[mutter] tests/build: Set up test environment using a dict()

[Marge Bot <marge-bot src gnome org>]

commit 189068d465b635be897429a28cb517ddda047619
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Feb 9 10:35:53 2022 +0100

    tests/build: Set up test environment using a dict()
    
    This will allow us to reuse the keys and values more easily, as later
    commits will rely on being able to iterate over the keys and values to
    construct explict env strings for passing into special test cases.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2152>

 src/tests/meson.build | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/src/tests/meson.build b/src/tests/meson.build
index a19703288a..2cb05d9668 100644
--- a/src/tests/meson.build
+++ b/src/tests/meson.build
@@ -90,9 +90,16 @@ if have_installed_tests
 endif
 
 test_env = environment()
-test_env.set('G_TEST_SRCDIR', join_paths(mutter_srcdir, 'src'))
-test_env.set('G_TEST_BUILDDIR', mutter_builddir)
-test_env.set('MUTTER_TEST_PLUGIN_PATH', '@0@'.format(default_plugin.full_path()))
+
+test_env_variables = {
+  'G_TEST_SRCDIR': join_paths(mutter_srcdir, 'src'),
+  'G_TEST_BUILDDIR': mutter_builddir,
+  'MUTTER_TEST_PLUGIN_PATH': '@0@'.format(default_plugin.full_path()),
+}
+
+foreach name, value: test_env_variables
+  test_env.set(name, value)
+endforeach
 
 test_client = executable('mutter-test-client',
   sources: ['test-client.c'],