increase test coverage

Co-authored-by: Emily KL <4672118+emilykl@users.noreply.github.com>

Author: emilykl

draftlogs/7997_add.md

@@ -1 +1 @@
-- Add `legend.groupdoubleclick` to set the group behavior for a legend double-click [[#7997](https://github.com/plotly/plotly.js/pull/7997)]
+- Add `legend.groupdoubleclick` to set the group behavior for a legend double-click [[#7997](https://github.com/plotly/plotly.js/pull/7997)], with thanks to @rascal-sl for the contribution!

test/jasmine/tests/legend_test.js

@@ -2539,19 +2539,37 @@ describe('legend interaction', function () {
 
             it('isolates the clicked item instead of its legendgroup', function (done) {
                 Promise.resolve()
+                    .then(assertVisible([false, true, true, true]))
+                    .then(click(0, 2))
+                    .then(assertVisible([false, true, 'legendonly', 'legendonly']))
+                    .then(click(0, 2))
+                    .then(assertVisible([false, true, true, true]))
                     .then(click(1, 2))
                     .then(assertVisible([false, 'legendonly', 'legendonly', true]))
                     .then(click(1, 2))
                     .then(assertVisible([false, true, true, true]))
+                    .then(click(2, 2))
+                    .then(assertVisible([false, 'legendonly', true, 'legendonly']))
+                    .then(click(2, 2))
+                    .then(assertVisible([false, true, true, true]))
                     .then(done, done.fail);
             });
 
             it('leaves the single click behavior to groupclick', function (done) {
                 Promise.resolve()
+                    .then(assertVisible([false, true, true, true]))
+                    .then(click(0))
+                    .then(assertVisible([false, 'legendonly', true, 'legendonly']))
+                    .then(click(0))
+                    .then(assertVisible([false, true, true, true]))
                     .then(click(1))
                     .then(assertVisible([false, 'legendonly', true, 'legendonly']))
                     .then(click(1))
                     .then(assertVisible([false, true, true, true]))
+                    .then(click(2))
+                    .then(assertVisible([false, true, 'legendonly', true]))
+                    .then(click(2))
+                    .then(assertVisible([false, true, true, true]))
                     .then(done, done.fail);
             });
         });