This test seems to require a D-Bus connection not available in the build
environment.

diff -ur /tmp/guix-build-gnome-shell-3.34.2.drv-0/gnome-shell-3.34.2/src/st/meson.build b/src/st/meson.build
--- /tmp/guix-build-gnome-shell-3.34.2.drv-0/gnome-shell-3.34.2/src/st/meson.build	1969-12-31 19:00:00.000000000 -0500
+++ b/src/st/meson.build	2019-12-23 00:46:14.721198022 -0500
@@ -132,18 +132,6 @@
   sources: st_enums[1]
 )
 
-test_theme = executable('test-theme',
-  sources: 'test-theme.c',
-  c_args: st_cflags,
-  dependencies: [mutter_dep, gtk_dep],
-  build_rpath: mutter_typelibdir,
-  link_with: libst
-)
-
-test('CSS styling support', test_theme,
-  workdir: meson.current_source_dir()
-)
-
 libst_gir = gnome.generate_gir(libst,
   sources: st_gir_sources,
   nsversion: '1.0',
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