diff --git a/test/tests/feedItemTest.js b/test/tests/feedItemTest.js
index 01c1f96456..d472c67f3a 100644
--- a/test/tests/feedItemTest.js
+++ b/test/tests/feedItemTest.js
@@ -128,12 +128,12 @@ describe("Zotero.FeedItem", function () {
 		it("should require feed being set", function* () {
 			let feedItem = new Zotero.FeedItem('book', { guid: Zotero.randomString() });
 			// Defaults to user library ID
-			yield assert.isRejected(feedItem.saveTx(), /^Error: Cannot add /);
+			yield assert.isRejected(feedItem.saveTx(), /^Cannot add /);
 		});
 		it("should require GUID being set", function* () {
 			let feedItem = new Zotero.FeedItem('book');
 			feedItem.libraryID = feed.libraryID;
-			yield assert.isRejected(feedItem.saveTx(),  /^Error: GUID must be set before saving FeedItem$/);
+			yield assert.isRejected(feedItem.saveTx(),  /^GUID must be set before saving FeedItem$/);
 		});
 		it("should require a unique GUID", function* () {
 			let guid = Zotero.randomString();
@@ -149,7 +149,7 @@ describe("Zotero.FeedItem", function () {
 		it("should require item type being set", function* () {
 			let feedItem = new Zotero.FeedItem(null, { guid: Zotero.randomString() });
 			feedItem.libraryID = feed.libraryID;
-			yield assert.isRejected(feedItem.saveTx(),  /^Error: Item type must be set before saving$/);
+			yield assert.isRejected(feedItem.saveTx(),  /^Item type must be set before saving$/);
 		});
 		it("should save feed item", function* () {
 			let guid = Zotero.randomString();
diff --git a/test/tests/feedTest.js b/test/tests/feedTest.js
index 516e39f111..41d79ecae0 100644
--- a/test/tests/feedTest.js
+++ b/test/tests/feedTest.js
@@ -12,7 +12,7 @@ describe("Zotero.Feed", function() {
 	describe("#constructor()", function() {
 		it("should accept required fields as arguments", function* () {
 			let feed = new Zotero.Feed();
-			yield assert.isRejected(feed.saveTx(), /^Error: Feed name not set$/);
+			yield assert.isRejected(feed.saveTx(), /^Feed name not set$/);
 			
 			feed = new Zotero.Feed({
 				name: 'Test ' + Zotero.randomString(),
@@ -93,28 +93,28 @@ describe("Zotero.Feed", function() {
 		});
 		it("should throw if name or url are missing", function *() {
 			let feed = new Zotero.Feed();
-			yield assert.isRejected(feed.saveTx(), /^Error: Feed name not set$/);
+			yield assert.isRejected(feed.saveTx(), /^Feed name not set$/);
 			
 			feed.name = 'Test ' + Zotero.randomString();
-			yield assert.isRejected(feed.saveTx(), /^Error: Feed URL not set$/);
+			yield assert.isRejected(feed.saveTx(), /^Feed URL not set$/);
 			
 			feed = new Zotero.Feed();
 			feed.url = 'http://' + Zotero.randomString() + '.com';
-			yield assert.isRejected(feed.saveTx(), /^Error: Feed name not set$/);
+			yield assert.isRejected(feed.saveTx(), /^Feed name not set$/);
 		});
 		it("should not allow saving a feed with the same url", function *() {
 			let url = 'http://' + Zotero.randomString() + '.com';
 			let feed1 = yield createFeed({ url });
 			
 			let feed2 = new Zotero.Feed({ name: 'Test ' + Zotero.randomString(), url });
-			yield assert.isRejected(feed2.saveTx(), /^Error: Feed for URL already exists: /);
+			yield assert.isRejected(feed2.saveTx(), /^Feed for URL already exists: /);
 			
 			// Perform check with normalized URL
 			feed2.url = url + '/';
-			yield assert.isRejected(feed2.saveTx(), /^Error: Feed for URL already exists: /);
+			yield assert.isRejected(feed2.saveTx(), /^Feed for URL already exists: /);
 			
