When running unit tests using sinon-qunit, it can be rather annoying if you have to click through modal alert dialogs, and console errors can create clutter. However, failure scenarios in which these typically occur still need to be tested. Use this function to satisfy both requirements.

silence-alerts-and-console-in-sinon-qunit.js

/*
 * Use this method when we want to silence window alerts and console output within
 * a test case.
 * Most useful when testing error messages.
 *
 * Sample usage:
	test("should not show any dialogs or output to console", function() {
		this.silenceAlertsAndConsole();
		window.alert("Hello");
		console.log("World");
		this.silenceAlertsAndConsole(false);
	});
 *
 * params:
 * - isSilent: default=true
 */
function silenceAlertsAndConsole(isSilent) {
	if (!! isSilent || _.isUndefined(isSilent)) {
		//stub results not important, done here just to silence
		this.sandbox.stub(window, 'alert');
		this.sandbox.stub(window.console, 'error');
		this.sandbox.stub(window.console, 'log');
	}
	else {
		window.alert.restore();
		window.console.error.restore();
		window.console.log.restore();
	}
}