class SchemaTest

class SchemaTest extends UnitTestCase {
  
  /**
   * The PostgreSql DB connection.
   *
   * @var \PHPUnit\Framework\MockObject\MockObject|\Drupal\pgsql\Driver\Database\pgsql\Connection
   */
  protected $connection;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->connection = $this->getMockBuilder('\\Drupal\\pgsql\\Driver\\Database\\pgsql\\Connection')
      ->disableOriginalConstructor()
      ->getMock();
  }
  
  /**
   * 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) {
    $max_identifier_length = 63;
    $schema = new Schema($this->connection);
    $statement = $this->createMock('\\Drupal\\Core\\Database\\StatementInterface');
    $statement->expects($this->any())
      ->method('fetchField')
      ->willReturn($max_identifier_length);
    $this->connection
      ->expects($this->exactly(2))
      ->method('query')
      ->withConsecutive([
      $this->anything(),
    ], [
      "SELECT 1 FROM pg_constraint WHERE conname = '{$expected}'",
    ])
      ->willReturnOnConsecutiveCalls($statement, $this->createMock('\\Drupal\\Core\\Database\\StatementInterface'));
    $schema->constraintExists($table_name, $name);
  }
  
  /**
   * Data provider for ::testComputedConstraintName().
   */
  public 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',
      ],
    ];
  }

}