(
var failing = [nil, []];
var working = [{DC.ar(0)}, {DC.ar([0, 0])}];
var stubs = [
	{ |args| LocalOut.ar(*args) },
	{ |args| Out.ar(0, *args) },
	{ |args| ReplaceOut.ar(0, *args) },
	{ |args| XOut.ar(0, 0.5, *args) },
];

var fails = failing.every { |input|
	stubs.every { |func|
		var fails = false;
		try { { func.(input) }.asSynthDef } { |err| fails = err.isException };
		if(fails.not) { "This is a case that should have failed:\n%\nOn this input:\n%\n".postf(func.cs, input) };
		fails
	}
};
var works = working.every { |input|
	stubs.every { |func|
		var works = true;
		try { { func.(input) }.asSynthDef } { |err| works = err.isException.not };
		if(works.not) { "This is a case that should not have failed:\n%\nOn this input:\n%\n".postf(func.cs, input) };
		works
	}
};

fails and: works
)