 			feed2.url = url.toUpperCase();
-			yield assert.isRejected(feed2.saveTx(), /^Error: Feed for URL already exists: /);
+			yield assert.isRejected(feed2.saveTx(), /^Feed for URL already exists: /);
 		});
 		it("should allow saving a feed with the same name", function *() {
 			let name = 'Test ' + Zotero.randomString();
@@ -405,11 +405,11 @@ describe("Zotero.Feed", function() {
 		})
 		it("should not allow adding collections", function* () {
 			let collection = new Zotero.Collection({ name: 'test', libraryID: feed.libraryID });
-			yield assert.isRejected(collection.saveTx({ skipEditCheck: true }), /^Error: Cannot add /);
+			yield assert.isRejected(collection.saveTx({ skipEditCheck: true }), /^Cannot add /);
 		});
 		it("should not allow adding saved search", function* () {
 			let search = new Zotero.Search({ name: 'test', libraryID: feed.libraryID });
-			yield assert.isRejected(search.saveTx({ skipEditCheck: true }), /^Error: Cannot add /);
+			yield assert.isRejected(search.saveTx({ skipEditCheck: true }), /^Cannot add /);
 		});
 		it("should allow adding feed item", function* () {
 			let feedItem = new Zotero.FeedItem('book', { guid: Zotero.randomString() });
diff --git a/test/tests/librariesTest.js b/test/tests/librariesTest.js
index b55cf18aed..2a8bfccfd4 100644
--- a/test/tests/librariesTest.js
+++ b/test/tests/librariesTest.js
@@ -146,7 +146,7 @@ describe("Zotero.Libraries", function() {
 			assert.equal(Zotero.Libraries.isEditable(group.libraryID), startState, 'reverts state');
 		});
 		it("should throw for invalid library ID", function() {
-			return assert.isRejected(Zotero.Libraries.setEditable(-1), /^Error: Invalid library ID /);
+			return assert.isRejected(Zotero.Libraries.setEditable(-1), /^Invalid library ID /);
 		});
 	});
 	describe("#isFilesEditable()", function() {
@@ -176,7 +176,7 @@ describe("Zotero.Libraries", function() {
 			yield Zotero.Libraries.setEditable(group.libraryID, editableStartState);
 		});
 		it("should throw for invalid library ID", function* () {
-			return assert.isRejected(Zotero.Libraries.setFilesEditable(-1), /^Error: Invalid library ID /);
+			return assert.isRejected(Zotero.Libraries.setFilesEditable(-1), /^Invalid library ID /);
 		});
 	});
 	describe("#isGroupLibrary()", function() {
diff --git a/test/tests/libraryTest.js b/test/tests/libraryTest.js
index 9cc89af646..a455728ffa 100644
--- a/test/tests/libraryTest.js
+++ b/test/tests/libraryTest.js
@@ -157,7 +157,7 @@ describe("Zotero.Library", function() {
 	describe("#save()", function() {
 		it("should require mandatory parameters to be set", function* () {
 			let library = new Zotero.Library({ editable: true, filesEditable: true });
-			yield assert.isRejected(library.saveTx(), /^Error: libraryType must be set before saving/, 'libraryType is mandatory');
+			yield assert.isRejected(library.saveTx(), /^libraryType must be set before saving/, 'libraryType is mandatory');
 			
 			// Required group params
 			let groupID = Zotero.Utilities.rand(1000, 10000);
@@ -165,10 +165,10 @@ describe("Zotero.Library", function() {
 			let description = '';
 			let version = Zotero.Utilities.rand(1000, 10000);
 			library = new Zotero.Group({ filesEditable: true, groupID, name , description, version });
-			yield assert.isRejected(library.saveTx(), /^Error: editable must be set before saving/, 'editable is mandatory');
+			yield assert.isRejected(library.saveTx(), /^editable must be set before saving/, 'editable is mandatory');
 			
 			library = new Zotero.Group({ editable: true, groupID, name , description, version });
-			yield assert.isRejected(library.saveTx(), /^Error: filesEditable must be set before saving/, 'filesEditable is mandatory');
+			yield assert.isRejected(library.saveTx(), /^filesEditable must be set before saving/, 'filesEditable is mandatory');
 			
 			library = new Zotero.Group({ editable: true, filesEditable: true, groupID, name , description, version });
 			yield assert.isFulfilled(library.saveTx());
@@ -217,7 +217,7 @@ describe("Zotero.Library", function() {
 		
 		it("should not allow erasing permanent libraries", function* () {
 			let library = Zotero.Libraries.get(Zotero.Libraries.userLibraryID);
-			yield assert.isRejected(library.eraseTx(), /^Error: Cannot erase library of type 'user'$/, "does not allow erasing user library");
+			yield assert.isRejected(library.eraseTx(), /^Cannot erase library of type 'user'$/, "does not allow erasing user library");
 		});
 		
 		it("should not allow erasing unsaved libraries", function* () {