void setConflictDecision(int decision) {
		switch (decision) {
			case CANCELED:
			case ASK_USER:
			case KEEP_MY:
			case KEEP_LATEST:
			case KEEP_ORIGINAL:
				conflictOption = decision;
				break;
			default:
				throw new IllegalArgumentException();
		}
	}
For JUnit testing only, set the option for resolving a conflict.
@param decision CANCELED, ASK_USER, LATEST, MY, ORIGINAL
Ghidra/Features/Base/src/main/java/ghidra/app/merge/listing/CodeUnitMerger.java