Fixed a bug where stdout and stderr were logged twice by junitxml.

_pytest/junitxml.py

@@ -224,7 +224,7 @@ class _NodeReporter(object):
                 Junit.skipped("%s:%s: %s" % (filename, lineno, skipreason),
                               type="pytest.skip",
                               message=skipreason))
-        self.write_captured_output(report)
+            self.write_captured_output(report)
 
     def finalize(self):
         data = self.to_xml().unicode(indent=0)

changelog/3491.bugfix.rst

@@ -0,0 +1 @@
+Fixed a bug where stdout and stderr were logged twice by junitxml.

testing/test_junitxml.py

@@ -458,6 +458,23 @@ class TestPython(object):
         fnode.assert_attr(message="expected test failure")
         # assert "ValueError" in fnode.toxml()
 
+    def test_xfail_captures_output_once(self, testdir):
+        testdir.makepyfile("""
+            import sys
+            import pytest
+
+            @pytest.mark.xfail()
+            def test_fail():
+                sys.stdout.write('XFAIL This is stdout')
+                sys.stderr.write('XFAIL This is stderr')
+                assert 0
+        """)
+        result, dom = runandparse(testdir)
+        node = dom.find_first_by_tag("testsuite")
+        tnode = node.find_first_by_tag("testcase")
+        assert len(tnode.find_by_tag('system-err')) == 1
+        assert len(tnode.find_by_tag('system-out')) == 1
+    
     def test_xfailure_xpass(self, testdir):
         testdir.makepyfile("""
             import pytest