Ide Braakman
--- a/tests/src/Functional/DiffPluginEntityTest.php
+++ b/tests/src/Functional/DiffPluginEntityTest.php
    ]);

    // Reference article B in article A.
+    $this->drupalGet('node/' . $node1->id() . '/edit');
--- a/tests/src/Functional/DiffRevisionContentModerationTest.php
+++ b/tests/src/Functional/DiffRevisionContentModerationTest.php
   *
   * Override form submission to work with content moderation.
   */
-  protected function drupalPostNodeForm($path, array $edit, $submit): void {
+  protected function submitForm(array $edit, $submit, $form_html_id = NULL): void {
    // New revisions are automatically enabled, so remove the manual value.
    unset($edit['revision']);
-    parent::drupalPostNodeForm($path, $edit, $submit);
+    parent::submitForm($edit, $submit, $form_html_id);