/*
 * 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.geode.internal.lang;

import static org.junit.Assert.*;

import java.lang.management.ManagementFactory;

import org.junit.Test;
import org.junit.experimental.categories.Category;

import org.apache.geode.test.junit.categories.UnitTest;

/**
 * The SystemUtilsJUnitTest class is a test suite of test cases for testing the contract and
 * functionality of the SystemUtils class.
 * <p/>
 * 
 * @see org.apache.geode.internal.lang.SystemUtils
 * @see org.junit.Assert
 * @see org.junit.Test
 * @since GemFire 6.8
 */
@Category(UnitTest.class)
public class SystemUtilsJUnitTest {

  // NOTE this test adds some maintenance overhead but ensure the correct functioning of GemFire
  // code that relies on
  // SystemUtils.isJavaVersionAtLeast
  @Test
  public void testIsJavaVersionAtLeast() {
    // note, the expected version value should be set to the minimum supported version of the Java
    // Runtime Environment
    // (JRE) for GemFire
    assertTrue(SystemUtils.isJavaVersionAtLeast("1.8"));
    // note, the expected version value should be set to the next version of the Java Runtime
    // Environment (JRE)
    // not currently available.
    assertFalse(SystemUtils.isJavaVersionAtLeast("1.9"));
  }

  @Test
  public void testIsAppleJVM() {
    final boolean expected = ManagementFactory.getRuntimeMXBean().getVmVendor()
        .contains(SystemUtils.APPLE_JVM_VENDOR_NAME);
    assertEquals(expected, SystemUtils.isAppleJVM());
  }

  @Test
  public void testIsOracleJVM() {
    final boolean expected = ManagementFactory.getRuntimeMXBean().getVmVendor()
        .contains(SystemUtils.ORACLE_JVM_VENDOR_NAME);
    assertEquals(expected, SystemUtils.isOracleJVM());
  }

  @Test
  public void testIsHotSpotVM() {
    final boolean expected = ManagementFactory.getRuntimeMXBean().getVmName()
        .contains(SystemUtils.JAVA_HOTSPOT_JVM_NAME);
    assertEquals(expected, SystemUtils.isHotSpotVM());
  }

  @Test
  public void testIsJ9VM() {
    final boolean expected =
        ManagementFactory.getRuntimeMXBean().getVmName().contains(SystemUtils.IBM_J9_JVM_NAME);
    assertEquals(expected, SystemUtils.isJ9VM());
  }

  @Test
  public void testIsJRockitVM() {
    final boolean expected = ManagementFactory.getRuntimeMXBean().getVmName()
        .contains(SystemUtils.ORACLE_JROCKIT_JVM_NAME);
    assertEquals(expected, SystemUtils.isJRockitVM());
  }

  @Test
  public void testIsLinux() {
    final boolean expected =
        ManagementFactory.getOperatingSystemMXBean().getName().contains(SystemUtils.LINUX_OS_NAME);
    assertEquals(expected, SystemUtils.isLinux());
  }

  @Test
  public void testIsMacOSX() {
    final boolean expected =
        ManagementFactory.getOperatingSystemMXBean().getName().contains(SystemUtils.MAC_OSX_NAME);
    assertEquals(expected, SystemUtils.isMacOSX());
  }

  @Test
  public void testIsWindows() throws Exception {
    final boolean expected = ManagementFactory.getOperatingSystemMXBean().getName()
        .contains(SystemUtils.WINDOWS_OS_NAME);
    assertEquals(expected, SystemUtils.isWindows());
  }

}