Add release notes for cakephp/cakephp#18213

Author: markstory

en/appendices/5-2-migration-guide.rst

@@ -101,6 +101,12 @@ Datasource
   This allows you to create dynamic validation messages based on the entity
   state and validation rule options.
 
+Error
+-----
+
+- Custom exceptions can have specific error handling logic defined in
+  ``ErrorController``.
+
 ORM
 ---
 
@@ -112,6 +118,13 @@ ORM
   used to hydrate junction table records.
 - ``Table::findOrCreate()`` now accepts an array as second argument to directly pass data in.
 
+TestSuite
+---------
+
+- ``TestFixture::$strictFields`` was added. Enabling this property will make
+  fixtures raise an error if a fixture's record list contains fields that do not
+  exist in the schema.
+
 View
 ----
 
@@ -122,8 +135,3 @@ View
 - ``FormHelper`` now uses the ``containerClass`` template to apply a class to
   the form control div. The default value is ``input``.
 
-Error
------
-
-- Custom exceptions can have specific error handling logic defined in
-  ``ErrorController``.

en/development/testing.rst

@@ -629,6 +629,28 @@ should be an associative array of the columns and values for the row. Just keep
 in mind that each record in the ``$records`` array must have the same keys as
 rows are bulk inserted.
 
+As you evolve your schema your fixture records may accumulate unused or
+unsupported fields. You can enable ``strictFields`` on a fixture to have errors
+raised when a record contains fields that are not defined in the schema::
+
+    namespace App\Test\Fixture;
+
+    use Cake\TestSuite\Fixture\TestFixture;
+
+    class ArticlesFixture extends TestFixture
+    {
+        protected $strictFields = true;
+
+        // rest of fixture
+    }
+
+The ``strictFields`` mode can be useful in catching typos or when you want to
+enforce stricter maintenance of test data.
+
+.. versionadded:: 5.2.0
+    ``TestFixture::$strictFields`` was added.
+
+
 Dynamic Data
 ------------