first commit

core/modules/pgsql/tests/fixtures/update/drupal-9.pgsql-orphan-sequence.php

@@ -0,0 +1,43 @@
+<?php
+// @codingStandardsIgnoreFile
+
+use Drupal\Core\Database\Database;
+
+$connection = Database::getConnection();
+$db_type = $connection->databaseType();
+
+// Creates a table, then adds a sequence without ownership to simulate tables
+// that were altered from integer to serial columns.
+$connection
+  ->schema()
+  ->createTable('pgsql_sequence_test', [
+    'fields' => [
+      'sequence_field' => [
+        'type' => 'int',
+        'not null' => TRUE,
+        'unsigned' => TRUE,
+      ],
+    ],
+    'primary key' => ['sequence_field'],
+  ]);
+$seq = $connection
+  ->makeSequenceName('pgsql_sequence_test', 'sequence_field');
+$connection->query('CREATE SEQUENCE ' . $seq);
+
+// Enables the pgsql_test module so that the pgsql_sequence_test schema will
+// be available.
+$extensions = $connection
+  ->query("SELECT data FROM {config} where name = 'core.extension'")
+  ->fetchField();
+$extensions = unserialize($extensions);
+$extensions['module']['pgsql_test'] = 1;
+
+$connection
+  ->update('config')
+  ->fields(['data' => serialize($extensions)])
+  ->condition('name', 'core.extension')
+  ->execute();
+$connection
+  ->delete('cache_config')
+  ->condition('cid', 'core.extension')
+  ->execute();

core/modules/pgsql/tests/src/Functional/Database/PostgreSqlSequenceUpdateTest.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Functional\Database;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+use Drupal\Core\Database\Database;
+use Drupal\pgsql\Update10101;
+
+// cSpell:ignore objid refobjid regclass attname attrelid attnum refobjsubid
+
+/**
+ * Tests that any unowned sequences created previously have a table owner.
+ *
+ * The update path only applies to Drupal sites using the pgsql driver.
+ *
+ * @group Database
+ */
+class PostgreSqlSequenceUpdateTest extends UpdatePathTestBase {
+
+  /**
+   * The database connection to use.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function runDbTasks() {
+    parent::runDbTasks();
+    $this->connection = Database::getConnection();
+    if ($this->connection->driver() !== 'pgsql') {
+      $this->markTestSkipped('This test only works with the pgsql driver');
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setDatabaseDumpFiles() {
+    $this->databaseDumpFiles = [
+      __DIR__ . '/../../../../../system/tests/fixtures/update/drupal-9.4.0.bare.standard.php.gz',
+      __DIR__ . '/../../../fixtures/update/drupal-9.pgsql-orphan-sequence.php',
+    ];
+  }
+
+  /**
+   * Asserts that a newly created sequence has the correct ownership.
+   */
+  public function testPostgreSqlSequenceUpdate(): void {
+    $this->assertFalse($this->getSequenceOwner('pgsql_sequence_test', 'sequence_field'));
+
+    // Run the updates.
+    $this->runUpdates();
+
+    $seq_owner = $this->getSequenceOwner('pgsql_sequence_test', 'sequence_field');
+    $this->assertEquals($this->connection->getPrefix() . 'pgsql_sequence_test', $seq_owner->table_name);
+    $this->assertEquals('sequence_field', $seq_owner->field_name, 'Sequence is owned by the table and column.');
+  }
+
+  /**
+   * Retrieves the sequence owner object.
+   *
+   * @return object|bool
+   *   Returns the sequence owner object or bool if it does not exist.
+   */
+  protected function getSequenceOwner(string $table, string $field): object|bool {
+    $update_sequence = \Drupal::classResolver(Update10101::class);
+    $seq_name = $update_sequence->getSequenceName($table, $field);
+    return \Drupal::database()->query("SELECT d.refobjid::regclass as table_name, a.attname as field_name
+      FROM pg_depend d
+      JOIN pg_attribute a ON a.attrelid = d.refobjid AND a.attnum = d.refobjsubid
+      WHERE d.objid = :seq_name::regclass
+      AND d.refobjsubid > 0
+      AND d.classid = 'pg_class'::regclass", [':seq_name' => $seq_name])->fetchObject();
+  }
+
+}

core/modules/pgsql/tests/src/Functional/GenericTest.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Functional;
+
+use Drupal\Tests\system\Functional\Module\GenericModuleTestBase;
+
+/**
+ * Generic module test for pgsql.
