Issue box#159: Added setErrorHandler to override default error handling

lib/application.js

@@ -52,6 +52,7 @@ Box.Application = (function() {
 		behaviors = {},      // Information about each registered behavior by behaviorName
 		instances = {},      // Module instances keyed by DOM element id
 		initialized = false, // Flag whether the application has been initialized
+		customErrorHandler = null,
 
 		application = new Box.EventTarget();	// base object for application
 
@@ -135,7 +136,10 @@ Box.Application = (function() {
 	 * @private
 	 */
 	function error(exception) {
-
+		if (typeof customErrorHandler === 'function') {
+			customErrorHandler(exception);
+			return;
+		}
 		if (globalConfig.debug) {
 			throw exception;
 		} else {
@@ -810,6 +814,16 @@ Box.Application = (function() {
 		// Error reporting
 		//----------------------------------------------------------------------
 
+		/**
+		 * Overrides default error handler
+		 * @param {Function} exceptionHandler handling function that takes an
+		 * exception as argument. Must be called before init.
+		 * @returns {void}
+		 */
+		setErrorHandler: function(exceptionHandler) {
+			customErrorHandler = exceptionHandler;
+		},
+
 		/**
 		 * Signals that an error has occurred. If in development mode, an error
 		 * is thrown. If in production mode, an event is fired.

tests/application-test.js

@@ -1097,6 +1097,25 @@ describe('Box.Application', function() {
 
 		});
 
+		describe('setErrorHandler()', function() {
+
+			afterEach(function() {
+				Box.Application.setErrorHandler(undefined);
+			});
+
+			it('should call a custom error handler when one is provided', function() {
+				var customErrorHandler = sandbox.spy();
+				var error = new Error('blah');
+
+				Box.Application.setErrorHandler(customErrorHandler);
+				Box.Application.init();
+				Box.Application.reportError(error);
+
+				assert(customErrorHandler.calledWith(error));
+			});
+
+		});
+
 	});
 
 });