Viewing Failed Tests
Examine failed tests to begin determining the source of issues.
Click the Failed Test button () at the bottom of the test navigator.
A list of failed-test methods is displayed, with a test indicator icon denoting failure (a red diamond with an x) next to the name of each method that failed.
Select a failed method to examine it in the editor.
After addressing the reason for the failure, click the failed-test indicator to rerun the test.