changeColumn() defaulting.

Author: dereuromark

tests/TestCase/Db/Adapter/MysqlAdapterTest.php

@@ -961,8 +961,8 @@ public function testChangeColumnPreservesDefaultValue()
         $table->addColumn('column1', 'string', ['default' => 'original_default', 'null' => false, 'limit' => 100])
               ->save();
 
-        // Change only the null property, default should be preserved
-        $table->changeColumn('column1', 'string', ['null' => true])->save();
+        // Use updateColumn which preserves by default
+        $table->updateColumn('column1', 'string', ['null' => true])->save();
 
         $rows = $this->adapter->fetchAll('SHOW COLUMNS FROM t');
         $this->assertEquals('original_default', $rows[1]['Default']);
@@ -976,8 +976,8 @@ public function testChangeColumnPreservesDefaultValueWithDifferentType()
         $table->addColumn('column1', 'integer', ['default' => 42, 'null' => false])
               ->save();
 
-        // Change type to biginteger, default should be preserved
-        $table->changeColumn('column1', 'biginteger', [])->save();
+        // Use updateColumn to preserve default when changing type
+        $table->updateColumn('column1', 'biginteger', [])->save();
 
         $rows = $this->adapter->fetchAll('SHOW COLUMNS FROM t');
         $this->assertEquals('42', $rows[1]['Default']);
@@ -1016,8 +1016,8 @@ public function testChangeColumnWithNullTypePreservesType()
         $table->addColumn('column1', 'string', ['default' => 'test', 'limit' => 100])
               ->save();
 
-        // Pass null as type to preserve existing type
-        $table->changeColumn('column1', null, ['null' => true])->save();
+        // Use updateColumn with null type to preserve everything
+        $table->updateColumn('column1', null, ['null' => true])->save();
 
         $rows = $this->adapter->fetchAll('SHOW COLUMNS FROM t');
         $this->assertEquals('varchar(100)', $rows[1]['Type']);