@Test
	public void testAsKeySetSubSize() {
		populateStore(-3, -1, 1, 3);
		assertEquals(0, keySet.subSet(-2L, true, -2L, false).size());
		assertTrue(keySet.subSet(-2L, true, -2L, false).isEmpty());
		assertEquals(2, keySet.subSet(-2L, true, 2L, true).size());
		assertFalse(keySet.subSet(-2L, true, 2L, true).isEmpty());
	}
This exists to verify behavior in {@link #testAsValuesSubIterator()}
Ghidra/Debug/ProposedUtils/src/test/java/ghidra/util/database/DBCachedObjectStoreTest.java