@Test
public void testGetBooleanWithTrueValue() {

    System.setProperty("key", "true");
    assertTrue(SystemPropertyUtil.getBoolean("key", false));
    System.setProperty("key", "yes");
    assertTrue(SystemPropertyUtil.getBoolean("key", false));
    System.setProperty("key", "1");
    assertTrue(SystemPropertyUtil.getBoolean("key", true));
}