diff --git a/api/tests/api/Views/BrowseWorkingHoursMonthlyCest.php b/api/tests/api/Views/BrowseWorkingHoursMonthlyCest.php
index 2ba0d98..4208663 100644
--- a/api/tests/api/Views/BrowseWorkingHoursMonthlyCest.php
+++ b/api/tests/api/Views/BrowseWorkingHoursMonthlyCest.php
@@ -14,6 +14,10 @@ class BrowseWorkingHoursMonthlyCest
         $I->haveHttpHeader('Access-Control-Request-Method', 'GET');
         $I->sendOptions('/views/working-hours/monthly');
         $I->seeResponseCodeIs(HttpCode::OK);
+        $I->seeHttpHeader('Access-Control-Allow-Origin', Api::TEST_ORIGIN);
+        $I->seeHttpHeader('Access-Control-Allow-Methods');
+        $I->seeHttpHeader('Access-Control-Allow-Headers');
+        $I->seeHttpHeader('Access-Control-Max-Age');
     }
 
     /**
diff --git a/api/tests/api/Views/BrowseWorkingHoursWeeklyCest.php b/api/tests/api/Views/BrowseWorkingHoursWeeklyCest.php
index d3dace9..2ba0c72 100644
--- a/api/tests/api/Views/BrowseWorkingHoursWeeklyCest.php
+++ b/api/tests/api/Views/BrowseWorkingHoursWeeklyCest.php
@@ -14,6 +14,10 @@ class BrowseWorkingHoursWeeklyCest
         $I->haveHttpHeader('Access-Control-Request-Method', 'GET');
         $I->sendOptions('/views/working-hours/weekly');
         $I->seeResponseCodeIs(HttpCode::OK);
+        $I->seeHttpHeader('Access-Control-Allow-Origin', Api::TEST_ORIGIN);
+        $I->seeHttpHeader('Access-Control-Allow-Methods');
+        $I->seeHttpHeader('Access-Control-Allow-Headers');
+        $I->seeHttpHeader('Access-Control-Max-Age');
     }
 
     /**
diff --git a/api/tests/api/Views/BrowseWorkingHoursYearlyCest.php b/api/tests/api/Views/BrowseWorkingHoursYearlyCest.php
index 45d0b49..c42bfaa 100644
--- a/api/tests/api/Views/BrowseWorkingHoursYearlyCest.php
+++ b/api/tests/api/Views/BrowseWorkingHoursYearlyCest.php
@@ -14,6 +14,10 @@ class BrowseWorkingHoursYearlyCest
         $I->haveHttpHeader('Access-Control-Request-Method', 'GET');
         $I->sendOptions('/views/working-hours/yearly');
         $I->seeResponseCodeIs(HttpCode::OK);
+        $I->seeHttpHeader('Access-Control-Allow-Origin', Api::TEST_ORIGIN);
+        $I->seeHttpHeader('Access-Control-Allow-Methods');
+        $I->seeHttpHeader('Access-Control-Allow-Headers');
+        $I->seeHttpHeader('Access-Control-Max-Age');
     }
 
     /**
diff --git a/api/tests/api/WorkingHours/BrowseWorkingHoursCest.php b/api/tests/api/WorkingHours/BrowseWorkingHoursCest.php
index 0cd7872..65a5d1b 100644
--- a/api/tests/api/WorkingHours/BrowseWorkingHoursCest.php
+++ b/api/tests/api/WorkingHours/BrowseWorkingHoursCest.php
@@ -14,6 +14,10 @@ class BrowseWorkingHoursCest
         $I->haveHttpHeader('Access-Control-Request-Method', 'GET');
         $I->sendOptions('/working-hours');
         $I->seeResponseCodeIs(HttpCode::OK);
+        $I->seeHttpHeader('Access-Control-Allow-Origin', Api::TEST_ORIGIN);
+        $I->seeHttpHeader('Access-Control-Allow-Methods');
+        $I->seeHttpHeader('Access-Control-Allow-Headers');
+        $I->seeHttpHeader('Access-Control-Max-Age');
     }
 
     /**
diff --git a/api/tests/api/WorkingHours/CreateWorkingHoursCest.php b/api/tests/api/WorkingHours/CreateWorkingHoursCest.php
index 79e0819..c2707bc 100644
--- a/api/tests/api/WorkingHours/CreateWorkingHoursCest.php
+++ b/api/tests/api/WorkingHours/CreateWorkingHoursCest.php
@@ -14,6 +14,10 @@ class CreateWorkingHoursCest
         $I->haveHttpHeader('Access-Control-Request-Method', 'POST');
         $I->sendOptions('/working-hours');
         $I->seeResponseCodeIs(HttpCode::OK);
+        $I->seeHttpHeader('Access-Control-Allow-Origin', Api::TEST_ORIGIN);
+        $I->seeHttpHeader('Access-Control-Allow-Methods');
+        $I->seeHttpHeader('Access-Control-Allow-Headers');
+        $I->seeHttpHeader('Access-Control-Max-Age');
     }
 
     public function createWorkingHoursWithNewValidRecord(ApiTester $I): void
diff --git a/api/tests/api/WorkingHours/ReadWorkingHoursCest.php b/api/tests/api/WorkingHours/ReadWorkingHoursCest.php
index 1d95243..2f2eafb 100644
--- a/api/tests/api/WorkingHours/ReadWorkingHoursCest.php
+++ b/api/tests/api/WorkingHours/ReadWorkingHoursCest.php
@@ -14,6 +14,10 @@ class ReadWorkingHoursCest
         $I->haveHttpHeader('Access-Control-Request-Method', 'GET');
         $I->sendOptions('/working-hours/2020-04-15');
         $I->seeResponseCodeIs(HttpCode::OK);
+        $I->seeHttpHeader('Access-Control-Allow-Origin', Api::TEST_ORIGIN);
+        $I->seeHttpHeader('Access-Control-Allow-Methods');
+        $I->seeHttpHeader('Access-Control-Allow-Headers');
+        $I->seeHttpHeader('Access-Control-Max-Age');
     }
 
     public function readExistingWorkingHours(ApiTester $I): void
diff --git a/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php b/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php
index c6cc08c..176eb88 100644
--- a/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php
+++ b/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php
@@ -14,6 +14,10 @@ class UpdateWorkingHoursCest
         $I->haveHttpHeader('Access-Control-Request-Method', 'PUT');
         $I->sendOptions('/working-hours/2020-01-15');
         $I->seeResponseCodeIs(HttpCode::OK);
+        $I->seeHttpHeader('Access-Control-Allow-Origin', Api::TEST_ORIGIN);
+        $I->seeHttpHeader('Access-Control-Allow-Methods');
+        $I->seeHttpHeader('Access-Control-Allow-Headers');
+        $I->seeHttpHeader('Access-Control-Max-Age');
     }
 
     public function updateWorkingHoursWithExistingValidRecord(ApiTester $I): void