class SchemaTest

class SchemaTest extends UnitTestCase {
  
  /**
   * Tests whether the actual constraint name is correctly computed.
   *
   * @param string $table_name
   *   The table name the constrained column belongs to.
   * @param string $name
   *   The constraint name.
   * @param string $expected
   *   The expected computed constraint name.
   *
   * @covers ::constraintExists
   * @dataProvider providerComputedConstraintName
   */
  public function testComputedConstraintName($table_name, $name, $expected) : void {
    $max_identifier_length = 63;
    $connection = $this->prophesize('\\Drupal\\pgsql\\Driver\\Database\\pgsql\\Connection');
    $connection->getConnectionOptions()
      ->willReturn([]);
    $connection->getPrefix()
      ->willReturn('');
    $statement = $this->prophesize('\\Drupal\\Core\\Database\\StatementInterface');
    $statement->fetchField()
      ->willReturn($max_identifier_length);
    $connection->query('SHOW max_identifier_length')
      ->willReturn($statement->reveal());
    $connection->query(Argument::containingString($expected))
      ->willReturn($this->prophesize('\\Drupal\\Core\\Database\\StatementInterface')
      ->reveal())
      ->shouldBeCalled();
    $schema = new Schema($connection->reveal());
    $schema->constraintExists($table_name, $name);
  }
  
  /**
   * Data provider for ::testComputedConstraintName().
   */
  public static function providerComputedConstraintName() {
    return [
      [
        'user_field_data',
        'pkey',
        'user_field_data____pkey',
      ],
      [
        'user_field_data',
        'name__key',
        'user_field_data__name__key',
      ],
      [
        'user_field_data',
        'a_very_very_very_very_super_long_field_name__key',
        'drupal_WW_a8TlbZ3UQi20UTtRlJFaIeSa6FEtQS5h4NRA3UeU_key',
      ],
    ];
  }

}