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<?php

namespace Drupal\Tests\Core\Database;

use Drupal\Tests\Core\Database\Stub\StubConnection;
use Drupal\Tests\UnitTestCase;

/**
 * Tests the Connection class.
 *
 * @group Database
 */
class ConnectionTest extends UnitTestCase {

  /**
   * Dataprovider for testPrefixRoundTrip().
   *
   * @return array
   *   Array of arrays with the following elements:
   *   - Arguments to pass to Connection::setPrefix().
   *   - Expected result from Connection::tablePrefix().
   */
  public function providerPrefixRoundTrip() {
    return [
      [
        ['' => 'test_'],
        'test_',
      ],
      [
        [
          'fooTable' => 'foo_',
          'barTable' => 'bar_',
        ],
        [
          'fooTable' => 'foo_',
          'barTable' => 'bar_',
        ],
      ],
    ];
  }

  /**
   * Exercise setPrefix() and tablePrefix().
   *
   * @dataProvider providerPrefixRoundTrip
   */
  public function testPrefixRoundTrip($expected, $prefix_info) {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    $connection = new StubConnection($mock_pdo, []);

    // setPrefix() is protected, so we make it accessible with reflection.
    $reflection = new \ReflectionClass('Drupal\Tests\Core\Database\Stub\StubConnection');
    $set_prefix = $reflection->getMethod('setPrefix');
    $set_prefix->setAccessible(TRUE);

    // Set the prefix data.
    $set_prefix->invokeArgs($connection, [$prefix_info]);
    // Check the round-trip.
    foreach ($expected as $table => $prefix) {
      $this->assertEquals($prefix, $connection->tablePrefix($table));
    }
  }

  /**
   * Dataprovider for testPrefixTables().
   *
   * @return array
   *   Array of arrays with the following elements:
   *   - Expected result.
   *   - Table prefix.
   *   - Query to be prefixed.
   */
  public function providerTestPrefixTables() {
    return [
      [
        'SELECT * FROM test_table',
        'test_',
        'SELECT * FROM {table}',
      ],
      [
        'SELECT * FROM first_table JOIN second_thingie',
        [
          'table' => 'first_',
          'thingie' => 'second_',
        ],
        'SELECT * FROM {table} JOIN {thingie}',
      ],
    ];
  }

  /**
   * Exercise the prefixTables() method.
   *
   * @dataProvider providerTestPrefixTables
   */
  public function testPrefixTables($expected, $prefix_info, $query) {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    $connection = new StubConnection($mock_pdo, ['prefix' => $prefix_info]);
    $this->assertEquals($expected, $connection->prefixTables($query));
  }

  /**
   * Dataprovider for testEscapeMethods().
   *
   * @return array
   *   Array of arrays with the following elements:
   *   - Expected escaped string.
   *   - String to escape.
   */
  public function providerEscapeMethods() {
    return [
      ['thing', 'thing'],
      ['_item', '_item'],
      ['item_', 'item_'],
      ['_item_', '_item_'],
      ['', '!@#$%^&*()-=+'],
      ['123', '!1@2#3'],
    ];
  }

  /**
   * Test the various escaping methods.
   *
   * All tested together since they're basically the same method
   * with different names.
   *
   * @dataProvider providerEscapeMethods
   * @todo Separate test method for each escape method?
   */
  public function testEscapeMethods($expected, $name) {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    $connection = new StubConnection($mock_pdo, []);
    $this->assertEquals($expected, $connection->escapeDatabase($name));
    $this->assertEquals($expected, $connection->escapeTable($name));
    $this->assertEquals($expected, $connection->escapeField($name));
    $this->assertEquals($expected, $connection->escapeAlias($name));
  }

  /**
   * Dataprovider for testGetDriverClass().
   *
   * @return array
   *   Array of arrays with the following elements:
   *   - Expected namespaced class name.
   *   - Driver.
   *   - Namespace.
   *   - Class name without namespace.
   */
  public function providerGetDriverClass() {
    return [
      [
        'nonexistent_class',
        '\\',
        'nonexistent_class',
      ],
      [
        'Drupal\Tests\Core\Database\Stub\Select',
        NULL,
        'Select',
      ],
      [
        'Drupal\\Tests\\Core\\Database\\Stub\\Driver\\Schema',
        'Drupal\\Tests\\Core\\Database\\Stub\\Driver',
        'Schema',
      ],
    ];
  }

