Avoid duplicating system-out and system-error tags

Author: zupermanzupereroe

src/_pytest/junitxml.py

@@ -591,7 +591,8 @@ def pytest_runtest_logreport(self, report):
             if report.when == "call":
                 reporter.append_failure(report)
                 self.open_reports.append(report)
-                reporter.write_captured_output(report)
+                if not self.log_passing_tests:
+                    reporter.write_captured_output(report)
             else:
                 reporter.append_error(report)
         elif report.skipped: