Run notifier observers in tests after all others

This ensures that main functionality will have already run if a test
waits on the same event.

chrome/content/zotero/xpcom/notifier.js

@@ -236,7 +236,7 @@ Zotero.Notifier = new function(){
 	
 	/**
 	 * Get order of observer by priority, with lower numbers having higher priority.
-	 * If an observer doesn't have a priority, sort it last.
+	 * If an observer doesn't have a priority, default to 100.
 	 */
 	function _getObserverOrder(type) {
 		var order = [];
@@ -247,7 +247,7 @@ Zotero.Notifier = new function(){
 			}
 			order.push({
 				id: i,
-				priority: _observers[i].priority || false
+				priority: _observers[i].priority || 100
 			});
 		}
 		order.sort((a, b) => {

test/content/support.js

@@ -249,6 +249,8 @@ function waitForItemEvent(event) {
 
 /**
  * Wait for a single notifier event and return a promise for the data
+ *
+ * Tests run after all other handlers (priority 101, since handlers are 100 by default)
  */
 function waitForNotifierEvent(event, type) {
 	if (!event) throw new Error("event not provided");
@@ -262,7 +264,7 @@ function waitForNotifierEvent(event, type) {
 				extraData: extraData
 			});
 		}
-	}}, [type]);
+	}}, [type], 'test', 101);
 	return deferred.promise;
 }