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diff --git a/web/core/modules/rest/tests/src/Functional/EntityResource/FormatSpecificGetBcRouteTestTrait.php b/web/core/modules/rest/tests/src/Functional/EntityResource/FormatSpecificGetBcRouteTestTrait.php
new file mode 100644
index 000000000..54bf816c2
--- /dev/null
+++ b/web/core/modules/rest/tests/src/Functional/EntityResource/FormatSpecificGetBcRouteTestTrait.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource;
+
+use Drupal\Core\Url;
+use Symfony\Component\Routing\Exception\RouteNotFoundException;
+
+/**
+ * Provides test methods to assert BC on format-specific GET routes.
+ *
+ * @internal
+ */
+trait FormatSpecificGetBcRouteTestTrait {
+
+  /**
+   * @group legacy
+   *
+   * @see \Drupal\rest\RouteProcessor\RestResourceGetRouteProcessorBC
+   */
+  public function testFormatSpecificGetBcRoute() {
+    $this->provisionEntityResource();
+    $url = $this->getEntityResourceUrl();
+
+    // BC: Format-specific GET routes are deprecated. They are available on both
+    // new and old sites, but trigger deprecation notices.
+    $bc_route = Url::fromRoute('rest.entity.' . static::$entityTypeId . '.GET.' . static::$format, $url->getRouteParameters(), $url->getOptions());
+    $bc_route->setUrlGenerator($this->container->get('url_generator'));
+    $this->expectDeprecation(sprintf("The 'rest.entity.entity_test.GET.%s' route is deprecated since version 8.5.x and will be removed in 9.0.0. Use the 'rest.entity.entity_test.GET' route instead.", static::$format));
+    $this->assertSame($url->toString(TRUE)->getGeneratedUrl(), $bc_route->toString(TRUE)->getGeneratedUrl());
+  }
+
+  /**
+   * @group legacy
+   *
+   * @see \Drupal\rest\Plugin\ResourceBase::routes
+   */
+  public function testNoFormatSpecificGetBcRouteForOtherFormats() {
+    $this->setExpectedException(RouteNotFoundException::class);
+
+    $this->provisionEntityResource();
+    $url = $this->getEntityResourceUrl();
+
+    // Verify no format-specific GET BC routes are created for other formats.
+    $other_format = static::$format === 'json' ? 'xml' : 'json';
+    $bc_route_other_format = Url::fromRoute('rest.entity.entity_test.GET.' . $other_format, $url->getRouteParameters(), $url->getOptions());
+    $bc_route_other_format->setUrlGenerator($this->container->get('url_generator'));
+    $bc_route_other_format->toString(TRUE);
+  }
+
+}