<?php
// $Id$

/**
 * @file
 * Tests for the Database Schema API.
 */

/**
 * Unit tests for the Schema API.
 */
class SchemaTestCase extends DrupalWebTestCase {
  function getInfo() {
    return array(
      'name' => t('Schema API'),
      'description' => t('Tests table creation and modification via the schema API.'),
      'group' => t('Database'),
    );
  }

  /**
   * 
   */
  function testSchema() {
    // Try creating a table.
    $table_name = 'test';
    $table_specification = array(
      'fields' => array(
        'id'  => array(
          'type' => 'int',
          'default' => NULL,
        ),
        'test'  => array(
          'type' => 'int',
          'not null' => TRUE,
        ),
      ),
    );
    $ret = array();
    db_create_table($ret, $table_name, $table_specification);

    // Assert that the table exists.
    $this->assertTrue(db_table_exists($table_name), t('The table exists.'));

    // An insert without a value for the column 'test' should fail.
    $field_name = 'test';
    $this->assertFalse($this->tryInsert(), t('Insert without a default failed.'));

    // Add a default value to the column.
    db_field_set_default($ret, $table_name, $field_name, 0);
    // The insert should now succeed.
    $this->assertTrue($this->tryInsert(), t('Insert with a default succeeded.'));

    // Remove the default.
    db_field_set_no_default($ret, $table_name, $field_name);
    // The insert should fail again.
    $this->assertFalse($this->tryInsert(), t('Insert without a default failed.'));

    // Rename the table.
    db_rename_table($ret, $table_name, $table_name . '_test');
    // We need the default so that we can insert after the rename.
    db_field_set_default($ret, $table_name . '_test', $field_name, 0);
    $this->assertFalse($this->tryInsert(), t('Insert into the old table failed.'));
    $this->assertTrue($this->tryInsert('_test'), t('Insert into the new table succeeded.'));

    // Try to drop the table.
    db_drop_table($ret, $table_name . '_test');
    $this->assertFalse(db_table_exists($table_name . '_test'), t('The renamed table does not exist.'));

    // Recreate the table.
    db_create_table($ret, $table_name, $table_specification);
    db_field_set_default($ret, $table_name, $field_name, 0);
    db_add_field($ret, $table_name, 'test2', array('type' => 'int', 'not null' => TRUE, 'default' => 0));

    // Change the new field to a serial column.
    db_change_field($ret, $table_name, 'test2', 'test2', array('type' => 'serial', 'not null' => TRUE), array('primary key' => array('test2')));

    $this->assertTrue($this->tryInsert(), t('Insert with a serial succeeded.'));
    $max1 = db_query('SELECT MAX(test2) FROM test')->fetchField();
    $this->assertTrue($this->tryInsert(), t('Insert with a serial succeeded.'));
    $max2 = db_query('SELECT MAX(test2) FROM test')->fetchField();
    $this->assertTrue($max2 > $max1, t('The serial is monotone.'));

    $count = db_query('SELECT COUNT(test2) FROM test')->fetchField();
    $this->assertEqual($count, 2, t('There were two rows.'));
  }

  function tryInsert($tablepostfix = '') {
    try {
      db_query("INSERT INTO {test$tablepostfix} (id) VALUES (:id)", array(':id' => mt_rand(10,20)));
      return TRUE;
    }
    catch (Exception $e) {
      return FALSE;
    }
  }
}