Issue #3108287 by Beakerboy, daffie: Remove, or mark as core only: testPrimaryKeyUpdate()

    $this->assertIdentical($num_rows, 5, 'Correctly returned 5 affected rows.');

  }

  /**

   * Confirm that we can update the primary key of a record successfully.

   */

  public function testPrimaryKeyUpdate() {

    $num_updated = $this->connection->update('test')

      ->fields(['id' => 42, 'name' => 'John'])

      ->condition('id', 1)

      ->execute();

    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');

    $saved_name = $this->connection->query('SELECT name FROM {test} WHERE id = :id', [':id' => 42])->fetchField();

    $this->assertIdentical($saved_name, 'John', 'Updated primary key successfully.');

  }

  /**

   * Confirm that we can update values in a column with special name.

   */