diff --git a/tests/Fixtures/bookstore/schema.xml b/tests/Fixtures/bookstore/schema.xml
index 6cfca836ff..e5b2f80a24 100644
--- a/tests/Fixtures/bookstore/schema.xml
+++ b/tests/Fixtures/bookstore/schema.xml
@@ -323,6 +323,10 @@
         <foreign-key foreignTable="book" onDelete="setnull" phpName="Work">
             <reference local="prize_book_id" foreign="id"/>
         </foreign-key>
+        <unique>
+            <unique-column name="bookstore_id"/>
+            <unique-column name="contest_id"/>
+        </unique>
     </table>
 
     <table name="bookstore_contest_entry" reloadOnInsert="true">
diff --git a/tests/Fixtures/schemas/schema.xml b/tests/Fixtures/schemas/schema.xml
index 4c41ec2b8a..7f6911ca21 100644
--- a/tests/Fixtures/schemas/schema.xml
+++ b/tests/Fixtures/schemas/schema.xml
@@ -67,6 +67,10 @@
         <foreign-key foreignTable="bookstore" foreignSchema="bookstore_schemas" onDelete="cascade">
             <reference local="bookstore_id" foreign="id"/>
         </foreign-key>
+        <unique>
+            <unique-column name="id"/>
+            <unique-column name="bookstore_id"/>
+        </unique>
     </table>
 
     <table name="second_hand_book" schema="second_hand_books">