Issue #3230507: Create build tests for case where site is using core recommended Composer project

src/Event/PreStartEvent.php

@@ -9,6 +9,17 @@ class PreStartEvent extends UpdateEvent {
 
   use ExcludedPathsTrait;
 
+  /**
+   * The name of the Drupal core package in the project-level composer.json.
+   *
+   * Will be either 'drupal/core' or 'drupal/core-recommended'.
+   *
+   * @see \Drupal\automatic_updates\Updater::getCorePackageName()
+   *
+   * @var string
+   */
+  protected $corePackageName;
+
   /**
    * The desired package versions to update to, keyed by package name.
    *
@@ -19,14 +30,30 @@ class PreStartEvent extends UpdateEvent {
   /**
    * Constructs a PreStartEvent.
    *
+   * @param string $core_package_name
+   *   The name of the Drupal core package in the project-level composer.json.
    * @param string[] $package_versions
    *   (optional) The desired package versions to update to, keyed by package
    *   name.
    */
-  public function __construct(array $package_versions = []) {
+  public function __construct(string $core_package_name, array $package_versions = []) {
+    $this->corePackageName = $core_package_name;
     $this->packageVersions = $package_versions;
   }
 
+  /**
+   * Returns the name of the Drupal core package in the project's composer.json.
+   *
+   * @return string
+   *   The name of the Drupal core package in the project-level composer.json.
+   *   Will be either 'drupal/core' or 'drupal/core-recommended'.
+   *
+   * @see \Drupal\automatic_updates\Updater::getCorePackageName()
+   */
+  public function getCorePackageName(): string {
+    return $this->corePackageName;
+  }
+
   /**
    * Returns the desired package versions to update to.
    *