/*
    * Copyright 2019-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware;
   
   import static org.hamcrest.MatcherAssert.assertThat;
   import static org.hamcrest.Matchers.containsString;
   import static org.hamcrest.Matchers.greaterThanOrEqualTo;
  import static org.hamcrest.Matchers.is;
  import static org.hamcrest.Matchers.lessThanOrEqualTo;
  import static org.hamcrest.Matchers.notNullValue;
  
  import org.junit.jupiter.api.Test;
  
  import oshi.SystemInfo;
  
  /**
   * Test GlobalMemory
   */
  class VirtualMemoryTest {
      /**
       * Test VirtualMemory.
       */
      @Test
      void testGlobalMemory() {
          SystemInfo si = new SystemInfo();
          HardwareAbstractionLayer hal = si.getHardware();
          GlobalMemory memory = hal.getMemory();
          VirtualMemory vm = memory.getVirtualMemory();
          assertThat("VM object shouldn't be null", vm, is(notNullValue()));
  
          // Swap tests
          assertThat("VM's swap pages in shouldn't be negative", vm.getSwapPagesIn(), is(greaterThanOrEqualTo(0L)));
          assertThat("VM's swap pages out shouldn't be negative", vm.getSwapPagesOut(), is(greaterThanOrEqualTo(0L)));
          assertThat("VM's swap total shouldn't be negative", vm.getSwapTotal(), is(greaterThanOrEqualTo(0L)));
          assertThat("VM's swap used shouldn't be negative", vm.getSwapUsed(), is(greaterThanOrEqualTo(0L)));
          assertThat("VM's swap used should be less than or equal to VM swap total", vm.getSwapUsed(),
                  is(lessThanOrEqualTo(vm.getSwapTotal())));
          assertThat("VM's max should be greater than or qual to VM swap total", vm.getVirtualMax() >= vm.getSwapTotal(),
                  is(true));
          assertThat("VM's virtual in use shouldn't be negative", vm.getVirtualInUse(), is(greaterThanOrEqualTo(0L)));
          assertThat("VM's toString contains 'Used'", vm.toString(), containsString("Used"));
      }
  }