Convert JUnit XML from pytest into Automake .trs files

It's important to parse the JUnit result file rather than relying on the
exit code from pytest, which has a different meaning. Include a .trs test
result for each test case and set an exit code which is most appropriate
as the aggregate result (e.g. it will be set to 77 (SKIP) if there's at
least one test case that was skipped).

bin/tests/system/convert-junit-to-trs.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# Convert JUnit pytest output to automake .trs files
+
+import argparse
+import sys
+from xml.etree import ElementTree
+
+
+def junit_to_trs(junit_xml):
+    root = ElementTree.fromstring(junit_xml)
+    testcases = root.findall("./testsuite/testcase")
+
+    if len(testcases) < 1:
+        print(":test-result: ERROR convert-junit-to-trs.py")
+        return 99
+
+    has_fail = False
+    has_error = False
+    has_skipped = False
+    for testcase in testcases:
+        filename = f"{testcase.attrib['classname'].replace('.', '/')}.py"
+        name = f"{filename}::{testcase.attrib['name']}"
+        res = "PASS"
+        for node in testcase:
+            if node.tag == "failure":
+                res = "FAIL"
+                has_fail = True
+            elif node.tag == "error":
+                res = "ERROR"
+                has_error = True
+            elif node.tag == "skipped":
+                if node.attrib["type"] == "pytest.xfail":
+                    res = "XFAIL"
+                else:
+                    res = "SKIP"
+                    has_skipped = True
+        print(f":test-result: {res} {name}")
+
+    if has_error:
+        return 99
+    if has_fail:
+        return 1
+    if has_skipped:
+        return 77
+    return 0
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Convert JUnit XML to Automake TRS and exit with "
+        "the appropriate Automake-compatible exit code."
+    )
+    parser.add_argument(
+        "junit_file",
+        type=argparse.FileType("r", encoding="utf-8"),
+        help="junit xml result file",
+    )
+    args = parser.parse_args()
+
+    junit_xml = args.junit_file.read()
+    sys.exit(junit_to_trs(junit_xml))
+
+
+if __name__ == "__main__":
+    main()