Add test support for Debian 13 (Trixie)

Adds test resources and test case for Debian 13 "Trixie", the current
stable release as of 2025. Includes os-release, debian_version, and
lsb_release script for proper distribution identification.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: nir0s

tests/resources/distros/debian13/bin/lsb_release

@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+# lsb_release command for testing the ld module.
+# Only the -a option is supported.
+#
+# This version of the lsb_release command works without a corresponding
+# etc/lsb-release file.
+#
+
+if [[ "$@" != "-a" ]]; then
+  echo "Usage: lsb_release -a"
+  exit 2
+fi
+
+echo "No LSB modules are available."
+echo "Distributor ID:	Debian"
+echo "Description:	Debian GNU/Linux 13 (trixie)"
+echo "Release:	13"
+echo "Codename:	trixie"
+
+exit 0

tests/resources/distros/debian13/etc/debian_version

@@ -0,0 +1 @@
+13.1

tests/resources/distros/debian13/etc/os-release

@@ -0,0 +1,10 @@
+PRETTY_NAME="Debian GNU/Linux 13 (trixie)"
+NAME="Debian GNU/Linux"
+VERSION_ID="13"
+VERSION="13 (trixie)"
+VERSION_CODENAME=trixie
+DEBIAN_VERSION_FULL=13.1
+ID=debian
+HOME_URL="https://www.debian.org/"
+SUPPORT_URL="https://www.debian.org/support"
+BUG_REPORT_URL="https://bugs.debian.org/"

tests/test_distro.py

@@ -233,6 +233,18 @@ def test_debian10_os_release(self) -> None:
         }
         self._test_outcome(desired_outcome)
 
+    def test_debian13_os_release(self) -> None:
+        desired_outcome = {
+            "id": "debian",
+            "name": "Debian GNU/Linux",
+            "pretty_name": "Debian GNU/Linux 13 (trixie)",
+            "version": "13",
+            "pretty_version": "13 (trixie)",
+            "best_version": "13.1",
+            "codename": "trixie",
+        }
+        self._test_outcome(desired_outcome)
+
     def test_debiantesting_os_release(self) -> None:
         desired_outcome = {
             "id": "debian",
@@ -1341,6 +1353,20 @@ def test_debian10_release(self) -> None:
         self._test_outcome(desired_outcome)
         self._test_non_existing_release_file()
 
+    def test_debian13_release(self) -> None:
+        desired_outcome = {
+            "id": "debian",
+            "name": "Debian GNU/Linux",
+            "pretty_name": "Debian GNU/Linux 13 (trixie)",
+            "version": "13",
+            "pretty_version": "13 (trixie)",
+            "best_version": "13.1",
+            "codename": "trixie",
+            "major_version": "13",
+        }
+        self._test_outcome(desired_outcome)
+        self._test_non_existing_release_file()
+
     def test_debiantesting_release(self) -> None:
         desired_outcome = {
             "id": "debian",