private Data getDataAt(long offset) {
		Data data = listing.getDataAt(addr(offset));
		assertNotNull("expected data at address 0x" + Long.toHexString(offset));
		return data;
	}
Test setting default and instance settings on Data.
Ghidra/Features/Base/src/test.slow/java/ghidra/program/database/data/InstanceSettingsTest.java