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

diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 59cacc1..0be12c8 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -560,6 +560,7 @@ public function testPost() {
     // DX: 404 when resource not provisioned, but HTML if canonical route.
     $response = $this->request('POST', $url, $request_options);
     if ($has_canonical_url) {
+      // Tricky: '/user' is also a non-REST route!
       $this->assertSame(static::$entityTypeId === 'user' ? 405 : 404, $response->getStatusCode());
       $this->assertSame(['text/html; charset=UTF-8'], $response->getHeader('Content-Type'));
     }
@@ -573,6 +574,7 @@ public function testPost() {
 
     // DX: 404 when resource not provisioned.
     $response = $this->request('POST', $url, $request_options);
+    // Tricky: '/user' is also a non-REST route!
     if (static::$entityTypeId === 'user') {
       $this->assertResourceErrorResponse(405, 'No route found for "POST ' . str_replace($this->baseUrl, '', $this->getPostUrl()->setAbsolute()->toString()) . '": Method Not Allowed (Allow: GET, HEAD)', $response);
     }