MockInteractions tap() does not work when window is not focused.

[btolsch]

Normally, the following works fine when our tests spawn a browser window and nothing causes the window to lose focus.

MockInteractions.tap(checkboxElement);

Afterwards, checkboxElement.checked has successfully changed state. However, if something causes the test window to lose focus, checkboxElement.checked will be unchanged after the tap().

[valdrinkoshi]

You could use document.hasFocus() to verify that https://developer.mozilla.org/en-US/docs/Web/API/Document/hasFocus
Something similar was happening to me in Firefox, where the focus stayed on the searchbar; I got the focus back to the document using window.focus().
I don't think this is a problem that the tap method can/should solve.