crunch-core/src/test/java/org/apache/crunch/lib/PTablesTest.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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 */
package org.apache.crunch.lib;

import com.google.common.collect.ImmutableMap;
import org.apache.crunch.PTable;
import org.apache.crunch.impl.mem.MemPipeline;
import org.junit.Test;

import java.util.Map;

import static org.apache.crunch.types.avro.Avros.longs;
import static org.apache.crunch.types.avro.Avros.strings;
import static org.apache.crunch.types.avro.Avros.tableOf;
import static org.junit.Assert.assertEquals;

public class PTablesTest {
  @Test
  public void testSwapKeyValue() {
    PTable<String, Long> table = MemPipeline.typedTableOf(tableOf(strings(), longs()), "hello", 14L, "goodbye", 21L);
    PTable<Long, String> actual = PTables.swapKeyValue(table);
    Map<Long, String> expected = ImmutableMap.of(14L, "hello", 21L, "goodbye");
    assertEquals(expected, actual.materializeToMap());
  }
}