Install css style tests again

Reinstate the installed tests for css style.

testsuite/css/style/meson.build

@@ -1,3 +1,6 @@
+gtk_libexecdir = join_paths(gtk_prefix, get_option('libexecdir'))
+testdatadir = join_paths(gtk_datadir, 'installed-tests/gtk4')
+testexecdir = join_paths(gtk_libexecdir, 'installed-tests/gtk4/css/style')
 
 cssresources = gnome.compile_resources(
   'cssresources',
@@ -9,6 +12,49 @@ test_style = executable(
   'test-css-style',
   'test-css-style.c',
   cssresources,
+  install: get_option('install-tests'),
+  install_dir: testexecdir,
   dependencies: libgtk_dep,
 )
 test('css/style/test-style', test_style)
+
+test_data = [
+  'adjacent-states.css',
+  'adjacent-states.nodes',
+  'adjacent-states.ui',
+  'colornames.css',
+  'colornames.nodes',
+  'colornames.ui',
+  'currentcolor.css',
+  'currentcolor.nodes',
+  'currentcolor.ui',
+  'font.css',
+  'font.nodes',
+  'font.ui',
+  'gradient.css',
+  'gradient.nodes',
+  'gradient.ui',
+  'gtk.css',
+  'inherit.css',
+  'inherit.nodes',
+  'inherit.ui',
+  'label.css',
+  'label.nodes',
+  'label.ui',
+  'nth-child.css',
+  'nth-child.nodes',
+  'nth-child.ui',
+]
+
+if get_option('install-tests')
+  conf = configuration_data()
+  conf.set('libexecdir', gtk_libexecdir)
+  configure_file(input: 'test-css-style.test.in',
+                 output: 'test-css-style.test',
+                 configuration: conf,
+                 install_dir: testdatadir)
+
+  install_data(test_data, install_dir: testexecdir)
+
+endif
+