Add hostname and timestamp to JUnit XML testsuite tag

Fix #5471

changelog/5471.trivial.rst

@@ -0,0 +1 @@
+JUnit XML now includes a timestamp and hostname in the testsuite tag.

src/_pytest/junitxml.py

@@ -10,9 +10,11 @@ src/main/resources/org/jenkinsci/plugins/xunit/types/model/xsd/junit-10.xsd
 """
 import functools
 import os
+import platform
 import re
 import sys
 import time
+from datetime import datetime
 
 import py
 
@@ -666,6 +668,8 @@ class LogXML:
             skipped=self.stats["skipped"],
             tests=numtests,
             time="%.3f" % suite_time_delta,
+            timestamp=datetime.fromtimestamp(self.suite_start_time).isoformat(),
+            hostname=platform.node(),
         )
         logfile.write(Junit.testsuites([suite_node]).unicode(indent=0))
         logfile.close()

testing/test_junitxml.py

@@ -1,4 +1,6 @@
 import os
+import platform
+from datetime import datetime
 from xml.dom import minidom
 
 import py
@@ -139,6 +141,30 @@ class TestPython:
         node = dom.find_first_by_tag("testsuite")
         node.assert_attr(name="pytest", errors=1, failures=2, skipped=1, tests=5)
 
+    def test_hostname_in_xml(self, testdir):
+        testdir.makepyfile(
+            """
+            def test_pass():
+                pass
+        """
+        )
+        result, dom = runandparse(testdir)
+        node = dom.find_first_by_tag("testsuite")
+        node.assert_attr(hostname=platform.node())
+
+    def test_timestamp_in_xml(self, testdir):
+        testdir.makepyfile(
+            """
+            def test_pass():
+                pass
+        """
+        )
+        start_time = datetime.now()
+        result, dom = runandparse(testdir)
+        node = dom.find_first_by_tag("testsuite")
+        timestamp = datetime.strptime(node["timestamp"], "%Y-%m-%dT%H:%M:%S.%f")
+        assert start_time <= timestamp < datetime.now()
+
     def test_timing_function(self, testdir):
         testdir.makepyfile(
             """