tests: add Mageia 5 detection test

Reviewed-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Pino Toscano <ptoscano@redhat.com>

tests/data/urldetect/mageia/5/VERSION

@@ -0,0 +1 @@
+Mageia 5 Official-x86_64-Download 20180807 23:39

tests/test_urldetect.py

@@ -130,6 +130,7 @@ def test_suse():
 
 
 def test_mageia():
+    _test("mageia/5", "mageia5", initrd="all.rdz")
     _test("mageia/8", initrd="all.rdz")
 
 

virtinst/install/urldetect.py

@@ -796,9 +796,9 @@ class _MageiaDistro(_DistroTree):
             if not content:
                 return False
 
-            m = re.match("^Mageia (\d+) .*", content)
+            m = re.match(r"^Mageia (\d+) .*", content)
             if not m:
-                return False
+                return False  # pragma: no cover
 
             cache.mageia_version = m.group(1)