+ *
+ * @group pgsql
+ */
+class GenericTest extends GenericModuleTestBase {}

core/modules/pgsql/tests/src/Kernel/pgsql/ConnectionUnitTest.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\DriverSpecificConnectionUnitTestBase;
+
+/**
+ * PostgreSQL-specific connection unit tests.
+ *
+ * @group Database
+ */
+class ConnectionUnitTest extends DriverSpecificConnectionUnitTestBase {
+
+  /**
+   * Returns a set of queries specific for PostgreSQL.
+   */
+  protected function getQuery(): array {
+    return [
+      'connection_id' => 'SELECT pg_backend_pid()',
+      'processlist' => 'SELECT pid FROM pg_stat_activity',
+      'show_tables' => 'SELECT * FROM pg_catalog.pg_tables',
+    ];
+  }
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/DatabaseExceptionWrapperTest.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\DriverSpecificKernelTestBase;
+
+/**
+ * Tests exceptions thrown by queries.
+ *
+ * @group Database
+ */
+class DatabaseExceptionWrapperTest extends DriverSpecificKernelTestBase {
+
+  /**
+   * Tests Connection::prepareStatement exception on execution.
+   */
+  public function testPrepareStatementFailOnExecution(): void {
+    $this->expectException(\PDOException::class);
+    $stmt = $this->connection->prepareStatement('bananas', []);
+    $stmt->execute();
+  }
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/KernelTestBaseTest.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\DriverSpecificKernelTestBase;
+
+/**
+ * @coversDefaultClass \Drupal\KernelTests\KernelTestBase
+ *
+ * @group KernelTests
+ * @group Database
+ */
+class KernelTestBaseTest extends DriverSpecificKernelTestBase {
+
+  /**
+   * @covers ::setUp
+   */
+  public function testSetUp(): void {
+    // Ensure that the database tasks have been run during set up.
+    $this->assertSame('on', $this->connection->query("SHOW standard_conforming_strings")->fetchField());
+    $this->assertSame('escape', $this->connection->query("SHOW bytea_output")->fetchField());
+  }
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/NonPublicSchemaTest.php

@@ -0,0 +1,363 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\Core\Database\Database;
+use Drupal\Core\Database\Connection;
+use Drupal\KernelTests\Core\Database\DatabaseTestSchemaDataTrait;
+use Drupal\KernelTests\Core\Database\DatabaseTestSchemaInstallTrait;
+use Drupal\KernelTests\Core\Database\DriverSpecificKernelTestBase;
+
+// cSpell:ignore nspname schemaname upserting indexdef
+
+/**
+ * Tests schema API for non-public schema for the PostgreSQL driver.
+ *
+ * @group Database
+ * @coversDefaultClass \Drupal\pgsql\Driver\Database\pgsql\Schema
+ */
+class NonPublicSchemaTest extends DriverSpecificKernelTestBase {
+
+  use DatabaseTestSchemaDataTrait;
+  use DatabaseTestSchemaInstallTrait;
+
+  /**
+   * The database connection for testing.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected Connection $testingFakeConnection;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    // Create a connection to the non-public schema.
+    $info = Database::getConnectionInfo('default');
+    $info['default']['schema'] = 'testing_fake';
+    Database::getConnection()->query('CREATE SCHEMA IF NOT EXISTS testing_fake');
+    Database::addConnectionInfo('default', 'testing_fake', $info['default']);
+
+    $this->testingFakeConnection = Database::getConnection('testing_fake', 'default');
+
+    $table_specification = [
+      'description' => 'Schema table description may contain "quotes" and could be long—very long indeed.',
+      'fields' => [
+        'id'  => [
+          'type' => 'serial',
+          'not null' => TRUE,
+        ],
+        'test_field'  => [
+          'type' => 'int',
+          'not null' => TRUE,
+        ],
+      ],
+      'primary key' => ['id'],
+    ];
+
+    $this->testingFakeConnection->schema()->createTable('faking_table', $table_specification);
+
+    $this->testingFakeConnection->insert('faking_table')
+      ->fields(
+        [
+          'id' => '1',
+          'test_field' => '123',
+        ]
+      )->execute();
+
+    $this->testingFakeConnection->insert('faking_table')
+      ->fields(
+        [
+          'id' => '2',
+          'test_field' => '456',
+        ]
+      )->execute();
+
+    $this->testingFakeConnection->insert('faking_table')
+      ->fields(
+        [
+          'id' => '3',
+          'test_field' => '789',
+        ]
+      )->execute();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function tearDown(): void {
+    // We overwrite this function because the regular teardown will not drop the
+    // tables from a specified schema.
