.../EntityResource/Item/ItemXmlAnonTest.php        | 26 ++++++++++++++++
 .../EntityResource/Item/ItemXmlBasicAuthTest.php   | 36 ++++++++++++++++++++++
 .../EntityResource/Item/ItemXmlCookieTest.php      | 31 +++++++++++++++++++
 3 files changed, 93 insertions(+)

diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlAnonTest.php b/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlAnonTest.php
new file mode 100644
index 0000000..72a3035
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlAnonTest.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\Item;
+
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\XmlEntityNormalizationQuirksTrait;
+
+/**
+ * @group rest
+ */
+class ItemXmlAnonTest extends ItemResourceTestBase {
+
+  use AnonResourceTestTrait;
+  use XmlEntityNormalizationQuirksTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'xml';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'text/xml; charset=UTF-8';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlBasicAuthTest.php b/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlBasicAuthTest.php
new file mode 100644
index 0000000..8da0a58
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlBasicAuthTest.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\Item;
+
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\XmlEntityNormalizationQuirksTrait;
+
+/**
+ * @group rest
+ */
+class ItemXmlBasicAuthTest extends ItemResourceTestBase {
+
+  use BasicAuthResourceTestTrait;
+  use XmlEntityNormalizationQuirksTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'xml';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'text/xml; charset=UTF-8';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlCookieTest.php b/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlCookieTest.php
new file mode 100644
index 0000000..5fae069
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Item/ItemXmlCookieTest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\Item;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\XmlEntityNormalizationQuirksTrait;
+
+/**
+ * @group rest
+ */
+class ItemXmlCookieTest extends ItemResourceTestBase {
+
+  use CookieResourceTestTrait;
+  use XmlEntityNormalizationQuirksTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'xml';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'text/xml; charset=UTF-8';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+}