Buster.JS: Exception-bug (not in this case though...)

exceptions.test.js

var testable = function(arg) {
	if(!arg) {
		throw new Error("Input not valid");
	}
	return arg;
};

buster.testCase("Buster.JS Exception no work", {
	"testable can be called": function() {
		assert.defined(testable);
	},
	
	"testable doesn't allow no arg's": function() {
		assert.exception(function() {
			testable();
		});
	},
	
	"testable allows strings": function() {
		var t = testable("test");
		assert.equals(t, "test");
	},
	
	"testable doesn't allow arrays": function() {
		assert.exception(function() {
			testable([]);
		});
	}
});