@Test
public void getOsTotalFreeMemorySize() {

  final List<String> lines =
      Arrays.asList("MemFree:        1 kB", "Buffers:          2 kB", "Cached:          3 kB",
          "SwapFree:    4 kB",
          "Foo: 10 kB");
  final long size = this.util.getOsTotalFreeMemorySizeFromStrings(lines, OsMemoryUtil.MEM_KEYS);
  assertEquals(10, size);
}