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diff --git a/web/core/modules/simpletest/src/Cache/Context/TestDiscoveryCacheContext.php b/web/core/modules/simpletest/src/Cache/Context/TestDiscoveryCacheContext.php
new file mode 100644
index 000000000..e3d5cf351
--- /dev/null
+++ b/web/core/modules/simpletest/src/Cache/Context/TestDiscoveryCacheContext.php
@@ -0,0 +1,94 @@
+<?php
+
+namespace Drupal\simpletest\Cache\Context;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Cache\Context\CacheContextInterface;
+use Drupal\Core\PrivateKey;
+use Drupal\Core\Site\Settings;
+use Drupal\simpletest\TestDiscovery;
+
+/**
+ * Defines the TestDiscoveryCacheContext service.
+ *
+ * Cache context ID: 'test_discovery'.
+ */
+class TestDiscoveryCacheContext implements CacheContextInterface {
+
+  /**
+   * The test discovery service.
+   *
+   * @var \Drupal\simpletest\TestDiscovery
+   */
+  protected $testDiscovery;
+
+  /**
+   * The private key service.
+   *
+   * @var \Drupal\Core\PrivateKey
+   */
+  protected $privateKey;
+
+  /**
+   * The hash of discovered test information.
+   *
+   * Services should not be stateful, but we only keep this information per
+   * request. That way we don't perform a file scan every time we need this
+   * hash. The test scan results are unlikely to change during the request.
+   *
+   * @var string
+   */
+  protected $hash;
+
+  /**
+   * Construct a test discovery cache context.
+   *
+   * @param \Drupal\simpletest\TestDiscovery $test_discovery
+   *   The test discovery service.
+   * @param \Drupal\Core\PrivateKey $private_key
+   *   The private key service.
+   */
+  public function __construct(TestDiscovery $test_discovery, PrivateKey $private_key) {
+    $this->testDiscovery = $test_discovery;
+    $this->privateKey = $private_key;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getLabel() {
+    return t('Test discovery');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getContext() {
+    if (empty($this->hash)) {
+      $tests = $this->testDiscovery->getTestClasses();
+      $this->hash = $this->hash(serialize($tests));
+    }
+    return $this->hash;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheableMetadata() {
+    return new CacheableMetadata();
+  }
+
+  /**
+   * Hashes the given string.
+   *
+   * @param string $identifier
+   *   The string to be hashed.
+   *
+   * @return string
+   *   The hash.
+   */
+  protected function hash($identifier) {
+    return hash('sha256', $this->privateKey->get() . Settings::getHashSalt() . $identifier);
+  }
+
+}