Add error annotations for test failures and errors

Author: Donnerbart

integration-test/reports/TEST-de.donnerbart.example.DeletedTest.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<testsuite name="de.donnerbart.example.DeletedTest" tests="1" skipped="0" failures="0" errors="0"
+<testsuite name="de.donnerbart.example.DeletedTest" tests="1" skipped="0" failures="1" errors="0"
            timestamp="2025-01-01T00:00:00" hostname="example" time="2.374">
     <properties/>
     <testcase name="testDeletedMethod()"

integration-test/reports/TEST-de.donnerbart.example.SlowestTest.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<testsuite name="de.donnerbart.example.SlowestTest" tests="1" skipped="0" failures="0" errors="0"
+<testsuite name="de.donnerbart.example.SlowestTest" tests="1" skipped="0" failures="0" errors="1"
            timestamp="2025-01-01T00:00:00" hostname="example" time="153.457">
     <properties/>
     <testcase name="testFastMethod()"

merge-junit-reports/action.yml

@@ -99,6 +99,17 @@ runs:
       shell: bash
       run: cp junit-reports-artifact/*.xml junit-reports/
 
+    - name: Report failed tests
+      shell: bash
+      working-directory: junit-reports
+      run: |
+        find . -name "*.xml" | while read -r REPORT; do
+          xmlstarlet sel -t \
+          -m "//testsuite[@failures > 0 or @errors > 0]" \
+          -v "concat('::error file=', '$file', ',line=1,title=', @name, '::Test suite failed: ', @failures, ' failure(s), ', @errors, ' error(s)')" -n \
+          "$REPORT"
+        done
+
     - name: Update JUnit reports
       uses: EndBug/add-and-commit@a94899bca583c204427a224a7af87c02f9b325d5 # v9
       with: