bigquery: wait for copy to finish (#1456)

BigQuery integration tests previously create a table-copy job,
verify properties, and delete the destination table.

Deletion will fail if BigQuery hasn't gotten around to copy the table
yet.
The fix is to wait for the job to finish (1 min timeout) before deleting.

google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/it/ITBigQueryTest.java

@@ -25,6 +25,7 @@
 import static org.junit.Assert.fail;
 
 import com.google.cloud.Page;
+import com.google.cloud.WaitForOption;
 import com.google.cloud.bigquery.BigQuery;
 import com.google.cloud.bigquery.BigQuery.DatasetField;
 import com.google.cloud.bigquery.BigQuery.DatasetOption;
@@ -899,7 +900,7 @@ public void testListJobsWithSelectedFields() {
   }
 
   @Test
-  public void testCreateAndGetJob() {
+  public void testCreateAndGetJob() throws InterruptedException, TimeoutException {
     String sourceTableName = "test_create_and_get_job_source_table";
     String destinationTableName = "test_create_and_get_job_destination_table";
     TableId sourceTable = TableId.of(DATASET, sourceTableName);
@@ -930,11 +931,18 @@ public void testCreateAndGetJob() {
     assertEquals(createdJob.getSelfLink(), remoteJob.getSelfLink());
     assertEquals(createdJob.getUserEmail(), remoteJob.getUserEmail());
     assertTrue(createdTable.delete());
+
+    Job completedJob =
+        remoteJob.waitFor(
+            WaitForOption.checkEvery(1, TimeUnit.SECONDS),
+            WaitForOption.timeout(1, TimeUnit.MINUTES));
+    assertNotNull(completedJob);
+    assertNull(completedJob.getStatus().getError());
     assertTrue(bigquery.delete(DATASET, destinationTableName));
   }
 
   @Test
-  public void testCreateAndGetJobWithSelectedFields() {
+  public void testCreateAndGetJobWithSelectedFields() throws InterruptedException, TimeoutException {
     String sourceTableName = "test_create_and_get_job_with_selected_fields_source_table";
     String destinationTableName = "test_create_and_get_job_with_selected_fields_destination_table";
     TableId sourceTable = TableId.of(DATASET, sourceTableName);
@@ -972,6 +980,13 @@ public void testCreateAndGetJobWithSelectedFields() {
     assertNull(remoteJob.getSelfLink());
     assertNull(remoteJob.getUserEmail());
     assertTrue(createdTable.delete());
+
+    Job completedJob =
+        remoteJob.waitFor(
+            WaitForOption.checkEvery(1, TimeUnit.SECONDS),
+            WaitForOption.timeout(1, TimeUnit.MINUTES));
+    assertNotNull(completedJob);
+    assertNull(completedJob.getStatus().getError());
     assertTrue(bigquery.delete(DATASET, destinationTableName));
   }