diff --git a/tests/dbal/db_tools_test.php b/tests/dbal/db_tools_test.php
index e25335165a..0715b09ea3 100644
--- a/tests/dbal/db_tools_test.php
+++ b/tests/dbal/db_tools_test.php
@@ -11,7 +11,9 @@ require_once dirname(__FILE__) . '/../../phpBB/includes/functions.php';
 
 class phpbb_dbal_db_tools_test extends phpbb_database_test_case
 {
+	/** @var \phpbb\db\driver\driver_interface */
 	protected $db;
+	/** @var \phpbb\db\tools */
 	protected $tools;
 	protected $table_exists;
 	protected $table_data;
@@ -207,6 +209,32 @@ class phpbb_dbal_db_tools_test extends phpbb_database_test_case
 		$this->assertFalse($this->tools->sql_column_exists('prefix_table_name', 'column_does_not_exist'));
 	}
 
+	public function test_column_change_with_index()
+	{
+		// Create column
+		$this->assertFalse($this->tools->sql_column_exists('prefix_table_name', 'c_bug_12012'));
+		$this->assertTrue($this->tools->sql_column_add('prefix_table_name', 'c_bug_12012', array('DECIMAL', 0)));
+		$this->assertTrue($this->tools->sql_column_exists('prefix_table_name', 'c_bug_12012'));
+
+		// Create index over the column
+		$this->assertFalse($this->tools->sql_index_exists('prefix_table_name', 'i_bug_12012'));
+		$this->assertTrue($this->tools->sql_create_index('prefix_table_name', 'i_bug_12012', array('c_bug_12012', 'c_bool')));
+		$this->assertTrue($this->tools->sql_index_exists('prefix_table_name', 'i_bug_12012'));
+
+		// Change type from int to string
+		$this->assertTrue($this->tools->sql_column_change('prefix_table_name', 'c_bug_12012', array('VCHAR:100', '')));
+
+		// Remove the index
+		$this->assertTrue($this->tools->sql_index_exists('prefix_table_name', 'i_bug_12012'));
+		$this->assertTrue($this->tools->sql_index_drop('prefix_table_name', 'i_bug_12012'));
+		$this->assertFalse($this->tools->sql_index_exists('prefix_table_name', 'i_bug_12012'));
+
+		// Remove the column
+		$this->assertTrue($this->tools->sql_column_exists('prefix_table_name', 'c_bug_12012'));
+		$this->assertTrue($this->tools->sql_column_remove('prefix_table_name', 'c_bug_12012'));
+		$this->assertFalse($this->tools->sql_column_exists('prefix_table_name', 'c_bug_12012'));
+	}
+
 	public function test_column_remove()
 	{
 		$this->assertTrue($this->tools->sql_column_exists('prefix_table_name', 'c_int_size'));
@@ -252,7 +280,7 @@ class phpbb_dbal_db_tools_test extends phpbb_database_test_case
 		$this->assertFalse($this->tools->sql_table_exists('prefix_test_table'));
 	}
 
-	public function test_peform_schema_changes_drop_tables()
+	public function test_perform_schema_changes_drop_tables()
 	{
 		$db_tools = $this->getMock('\phpbb\db\tools', array(
 			'sql_table_exists',
@@ -278,7 +306,7 @@ class phpbb_dbal_db_tools_test extends phpbb_database_test_case
 		));
 	}
 
-	public function test_peform_schema_changes_drop_columns()
+	public function test_perform_schema_changes_drop_columns()
 	{
 		$db_tools = $this->getMock('\phpbb\db\tools', array(
 			'sql_column_exists',