Issue #3396574 by Spokje: Exclude copying 'core/node_modules' in getCodebaseFinder

(cherry picked from commit 465cb227)

core/tests/Drupal/BuildTests/Framework/BuildTestBase.php

@@ -546,9 +546,8 @@ protected function getPortNumber() {
    * Use this method to copy the current codebase, including any patched
    * changes, into the workspace.
    *
-   * By default, the copy will exclude sites/default/settings.php,
-   * sites/default/files, and vendor/. Use the $iterator parameter to override
-   * this behavior.
+   * By default, the copy will exclude site-specific and build-related files and
+   * directories. Use the $iterator parameter to override this behavior.
    *
    * @param \Iterator|null $iterator
    *   (optional) An iterator of all the files to copy. Default behavior is to
@@ -589,6 +588,7 @@ public function getCodebaseFinder() {
       ->notPath('#^sites/default/files#')
       ->notPath('#^sites/simpletest#')
       ->notPath('#^vendor#')
+      ->notPath('#^core/node_modules#')
       ->notPath('#^sites/default/settings\..*php#')
       ->ignoreDotFiles(FALSE)
       ->ignoreVCS(FALSE);