@Test
	public void testAsMapSubTailMap() {
		assertEquals(KeySpan.closed(-2, 1),
			map.subMap(-4L, true, 2L, false).tailMap(-2L, true).keySpan);
		assertEquals(KeySpan.closed(-1, 2),
			rMap.subMap(4L, true, -2L, false).tailMap(2L, true).keySpan);
	}
This exists to verify behavior in {@link #testAsValuesSubIterator()}
Ghidra/Debug/ProposedUtils/src/test/java/ghidra/util/database/DBCachedObjectStoreTest.java