[gtk/gir-test] Add a gir test

[Matthias Clasen <matthiasc src gnome org>]

commit 31267f1c4865674ed3c87f24eb266703998a21c5
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jan 15 22:14:04 2021 -0500

    Add a gir test
    
    This test doesn't test much, but it loads Gtk-4.0.gir
    from python and creates a window, just to see that things
    work.

 testsuite/gtk/meson.build | 15 +++++++++------
 testsuite/gtk/testgir     |  2 +-
 2 files changed, 10 insertions(+), 7 deletions(-)
---
diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index e578611c0b..31cc5a2e04 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -268,13 +268,16 @@ foreach test : focus_chain_tests
   )
 endforeach
 
-if get_option('introspection').enabled()
+if build_gir
+  python = find_program ('python3')
   env = environment()
-  env.set('LD_LIBRARY_PATH', meson.project_build_root() + '/gtk')
-  env.set('GI_TYPELIB_DIR', meson.project_build_root() + '/gtk')
-  test('testgir',
-        env: env)
-fi
+  env.set('LD_LIBRARY_PATH', join_paths(meson.build_root(), 'gtk'))
+  env.set('GI_TYPELIB_DIR', join_paths(meson.build_root(), 'gtk'))
+  test('testgir', python,
+       args: [ join_paths(meson.current_source_dir(), 'testgir') ],
+       env: env,
+       suite: [ 'gtk', 'gir' ])
+endif
 
 if get_option('install-tests')
   foreach t : tests
diff --git a/testsuite/gtk/testgir b/testsuite/gtk/testgir
index 42355aa59b..b3e494c00e 100644
--- a/testsuite/gtk/testgir
+++ b/testsuite/gtk/testgir
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#! /usr/bin/python3
 
 import gi
 gi.require_version('Gtk', '4.0')