+    $tables = $this->testingFakeConnection->schema()->findTables('%');
+    foreach ($tables as $table) {
+      if ($this->testingFakeConnection->schema()->dropTable($table)) {
+        unset($tables[$table]);
+      }
+    }
+
+    $this->assertEmpty($this->testingFakeConnection->schema()->findTables('%'));
+
+    Database::removeConnection('testing_fake');
+
+    parent::tearDown();
+  }
+
+  /**
+   * @covers ::extensionExists
+   * @covers ::tableExists
+   */
+  public function testExtensionExists(): void {
+    // Check if PG_trgm extension is present.
+    $this->assertTrue($this->testingFakeConnection->schema()->extensionExists('pg_trgm'));
+    // Asserting that the Schema testing_fake exist in the database.
+    $this->assertCount(1, \Drupal::database()->query("SELECT * FROM pg_catalog.pg_namespace WHERE nspname = 'testing_fake'")->fetchAll());
+    $this->assertTrue($this->testingFakeConnection->schema()->tableExists('faking_table'));
+
+    // Hardcoded assertion that we created the table in the non-public schema.
+    $this->assertCount(1, $this->testingFakeConnection->query("SELECT * FROM pg_tables WHERE schemaname = 'testing_fake' AND tablename = :prefixedTable", [':prefixedTable' => $this->testingFakeConnection->getPrefix() . "faking_table"])->fetchAll());
+  }
+
+  /**
+   * @covers ::addField
+   * @covers ::fieldExists
+   * @covers ::dropField
+   * @covers ::changeField
+   */
+  public function testField(): void {
+    $this->testingFakeConnection->schema()->addField('faking_table', 'added_field', ['type' => 'int', 'not null' => FALSE]);
+    $this->assertTrue($this->testingFakeConnection->schema()->fieldExists('faking_table', 'added_field'));
+
+    $this->testingFakeConnection->schema()->changeField('faking_table', 'added_field', 'changed_field', ['type' => 'int', 'not null' => FALSE]);
+    $this->assertFalse($this->testingFakeConnection->schema()->fieldExists('faking_table', 'added_field'));
+    $this->assertTrue($this->testingFakeConnection->schema()->fieldExists('faking_table', 'changed_field'));
+
+    $this->testingFakeConnection->schema()->dropField('faking_table', 'changed_field');
+    $this->assertFalse($this->testingFakeConnection->schema()->fieldExists('faking_table', 'changed_field'));
+  }
+
+  /**
+   * @covers \Drupal\Core\Database\Connection::insert
+   * @covers \Drupal\Core\Database\Connection::select
+   */
+  public function testInsert(): void {
+    $num_records_before = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+
+    $this->testingFakeConnection->insert('faking_table')
+      ->fields([
+        'id' => '123',
+        'test_field' => '55',
+      ])->execute();
+
+    // Testing that the insert is correct.
+    $results = $this->testingFakeConnection->select('faking_table')->fields('faking_table')->condition('id', '123')->execute()->fetchAll();
+    $this->assertIsArray($results);
+
+    $num_records_after = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+    $this->assertEquals($num_records_before + 1, $num_records_after, 'Merge inserted properly.');
+
+    $this->assertSame('123', $results[0]->id);
+    $this->assertSame('55', $results[0]->test_field);
+  }
+
+  /**
+   * @covers \Drupal\Core\Database\Connection::update
+   */
+  public function testUpdate(): void {
+    $updated_record = $this->testingFakeConnection->update('faking_table')
+      ->fields(['test_field' => 321])
+      ->condition('id', 1)
+      ->execute();
+
+    $this->assertSame(1, $updated_record, 'Updated 1 record.');
+
+    $updated_results = $this->testingFakeConnection->select('faking_table')->fields('faking_table')->condition('id', '1')->execute()->fetchAll();
+
+    $this->assertSame('321', $updated_results[0]->test_field);
+  }
+
+  /**
+   * @covers \Drupal\Core\Database\Connection::upsert
+   */
+  public function testUpsert(): void {
+    $num_records_before = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+
+    $upsert = $this->testingFakeConnection->upsert('faking_table')
+      ->key('id')
+      ->fields(['id', 'test_field']);
+
+    // Upserting a new row.
