.../rest/src/Tests/NodeXmlBasicAuthTest.php        | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/core/modules/rest/src/Tests/NodeXmlBasicAuthTest.php b/core/modules/rest/src/Tests/NodeXmlBasicAuthTest.php
new file mode 100644
index 0000000..5e2df00
--- /dev/null
+++ b/core/modules/rest/src/Tests/NodeXmlBasicAuthTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\rest\Tests;
+
+/**
+ * @group rest
+ */
+class NodeXmlBasicAuthTest extends NodeResourceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'xml';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'text/xml; charset=UTF-8';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $expectedErrorMimeType = 'text/xml; charset=UTF-8';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedNormalizedEntity() {
+    return array_map(function ($value) { return isset($value[0]) ? $value[0] : ''; }, parent::getExpectedNormalizedEntity());
+  }
+
+  // methods to provide one-off expectations/data/…
+}