AppVeyor is a Windows environment. There are a plethora of reasons why things could be different between it and a personal laptop (Windows build, AMP stack, etc.). So knowing what those environmental differences are would be useful.

@wilsonge did you find that windows laptop that had issues with these tests so we can compare environment details?

This is running

$ php --version
PHP 5.5.15 (cli) (built: Jul 23 2014 15:05:09)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with Xdebug v2.2.3, Copyright (c) 2002-2013, by Derick Rethans

using Windows 10 (64bit)

There were 7 failures:

1) JHtmlBootstrapTest::testEndTabSet
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
 '
 </div>'

C:\Users\georg_000\Documents\Joomla\joomla-cms\tests\unit\suites\libraries\cms\html\JHtmlBootstrapTest.php:584

2) JHtmlBootstrapTest::testEndTab
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
 '
 </div>'

C:\Users\georg_000\Documents\Joomla\joomla-cms\tests\unit\suites\libraries\cms\html\JHtmlBootstrapTest.php:645

3) JToolbarButtonTest::testRender
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
 '<div class="btn-wrapper"  id="toolbar-test">
        <button onclick="if (document.adminForm.boxchecked.value == 0) { alert(Joomla.JText._('JLIB_HTML_PLEASE_MAKE_A_SELECTION_FROM_THE_LIST')); } else { Joomla.submitbutton(''); }" class="btn btn-small">
        <span class="icon-test"></span>
        </button>
 </div>
 '

C:\Users\georg_000\Documents\Joomla\joomla-cms\tests\unit\suites\libraries\cms\toolbar\JToolbarButtonTest.php:135

4) JToolbarButtonConfirmTest::testFetchButton
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
 '<button onclick="if (document.adminForm.boxchecked.value == 0) { alert(Joomla.JText._('JLIB_HTML_PLEASE_MAKE_A_SELECTION_FROM_THE_LIST')); } else { if (confirm('Confirm action?')) { Joomla.submitbutton('article.save'); } }" class="btn btn-small">
        <span class="icon-confirm-test"></span>
        Confirm?</button>
 '

C:\Users\georg_000\Documents\Joomla\joomla-cms\tests\unit\suites\libraries\cms\toolbar\button\JToolbarButtonConfirmTest.php:102

5) JToolbarButtonHelpTest::testFetchButton
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
 '<button onclick="Joomla.popupWindow('help/en-GB/JHELP_CONTENT_ARTICLE_MANAGER.html', 'JHELP', 700, 500, 1)" rel="help" class="btn btn-small">
        <span class="icon-question-sign"></span>
        JTOOLBAR_HELP</button>
 '

C:\Users\georg_000\Documents\Joomla\joomla-cms\tests\unit\suites\libraries\cms\toolbar\button\JToolbarButtonHelpTest.php:104

6) JGithubGistsTest::testCreateGistFromFile
Expectation failed for method name is equal to <string:post> when invoked 1 time(s)
Parameter 1 for invocation JHttp::post('/gists', '{"files":{"gittest":{"content...gist"}', null, null) does not match expected value.
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'{"files":{"gittest":{"content":"GistContent\n"}},"public":true,"description":"This is a gist"}'
+'{"files":{"gittest":{"content":"GistContent\r\n"}},"public":true,"description":"This is a gist"}'

C:\Users\georg_000\Documents\Joomla\joomla-cms\libraries\joomla\github\package\gists.php:57
C:\Users\georg_000\Documents\Joomla\joomla-cms\tests\unit\suites\libraries\joomla\github\JGithubGistsTest.php:165

7) JGithubPackageGistsTest::testCreateGistFromFile
Expectation failed for method name is equal to <string:post> when invoked 1 time(s)
Parameter 1 for invocation JHttp::post('/gists', '{"files":{"gittest":{"content...gist"}', null, null) does not match expected value.
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'{"files":{"gittest":{"content":"GistContent\n"}},"public":true,"description":"This is a gist"}'
+'{"files":{"gittest":{"content":"GistContent\r\n"}},"public":true,"description":"This is a gist"}'

C:\Users\georg_000\Documents\Joomla\joomla-cms\libraries\joomla\github\package\gists.php:57
C:\Users\georg_000\Documents\Joomla\joomla-cms\tests\unit\suites\libraries\joomla\github\JGithubPackageGistsTest.php:161

@wilsonge @photodude Is this still an issue or has it been resolved

I don't use the windows laptop regularly (and I don't have access to it for the next week) but I have no reason to believe the situation has changed

Been nearly a year and with no further updates etc I am closing this.