content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio;
  
  import static org.junit.Assert.assertEquals;
  
  import org.junit.Test;
  import org.junit.runners.model.Statement;
  
  import java.io.ByteArrayOutputStream;
  import java.io.PrintStream;
  
  /**
   * Unit tests for {@link SystemErrRule}.
   */
  public class SystemErrRuleTest {
    private static final ByteArrayOutputStream OUTPUT = new ByteArrayOutputStream();
    private static final PrintStream ORIGINAL_SYSTEM_ERR = System.err;
  
    private Statement mStatement = new Statement() {
      @Override
      public void evaluate() throws Throwable {
        System.err.println("2048");
        assertEquals("2048\n", OUTPUT.toString());
        OUTPUT.reset();
  
        System.err.println("1234");
        assertEquals("1234\n", OUTPUT.toString());
      }
    };
  
    @Test
    public void testSystemErrRule() throws Throwable {
      new SystemErrRule(OUTPUT).apply(mStatement, null).evaluate();
      assertEquals(System.err, ORIGINAL_SYSTEM_ERR);
    }
  }
  