diff --git a/tests/Unit/Service/TrustedCookie/DateTime/ExpirationHelperTest.php b/tests/Unit/Service/TrustedCookie/DateTime/ExpirationHelperTest.php
index 394fbdfd..f8104ce8 100644
--- a/tests/Unit/Service/TrustedCookie/DateTime/ExpirationHelperTest.php
+++ b/tests/Unit/Service/TrustedCookie/DateTime/ExpirationHelperTest.php
@@ -36,13 +36,22 @@ public function test_is_expired(bool $isExpired, ExpirationHelper $helper, Cooki
     }
 
     /**
-     * @dataProvider gracePeriodExpectations
+     * @dataProvider expirationValues
      */
-    public function test_grace_period(bool $isExpired, ExpirationHelper $helper, CookieValue $cookieValue): void
+    public function test_expiration_period(bool $isExpired, ExpirationHelper $helper, CookieValue $cookieValue): void
     {
         self::assertEquals($isExpired, $helper->isExpired($cookieValue));
     }
 
+    public function expirationValues(): array
+    {
+        // Cookie lifetime 3600
+        $helper = $this->makeExpirationHelper(3600, time());
+        return [
+            'within period' => [false, $helper, $this->makeCookieValue(time() - 3600)],
+            'outside period' => [true, $helper, $this->makeCookieValue(time() - 3601)],
+        ];
+    }
 
     public function invalidTimeExpectations(): array
     {
@@ -97,16 +106,6 @@ public function expirationExpectations(): array
         ];
     }
 
-    public function gracePeriodExpectations(): array
-    {
-        // Cookie lifetime 3600
-        $helper = $this->makeExpirationHelper(3600, time());
-        return [
-            'within grace period (lower bound)' => [false, $helper, $this->makeCookieValue(time() - 3600)],
-            'outside grace period' => [true, $helper, $this->makeCookieValue(time() - 3601)],
-        ];
-    }
-
     private function makeExpirationHelper(int $expirationTime, int $now) : ExpirationHelper
     {
         $time = new \DateTime();