/
QueryPaginationIT.java
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/
QueryPaginationIT.java
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/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.bigquery;
import static com.google.common.truth.Truth.assertThat;
import static junit.framework.TestCase.assertNotNull;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.UUID;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
public class QueryPaginationIT {
private String tableName;
private ByteArrayOutputStream bout;
private PrintStream out;
private static final String BIGQUERY_DATASET_NAME = requireEnvVar("BIGQUERY_DATASET_NAME");
private static String requireEnvVar(String varName) {
String value = System.getenv(varName);
assertNotNull(
"Environment variable " + varName + " is required to perform these tests.",
System.getenv(varName));
return value;
}
@BeforeClass
public static void checkRequirements() {
requireEnvVar("BIGQUERY_DATASET_NAME");
}
@Before
public void setUp() {
tableName =
"QUERY_PAGINATION_TABLE_FROM_GCS_TEST_" + UUID.randomUUID().toString().substring(0, 8);
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}
@After
public void tearDown() {
// Clean up
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
System.setOut(null);
}
@Test
public void testQueryPagination() {
String query =
"SELECT name, SUM(number) as total_people"
+ " FROM `bigquery-public-data.usa_names.usa_1910_2013`"
+ " GROUP BY name"
+ " ORDER BY total_people DESC"
+ " LIMIT 100";
QueryPagination.queryPagination(BIGQUERY_DATASET_NAME, tableName, query);
assertThat(bout.toString()).contains("Query pagination performed successfully.");
}
}