content: /*
   * 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.testing;
  
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TestRule;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link RestoreSystemProperties}. */
  @RunWith(JUnit4.class)
  public class RestoreSystemPropertiesTest {
    @Rule public TestRule restoreSystemProperties = new RestoreSystemProperties();
  
    /*
     * Since these tests can run out of order, both test A and B verify that they
     * could insert their property and that the other does not exist.
     */
    @Test
    public void testThatPropertyIsClearedA() {
      System.getProperties().put("TestA", "TestA");
      assertNotNull(System.getProperty("TestA"));
      assertNull(System.getProperty("TestB"));
    }
  
    @Test
    public void testThatPropertyIsClearedB() {
      System.getProperties().put("TestB", "TestB");
      assertNotNull(System.getProperty("TestB"));
      assertNull(System.getProperty("TestA"));
    }
  }
  