sdks/java/core/src/test/java/org/apache/beam/sdk/transforms/ImpulseTest.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
 * limitations under the License.
 */
package org.apache.beam.sdk.transforms;

import java.util.Arrays;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.testing.UsesImpulse;
import org.apache.beam.sdk.testing.ValidatesRunner;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.TypeDescriptors;
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 Impulse. */
@RunWith(JUnit4.class)
public class ImpulseTest {
  @Rule public transient TestPipeline p = TestPipeline.create();

  @Test
  @Category({ValidatesRunner.class, UsesImpulse.class})
  public void testImpulse() {
    PCollection<Integer> result =
        p.apply(Impulse.create())
            .apply(
                FlatMapElements.into(TypeDescriptors.integers())
                    .via(impulse -> Arrays.asList(1, 2, 3)));
    PAssert.that(result).containsInAnyOrder(1, 2, 3);
    p.run().waitUntilFinish();
  }
}