diff --git a/tests/twinkletag.test.js b/tests/twinkletag.test.js
index f890b1126..16f913d55 100644
--- a/tests/twinkletag.test.js
+++ b/tests/twinkletag.test.js
@@ -1,6 +1,13 @@
 describe('modules/twinkletag', () => {
 	describe('checkIncompatible', () => {
-		test('no conflicts', () => {
+		test('no conflicts, 0 tags to check', () => {
+			const incompatibleTags = ['Bad GIF', 'Bad JPEG', 'Bad SVG', 'Bad format'];
+			const tagsToCheck = [];
+			const expected = undefined;
+			expect(Twinkle.tag.checkIncompatible(incompatibleTags, tagsToCheck)).toBe(expected);
+		});
+		
+		test('no conflicts, 1 tag to check', () => {
 			const incompatibleTags = ['Bad GIF', 'Bad JPEG', 'Bad SVG', 'Bad format'];
 			const tagsToCheck = ['Better source requested'];
 			const expected = undefined;