/*
* 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
* limitations under the License.
*/
package org.apache.beam.sdk.transforms;
import static org.apache.beam.sdk.TestUtils.NO_LINES;
import static org.junit.Assert.assertEquals;
import java.util.Arrays;
import java.util.List;
import org.apache.beam.sdk.coders.StringUtf8Coder;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.testing.ValidatesRunner;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for Count.
*/
@RunWith(JUnit4.class)
public class CountTest {
static final String[] WORDS_ARRAY = new String[] {
"hi", "there", "hi", "hi", "sue", "bob",
"hi", "sue", "", "", "ZOW", "bob", "" };
static final List<String> WORDS = Arrays.asList(WORDS_ARRAY);
@Rule
public TestPipeline p = TestPipeline.create();
@Test
@Category(ValidatesRunner.class)
@SuppressWarnings("unchecked")
public void testCountPerElementBasic() {
PCollection<String> input = p.apply(Create.of(WORDS));
PCollection<KV<String, Long>> output =
input.apply(Count.<String>perElement());
PAssert.that(output)
.containsInAnyOrder(
KV.of("hi", 4L),
KV.of("there", 1L),
KV.of("sue", 2L),
KV.of("bob", 2L),
KV.of("", 3L),
KV.of("ZOW", 1L));
p.run();
}
@Test
@Category(ValidatesRunner.class)
@SuppressWarnings("unchecked")
public void testCountPerElementEmpty() {
PCollection<String> input = p.apply(Create.of(NO_LINES).withCoder(StringUtf8Coder.of()));
PCollection<KV<String, Long>> output =
input.apply(Count.<String>perElement());
PAssert.that(output).empty();
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testCountGloballyBasic() {
PCollection<String> input = p.apply(Create.of(WORDS));
PCollection<Long> output =
input.apply(Count.<String>globally());
PAssert.that(output)
.containsInAnyOrder(13L);
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testCountGloballyEmpty() {
PCollection<String> input = p.apply(Create.of(NO_LINES).withCoder(StringUtf8Coder.of()));
PCollection<Long> output =
input.apply(Count.<String>globally());
PAssert.that(output)
.containsInAnyOrder(0L);
p.run();
}
@Test
public void testCountGetName() {
assertEquals("Count.PerElement", Count.perElement().getName());
assertEquals("Combine.globally(Count)", Count.globally().getName());
}
}