Revert "Issue #2223073 by stefan.r, superspring, Dave Reid, Jalandhar: Calling...

Revert "Issue #2223073 by stefan.r, superspring, Dave Reid, Jalandhar: Calling DatabaseSchema::getPrefixInfo() on a non-default connection returns the wrong database - write tests"

This reverts commit 2c2caccd.

core/tests/Drupal/KernelTests/Core/Database/PrefixInfoTest.php

-<?php
-
-namespace Drupal\KernelTests\Core\Database;
-
-use Drupal\Core\Database\Database;
-
-/**
- * Tests that the prefix info for a database schema is correct.
- *
- * @group Database
- */
-class PrefixInfoTest extends DatabaseTestBase {
-
-  /**
-   * Tests that DatabaseSchema::getPrefixInfo() returns the right database.
-   */
-  public function testGetPrefixInfo() {
-    $connection_info = Database::getConnectionInfo('default');
-    // Copy the default connection info to the 'extra' key.
-    Database::addConnectionInfo('extra', 'default', $connection_info['default']);
-
-    $db1_connection = Database::getConnection('default', 'default');
-    $db1_schema = $db1_connection->schema();
-    $db2_connection = Database::getConnection('default', 'extra');
-
-    // Get the prefix info for the first databse.
-    $method = new \ReflectionMethod($db1_schema, 'getPrefixInfo');
-    $method->setAccessible(TRUE);
-    $db1_info = $method->invoke($db1_schema);
-
-    // We change the database after opening the connection, so as to prevent
-    // connecting to a non-existent database.
-    $reflection = new \ReflectionObject($db2_connection);
-    $property = $reflection->getProperty('connectionOptions');
-    $property->setAccessible(TRUE);
-    $connection_info['default']['database'] = 'foobar';
-    $property->setValue($db2_connection, $connection_info['default']);
-
-    // For testing purposes, we also change the database info.
-    $reflection_class = new \ReflectionClass('Drupal\Core\Database\Database');
-    $property = $reflection_class->getProperty('databaseInfo');
-    $property->setAccessible(TRUE);
-    $info = $property->getValue();
-    $info['extra']['default']['database'] = 'foobar';
-    $property->setValue(NULL, $info);
-
-    $extra_info = Database::getConnectionInfo('extra');
-    $this->assertSame($extra_info['default']['database'], 'foobar');
-    $db2_schema = $db2_connection->schema();
-    $db2_info = $method->invoke($db2_schema);
-
-    $this->assertNotSame($db2_info['database'], $db1_info['database'], 'Each target connection has a different database.');
-    $this->assertSame($db2_info['database'], 'foobar', 'The new profile has a different database.');
-
-    Database::removeConnection('extra');
-  }
-
-}