CI: produce JUnit XML from Unity tests for GitHub test reporting

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Co-authored-by: welcor <357770+welcor@users.noreply.github.com>

tests/unity_to_junit.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+"""Convert Unity test-runner output to JUnit XML.
+
+Usage:
+    ./test_binary | python3 unity_to_junit.py <suite_name> <output.xml>
+
+Unity emits one result line per test:
+    path/to/file.c:LINE:TEST_NAME:PASS
+    path/to/file.c:LINE:TEST_NAME:FAIL:message
+    path/to/file.c:LINE:TEST_NAME:IGNORE:message
+followed by a summary line:
+    N Tests N Failures N Ignored
+"""
+
+import re
+import sys
+import xml.etree.ElementTree as ET
+
+
+def parse_unity(lines):
+    tests = []
+    total = failures = ignored = 0
+    for line in lines:
+        line = line.rstrip("\n")
+        m = re.match(
+            r"^.+:\d+:([^:]+):(PASS|FAIL|IGNORE)(?::(.*))?$", line
+        )
+        if m:
+            name, result, message = m.group(1), m.group(2), m.group(3) or ""
+            tests.append((name, result, message))
+            continue
+        m2 = re.match(r"^(\d+) Tests (\d+) Failures (\d+) Ignored", line)
+        if m2:
+            total, failures, ignored = int(m2.group(1)), int(m2.group(2)), int(m2.group(3))
+    if not total:
+        total = len(tests)
+        failures = sum(1 for _, r, _ in tests if r == "FAIL")
+        ignored = sum(1 for _, r, _ in tests if r == "IGNORE")
+    return tests, total, failures, ignored
+
+
+def build_xml(suite_name, tests, total, failures, ignored):
+    suite = ET.Element(
+        "testsuite",
+        name=suite_name,
+        tests=str(total),
+        failures=str(failures),
+        errors="0",
+        skipped=str(ignored),
+    )
+    for name, result, message in tests:
+        case = ET.SubElement(suite, "testcase", name=name, classname=suite_name)
+        if result == "FAIL":
+            f = ET.SubElement(case, "failure", message=message)
+            f.text = message
+        elif result == "IGNORE":
+            ET.SubElement(case, "skipped", message=message)
+    return ET.ElementTree(suite)
+
+
+def main():
+    if len(sys.argv) != 3:
+        print(f"usage: {sys.argv[0]} <suite_name> <output.xml>", file=sys.stderr)
+        sys.exit(1)
+    suite_name, output_file = sys.argv[1], sys.argv[2]
+    tests, total, failures, ignored = parse_unity(sys.stdin.readlines())
+    tree = build_xml(suite_name, tests, total, failures, ignored)
+    ET.indent(tree, space="  ")
+    tree.write(output_file, encoding="unicode", xml_declaration=True)
+
+
+if __name__ == "__main__":
+    main()