assertThat(Level.DEBUG.delFromMask(0x1), is(0x0));
assertThat(Level.DEBUG.toggle(0x2), is(0x3));
assertThat(Level.DEBUG.toggle(0x1), is(0x0));
assertThat(Level.DEBUG.delFromMask(0x1), is(0x0));
assertThat(Level.DEBUG.toggle(0x2), is(0x3));
assertThat(Level.DEBUG.toggle(0x1), is(0x0));