+    $upsert->values([
+      'id' => '456',
+      'test_field' => '444',
+    ]);
+
+    // Upserting an existing row.
+    $upsert->values([
+      'id' => '1',
+      'test_field' => '898',
+    ]);
+
+    $result = $upsert->execute();
+    $this->assertSame(2, $result, 'The result of the upsert operation should report that at exactly two rows were affected.');
+
+    $num_records_after = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+    $this->assertEquals($num_records_before + 1, $num_records_after, 'Merge inserted properly.');
+
+    // Check if new row has been added with upsert.
+    $result = $this->testingFakeConnection->query('SELECT * FROM {faking_table} WHERE [id] = :id', [':id' => '456'])->fetch();
+    $this->assertEquals('456', $result->id, 'ID set correctly.');
+    $this->assertEquals('444', $result->test_field, 'test_field set correctly.');
+
+    // Check if new row has been edited with upsert.
+    $result = $this->testingFakeConnection->query('SELECT * FROM {faking_table} WHERE [id] = :id', [':id' => '1'])->fetch();
+    $this->assertEquals('1', $result->id, 'ID set correctly.');
+    $this->assertEquals('898', $result->test_field, 'test_field set correctly.');
+  }
+
+  /**
+   * @covers \Drupal\Core\Database\Connection::merge
+   */
+  public function testMerge(): void {
+    $num_records_before = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+
+    $this->testingFakeConnection->merge('faking_table')
+      ->key('id', '789')
+      ->fields([
+        'test_field' => 343,
+      ])
+      ->execute();
+
+    $num_records_after = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+    $this->assertEquals($num_records_before + 1, $num_records_after, 'Merge inserted properly.');
+
+    $merge_results = $this->testingFakeConnection->select('faking_table')->fields('faking_table')->condition('id', '789')->execute()->fetchAll();
+    $this->assertSame('789', $merge_results[0]->id);
+    $this->assertSame('343', $merge_results[0]->test_field);
+  }
+
+  /**
+   * @covers \Drupal\Core\Database\Connection::delete
+   * @covers \Drupal\Core\Database\Connection::truncate
+   */
+  public function testDelete(): void {
+    $num_records_before = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+
+    $num_deleted = $this->testingFakeConnection->delete('faking_table')
+      ->condition('id', 3)
+      ->execute();
+    $this->assertSame(1, $num_deleted, 'Deleted 1 record.');
+
+    $num_records_after = $this->testingFakeConnection->query('SELECT COUNT(*) FROM {faking_table}')->fetchField();
+    $this->assertEquals($num_records_before, $num_records_after + $num_deleted, 'Deletion adds up.');
+
+    $num_records_before = $this->testingFakeConnection->query("SELECT COUNT(*) FROM {faking_table}")->fetchField();
+    $this->assertNotEmpty($num_records_before);
+
+    $this->testingFakeConnection->truncate('faking_table')->execute();
+
+    $num_records_after = $this->testingFakeConnection->query("SELECT COUNT(*) FROM {faking_table}")->fetchField();
+    $this->assertEquals(0, $num_records_after, 'Truncate really deletes everything.');
+  }
+
+  /**
+   * @covers ::addIndex
+   * @covers ::indexExists
+   * @covers ::dropIndex
+   */
+  public function testIndex(): void {
+    $this->testingFakeConnection->schema()->addIndex('faking_table', 'test_field', ['test_field'], []);
+
+    $this->assertTrue($this->testingFakeConnection->schema()->indexExists('faking_table', 'test_field'));
+
+    $results = $this->testingFakeConnection->query("SELECT * FROM pg_indexes WHERE indexname = :indexname", [':indexname' => $this->testingFakeConnection->getPrefix() . 'faking_table__test_field__idx'])->fetchAll();
+
+    $this->assertCount(1, $results);
+    $this->assertSame('testing_fake', $results[0]->schemaname);
+    $this->assertSame($this->testingFakeConnection->getPrefix() . 'faking_table', $results[0]->tablename);
+    $this->assertStringContainsString('USING btree (test_field)', $results[0]->indexdef);
+
+    $this->testingFakeConnection->schema()->dropIndex('faking_table', 'test_field');
+
+    $this->assertFalse($this->testingFakeConnection->schema()->indexExists('faking_table', 'test_field'));
+  }
+
+  /**
+   * @covers ::addUniqueKey
+   * @covers ::indexExists
+   * @covers ::dropUniqueKey
+   */
+  public function testUniqueKey(): void {
+    $this->testingFakeConnection->schema()->addUniqueKey('faking_table', 'test_field', ['test_field']);
+
+    // This should work, but currently indexExist() only searches for keys that end with idx.