  /**
   * Test getDriverClass().
   *
   * @dataProvider providerGetDriverClass
   */
  public function testGetDriverClass($expected, $namespace, $class) {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    $connection = new StubConnection($mock_pdo, ['namespace' => $namespace]);
    // Set the driver using our stub class' public property.
    $this->assertEquals($expected, $connection->getDriverClass($class));
  }

  /**
   * Dataprovider for testSchema().
   *
   * @return array
   *   Array of arrays with the following elements:
   *   - Expected namespaced class of schema object.
   *   - Driver for PDO connection.
   *   - Namespace for connection.
   */
  public function providerSchema() {
    return [
      [
        'Drupal\\Tests\\Core\\Database\\Stub\\Driver\\Schema',
        'stub',
        'Drupal\\Tests\\Core\\Database\\Stub\\Driver',
      ],
    ];
  }

  /**
   * Test Connection::schema().
   *
   * @dataProvider providerSchema
   */
  public function testSchema($expected, $driver, $namespace) {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    $connection = new StubConnection($mock_pdo, ['namespace' => $namespace]);
    $connection->driver = $driver;
    $this->assertInstanceOf($expected, $connection->schema());
  }

  /**
   * Test Connection::destroy().
   */
  public function testDestroy() {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    // Mocking StubConnection gives us access to the $schema attribute.
    $connection = $this->getMock(
      'Drupal\Tests\Core\Database\Stub\StubConnection',
      NULL,
      [$mock_pdo, ['namespace' => 'Drupal\\Tests\\Core\\Database\\Stub\\Driver']]
    );
    // Generate a schema object in order to verify that we've NULLed it later.
    $this->assertInstanceOf(
      'Drupal\\Tests\\Core\\Database\\Stub\\Driver\\Schema',
      $connection->schema()
    );
    $connection->destroy();
    $this->assertAttributeEquals(NULL, 'schema', $connection);
  }

  /**
   * Dataprovider for testMakeComments().
   *
   * @return array
   *   Array of arrays with the following elements:
   *   - Expected filtered comment.
   *   - Arguments for Connection::makeComment().
   */
  public function providerMakeComments() {
    return [
      [
        '/*  */ ',
        [''],
      ],
      [
        '/* Exploit  *  / DROP TABLE node. -- */ ',
        ['Exploit * / DROP TABLE node; --'],
      ],
      [
        '/* Exploit  *  / DROP TABLE node. --. another comment */ ',
        ['Exploit * / DROP TABLE node; --', 'another comment'],
      ],
    ];
  }

  /**
   * Test Connection::makeComments().
   *
   * @dataProvider providerMakeComments
   */
  public function testMakeComments($expected, $comment_array) {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    $connection = new StubConnection($mock_pdo, []);
    $this->assertEquals($expected, $connection->makeComment($comment_array));
  }

  /**
   * Dataprovider for testFilterComments().
   *
   * @return array
   *   Array of arrays with the following elements:
   *   - Expected filtered comment.
   *   - Comment to filter.
   */
  public function providerFilterComments() {
    return [
      ['', ''],
      ['Exploit  *  / DROP TABLE node. --', 'Exploit * / DROP TABLE node; --'],
      ['Exploit  * / DROP TABLE node. --', 'Exploit */ DROP TABLE node; --'],
    ];
  }

  /**
   * Test Connection::filterComments().
   *
   * @dataProvider providerFilterComments
   */
  public function testFilterComments($expected, $comment) {
    $mock_pdo = $this->getMock('Drupal\Tests\Core\Database\Stub\StubPDO');
    $connection = new StubConnection($mock_pdo, []);

    // filterComment() is protected, so we make it accessible with reflection.
    $reflection = new \ReflectionClass('Drupal\Tests\Core\Database\Stub\StubConnection');
    $filter_comment = $reflection->getMethod('filterComment');
    $filter_comment->setAccessible(TRUE);

    $this->assertEquals(
      $expected,
      $filter_comment->invokeArgs($connection, [$comment])
    );
  }

}