Qunit test alternates between pass and fail on page refresh

I have a two tests that are causing side effects with each other. I understand why as I am replacing a jQuery built-in function that is being called internally in the second test. However what I don't understand is why the test alternately passes and fails.

This question is similar However, I am not doing anything directly on the qunit-fixture div.

Here are my tests

test('always passing test', function() { // Always passes
    var panelId = '#PanelMyTab';

    var event = {};
    var ui = {
        tab: {
            name: 'MyTab',
        },
        panel: panelId,
    };

    $('<div id="' + panelId + '">')
        .append('<a href="#" class="export">Test</a>')
        .append('<a href="#" class="showForm">Show Form</a>')
        .appendTo('#qunit-fixture');

    jQuery.fn.on = function(event, callback) {
        ok(this.selector == panelId + ' .export', 'Setting export click event');
        equal(callback, tickets.search.getReport, 'Callback being set');
    };

    loadTab(event, ui);
});

test('alternately passing and failing', function() { // Alternates between passing and failing on page refresh
    expect(5);

    var testUrl = 'test';
    $('<div class="ui-tabs-panel">')
        .append('<a href="'+ testUrl + '" id="getReport">Get Report</a>')
        .append('<form action="notest" target="" class="ticketSearch"></form>')
        .appendTo('#qunit-fixture');

    // Setup form mocking
    $('form.ticketSearch').submit(function() {
        var urlPattern = new RegExp(testUrl + '$');
        ok(urlPattern.test($(this).prop('action')), 'Form action set to link href');
        equal($(this).prop('target'), '_blank', 'Open form on a new page');
    });

    var event = {
        target: 'a#getReport',
    };

    var result = getReport(