);
+    String assetDumpPath = String.format("gs://%s/%s/my-assets-dump.txt", bucketName, path);
     ExportAssetsExample.main(assetDumpPath);
     String got = bout.toString();
     assertThat(got).contains(String.format("uri: \"%s\"", assetDumpPath));