function checkUnsupportedType(assert, oType, sFunction, vValue) {
		future.active = true;
		assert.throws(() => {
			// code under test - with UI5 2.0 unsupported types throw an Error
			oType[sFunction](vValue, "untype");
		}, new Error("data type 'untype' could not be found."));
		future.active = undefined;// restores configured default
	}
Calls the given function with the internal type "untype" on the given type instance and checks that an error is
thrown, that the internal type is not supported. Uses <code>future.active = true</code> to simulate the behavior
of UI5 2.x.

@param {object} assert The QUnit assert object
@param {sap.ui.model.type.Type} oType The type instance
@param {"formatValue"|"parseValue"} sFunction The function to be called on the type instance
@param {any} vValue The value to be passed to the function