docs(samples): fix undeleteTable sample IT failure (#1912)

Caused by empty table schema Fixes #1911

Author: stephaniewang526

samples/snippets/src/test/java/com/example/bigquery/UndeleteTableIT.java

@@ -19,7 +19,9 @@
 import static com.google.common.truth.Truth.assertThat;
 import static junit.framework.TestCase.assertNotNull;
 
+import com.google.cloud.bigquery.Field;
 import com.google.cloud.bigquery.Schema;
+import com.google.cloud.bigquery.StandardSQLTypeName;
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
 import java.util.UUID;
@@ -62,7 +64,11 @@ public void setUp() {
  tableName = "UNDELETE_TABLE_TEST_" + UUID.randomUUID().toString().substring(0, 8);
  recoverTableName = "RECOVER_DELETE_TABLE_TEST_" + UUID.randomUUID().toString().substring(0, 8);
  // Create table in dataset for testing
- CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, Schema.of());
+ Schema schema =
+ Schema.of(
+ Field.of("stringField", StandardSQLTypeName.STRING),
+ Field.of("booleanField", StandardSQLTypeName.BOOL));
+ CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, schema);
  }
 
  @After