@Override
	public String getCallingConventionName() {
		return Function.UNKNOWN_CALLING_CONVENTION_STRING;
	}
A stub of the {@link FunctionSignature} interface.  This can be used to supply a test program 
manager or to spy on system internals by overriding methods as needed.
Ghidra/Framework/SoftwareModeling/src/test/java/ghidra/program/model/TestDoubleFunctionSignature.java