first commit

core/tests/fixtures/test_stable/test_stable.info.yml

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+name: Test Stable
+type: theme
+base theme: stable9
+description: A theme to test that stable 9 is set as the default.
+# version: VERSION
+
+# Information added by Drupal.org packaging script on 2024-07-04
+version: '10.3.1'
+project: 'drupal'
+datestamp: 1720094222

core/tests/fixtures/test_stable/test_stable.theme

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+<?php
+
+/**
+ * @file
+ * Test preprocess functions for theme test_stable.
+ */
+
+/**
+ * Implements hook_preprocess_theme_test_render_element().
+ */
+function test_stable_preprocess_theme_test_render_element($variables) {
+  // This is used for Drupal\Tests\Core\Theme\RegistryTest.
+}