diff --git a/test/jasmine/tests/localize_test.js b/test/jasmine/tests/localize_test.js
index 2635411d512..65394e6ef11 100644
--- a/test/jasmine/tests/localize_test.js
+++ b/test/jasmine/tests/localize_test.js
@@ -219,6 +219,16 @@ describe('localization', function() {
         })
         .then(function() {
             expect(firstYLabel()).toBe('0p5');
+
+            return Plotly.relayout(gd, {'yaxis.tickformat': '.3f'});
+        })
+        .then(function() {
+            expect(firstYLabel()).toBe('0p500');
+
+            return Plotly.relayout(gd, {separators: null});
+        })
+        .then(function() {
+            expect(firstYLabel()).toBe('0D500');
         })
         .catch(failTest)
         .then(done);