Our version of shared-mime-info differs for the AppImage MIME type.

--- kfilemetadata-5.65.0/autotests/extractorcoveragetest.cpp.old	2019-12-12 22:37:05.000000000 +0000
+++ kfilemetadata-5.65.0/autotests/extractorcoveragetest.cpp	2019-12-29 15:56:30.981925832 +0000
@@ -36,7 +36,7 @@
         m_knownFiles = {
             { "test.aif",                      "audio/x-aifc"},
             { "test.ape",                      "audio/x-ape"},
-            { "test.AppImage",                 "application/vnd.appimage"},
+            { "test.AppImage",                 "application/x-iso9660-appimage"},
             { "test_apple_systemprofiler.spx", "application/x-apple-systemprofiler+xml"},  // s-m-i < 2.0 would give "application/xml"
             { "test.dot",                      "text/vnd.graphviz"},
             { "test.eps",                      "image/x-eps"},