.../rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 41d1e15..a7db61c 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -239,7 +239,7 @@ public function testPost() {
     // DX: 404 when resource not provisioned.
     $response = $this->request('POST', $url, $request_options);
     // @todo Open issue to improve this message: it should list '/relative/url?query-string', not just '/relative/url'.
-    $this->assertResourceErrorResponse(404, 'No route found for "POST ' . $this->getPostUrl()->toString() . '"', $response);
+    $this->assertResourceErrorResponse(404, 'No route found for "POST ' . str_replace($this->baseUrl, '', $this->getPostUrl()->setAbsolute()->toString()) . '"', $response);
 
     $this->provisionEntityResource();