https://github.com/jenkinsci/xcode-plugin/blob/master/src/main/java/au/com/rayh/XCodeBuildOutputParser.java

The following patterns are invalid with the new Xcode build system that allows for parallel execution of iOS text cases

Pattern START_SUITE = Pattern.compile("Test Suite '([^/].+)'.*started at\\s+(.*)");
Pattern END_SUITE = Pattern.compile("Test Suite '([^/].+)'.*\\S+ at\\s+(.*).");
Pattern START_TESTCASE = Pattern.compile("Test Case '-\\[\\S+\\s+(\\S+)\\]' started.");
Pattern END_TESTCASE = Pattern.compile("Test Case '-\\[\\S+\\s+(\\S+)\\]' passed \\((.*) seconds\\).");

Here's a sample of the new output:

16:51:22 Test suite 'MyTests' started on 'Clone 3 of iPhone 8 - MyApp.app (78101)'
16:51:22 Test case 'MyClassTests.testBasic()' passed on 'Clone 3 of iPhone 8 - MyApp.app (78101)' (0.001 seconds)
16:51:22 Test case 'MyClassTests.testComplicated()' passed on 'Clone 1 of iPhone 8 - MyApp.app (77847)' (3.713 seconds)
16:51:22 Test case 'MyClassTests.testUncomplicated()' passed on 'Clone 1 of iPhone 8 - MyApp.app (77847)' (0.014 seconds)