hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestNativeLibraryChecker.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.hadoop.util;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import junit.framework.TestCase;

import org.apache.hadoop.util.ExitUtil.ExitException;
import org.junit.Test;

public class TestNativeLibraryChecker extends TestCase {
  private void expectExit(String [] args) {
    try {
      // should throw exit exception
      NativeLibraryChecker.main(args);
      fail("should call exit");
    } catch (ExitException e) {
      // pass
      ExitUtil.resetFirstExitException();
    }
  }
  
  @Test
  public void testNativeLibraryChecker() {
    ExitUtil.disableSystemExit();
    // help should return normally
    NativeLibraryChecker.main(new String[] {"-h"});
    // illegal argmuments should exit
    expectExit(new String[] {"-a", "-h"});
    expectExit(new String[] {"aaa"});
    if (NativeCodeLoader.isNativeCodeLoaded()) {
      // no argument should return normally
      NativeLibraryChecker.main(new String[0]);
    } else {
      // no argument should exit
      expectExit(new String[0]);
    }
  }

  @Test
  public void testNativeLibraryCheckerOutput(){
    expectOutput(new String[]{"-a"});
    // no argument
    expectOutput(new String[0]);
  }

  private void expectOutput(String [] args) {
    ExitUtil.disableSystemExit();
    ByteArrayOutputStream outContent = new ByteArrayOutputStream();
    PrintStream originalPs = System.out;
    System.setOut(new PrintStream(outContent));
    try {
      NativeLibraryChecker.main(args);
    } catch (ExitException e) {
      ExitUtil.resetFirstExitException();
    } finally {
      if (Shell.WINDOWS) {
        assertEquals(outContent.toString().indexOf("winutils: true") != -1, true);
      }
      if (NativeCodeLoader.isNativeCodeLoaded()) {
        assertEquals(outContent.toString().indexOf("hadoop:  true") != -1, true);
      }
      System.setOut(originalPs);
    }
  }
}