Tip: A Windows app may run flawlessly during development and testing, but after submitting it for certification testing, the app may crash or perform unexpectedly. Along these same lines, your app may not perform as expected after publication. This resource, http://support.microsoft.com/kb/2859130, explains the most common reasons for this along with remedies.
The app's core functions are not testable.
Steps to Reproduce:
Tip: A Windows app may run flawlessly during development and testing, but after submitting it for certification testing, the app may crash or perform unexpectedly. Along these same lines, your app may not perform as expected after publication. This resource, http://support.microsoft.com/kb/2859130, explains the most common reasons for this along with remedies.
https://dev.windows.com/en-us/dashboard/File/CertReport?appId=9NBLGGH1K4SM&certReportFileId=1152921504676488336