[gnome-font-viewer/wip/cdavis/validate-appdata] data: Add test to validate appdata

[Christopher Davis <christopherdavis src gnome org>]

commit a31593140f098764bb48d1a4706b1befb8f5a135
Author: Christopher Davis <christopherdavis gnome org>
Date:   Sat Feb 13 21:51:55 2021 -0800

    data: Add test to validate appdata

 data/meson.build | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/data/meson.build b/data/meson.build
index b843a01..bfc9caa 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -1,6 +1,6 @@
 appdatadir = join_paths(datadir, 'metainfo')
 appdata_file = 'org.gnome.font-viewer.appdata.xml'
-i18n.merge_file(appdata_file,
+merged_appdata = i18n.merge_file(appdata_file,
   input: appdata_file + '.in',
   output: appdata_file,
   po_dir: '../po',
@@ -8,4 +8,14 @@ i18n.merge_file(appdata_file,
   install_dir: appdatadir
 )
 
+appstream_util = find_program('appstream-util', required: false)
+if appstream_util.found()
+  test(
+    'validate-appdata', appstream_util,
+    args: [
+      'validate-relax', '--nonet', merged_appdata.full_path()
+    ]
+  )
+endif
+
 subdir('icons')