From 27e67372b298a4db69e3f4f4daf15bf66b70a091 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Skytt=C3=A4?= <ville.skytta@iki.fi>
Date: Sat, 26 Dec 2020 18:01:29 +0200
Subject: tests/test_sub_class_ofs.py: new sub-class-of sanity check test

---
 tests/meson.build           |  5 +++++
 tests/test_sub_class_ofs.py | 46 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100755 tests/test_sub_class_ofs.py

diff --git a/tests/meson.build b/tests/meson.build
index 3b01da17..7ee6559c 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -37,6 +37,11 @@ test('No duplicate mime-types',
     args: freedesktop_org_xml,
 )
 
+test('Sanity check sub-class-of',
+    find_program('test_sub_class_ofs.py'),
+    args: freedesktop_org_xml,
+)
+
 test('xmllint freedesktop.org.xml',
     xmllint,
     args: [ '--noout', '--valid', freedesktop_org_xml, ],
diff --git a/tests/test_sub_class_ofs.py b/tests/test_sub_class_ofs.py
new file mode 100755
index 00000000..2a48aec1
--- /dev/null
+++ b/tests/test_sub_class_ofs.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+
+import sys
+import xml.etree.ElementTree as ET
+
+FDO_XMLNS = "{http://www.freedesktop.org/standards/shared-mime-info}"
+
+
+def test_sub_class_ofs(fdo_xml: str) -> int:
+
+    with open(fdo_xml, "rb") as f:
+        tree = ET.parse(f)
+
+    errors = 0
+
+    mime_types = set()
+    sub_class_ofs = set()
+    for elem in tree.findall(f"{FDO_XMLNS}mime-type"):
+        mime_type = elem.attrib["type"]
+        mime_types.add(mime_type)
+        for elem in elem.findall(f"{FDO_XMLNS}sub-class-of"):
+            sub_class_of = elem.attrib["type"]
+
+            if mime_type == sub_class_of:
+                print(f"{fdo_xml}: type {mime_type} is sub-class-of itself",
+                      file=sys.stderr)
+                errors += 1
+
+            sub_class_ofs.add(sub_class_of)
+
+    assert mime_types and sub_class_ofs
+
+    for not_found in sub_class_ofs - mime_types:
+        print(f"{fdo_xml}: parent sub-class-of type {not_found} not found",
+              file=sys.stderr)
+        errors += 1
+
+    return errors
+
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print(f"Usage: {__file__} FREEDESKTOP_ORG_XML", file=sys.stderr)
+        sys.exit(2)
+
+    sys.exit(test_sub_class_ofs(sys.argv[1]) and 1 or 0)
-- 
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