build: Add option to turn off tests

St's theme test now requires the libmutter-test library, which is only
built when tests are enabled. Instead of mandating a particular build
configuration in mutter, add a corresponding option in gnome-shell as
well.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1975>

meson.build

@@ -88,7 +88,6 @@ clutter_dep = dependency(clutter_pc, version: mutter_req)
 cogl_dep = dependency(cogl_pc, version: mutter_req)
 cogl_pango_dep = dependency(cogl_pango_pc, version: mutter_req)
 mutter_dep = dependency(libmutter_pc, version: mutter_req)
-mutter_test_dep = dependency(libmutter_test_pc, version: mutter_req)
 polkit_dep = dependency('polkit-agent-1', version: polkit_req)
 startup_dep = dependency('libstartup-notification-1.0', version: startup_req)
 ibus_dep = dependency('ibus-1.0', version: ibus_req)
@@ -288,9 +287,12 @@ subdir('js')
 subdir('src')
 subdir('po')
 subdir('data')
-subdir('tests')
 subdir('tools')
 
+if get_option('tests')
+  subdir('tests')
+endif
+
 if get_option('gtk_doc')
   subdir('docs/reference')
 endif

meson_options.txt

@@ -22,6 +22,12 @@ option('man',
   description: 'Generate man pages'
 )
 
+option('tests',
+  type: 'boolean',
+  value: true,
+  description: 'Enable tests'
+)
+
 option('networkmanager',
   type: 'boolean',
   value: true,

src/st/meson.build

@@ -191,6 +191,8 @@ libst_dep = declare_dependency(link_with: libst,
   sources: st_enums[1]
 )
 
+if get_option('tests')
+  mutter_test_dep = dependency(libmutter_test_pc, version: mutter_req)
   test_theme = executable('test-theme',
     sources: 'test-theme.c',
     c_args: st_cflags,
@@ -202,6 +204,7 @@ test_theme = executable('test-theme',
   test('CSS styling support', test_theme,
     workdir: meson.current_source_dir()
   )
+endif
 
 libst_gir = gnome.generate_gir(libst,
   sources: st_gir_sources,