+    // @todo remove comments when: https://www.drupal.org/project/drupal/issues/3325358 is committed.
+    // $this->assertTrue($this->testingFakeConnection->schema()->indexExists('faking_table', 'test_field'));
+
+    $results = $this->testingFakeConnection->query("SELECT * FROM pg_indexes WHERE indexname = :indexname", [':indexname' => $this->testingFakeConnection->getPrefix() . 'faking_table__test_field__key'])->fetchAll();
+
+    // Check the unique key columns.
+    $this->assertCount(1, $results);
+    $this->assertSame('testing_fake', $results[0]->schemaname);
+    $this->assertSame($this->testingFakeConnection->getPrefix() . 'faking_table', $results[0]->tablename);
+    $this->assertStringContainsString('USING btree (test_field)', $results[0]->indexdef);
+
+    $this->testingFakeConnection->schema()->dropUniqueKey('faking_table', 'test_field');
+
+    // This function will not work due to a the fact that indexExist() does not search for keys without idx tag.
+    // @todo remove comments when: https://www.drupal.org/project/drupal/issues/3325358 is committed.
+    // $this->assertFalse($this->testingFakeConnection->schema()->indexExists('faking_table', 'test_field'));
+  }
+
+  /**
+   * @covers ::addPrimaryKey
+   * @covers ::dropPrimaryKey
+   */
+  public function testPrimaryKey(): void {
+    $this->testingFakeConnection->schema()->dropPrimaryKey('faking_table');
+    $results = $this->testingFakeConnection->query("SELECT * FROM pg_indexes WHERE schemaname = 'testing_fake'")->fetchAll();
+
+    $this->assertCount(0, $results);
+
+    $this->testingFakeConnection->schema()->addPrimaryKey('faking_table', ['id']);
+    $results = $this->testingFakeConnection->query("SELECT * FROM pg_indexes WHERE schemaname = 'testing_fake'")->fetchAll();
+
+    $this->assertCount(1, $results);
+    $this->assertSame('testing_fake', $results[0]->schemaname);
+    $this->assertSame($this->testingFakeConnection->getPrefix() . 'faking_table', $results[0]->tablename);
+    $this->assertStringContainsString('USING btree (id)', $results[0]->indexdef);
+
+    $find_primary_keys_columns = new \ReflectionMethod(get_class($this->testingFakeConnection->schema()), 'findPrimaryKeyColumns');
+    $results = $find_primary_keys_columns->invoke($this->testingFakeConnection->schema(), 'faking_table');
+
+    $this->assertCount(1, $results);
+    $this->assertSame('id', $results[0]);
+  }
+
+  /**
+   * @covers ::renameTable
+   * @covers ::tableExists
+   * @covers ::findTables
+   * @covers ::dropTable
+   */
+  public function testTable(): void {
+    $this->testingFakeConnection->schema()->renameTable('faking_table', 'new_faking_table');
+
+    $tables = $this->testingFakeConnection->schema()->findTables('%');
+    $result = $this->testingFakeConnection->query("SELECT * FROM information_schema.tables WHERE table_schema = 'testing_fake'")->fetchAll();
+    $this->assertFalse($this->testingFakeConnection->schema()->tableExists('faking_table'));
+    $this->assertTrue($this->testingFakeConnection->schema()->tableExists('new_faking_table'));
+    $this->assertEquals($this->testingFakeConnection->getPrefix() . 'new_faking_table', $result[0]->table_name);
+    $this->assertEquals('testing_fake', $result[0]->table_schema);
+    sort($tables);
+    $this->assertEquals(['new_faking_table'], $tables);
+
+    $this->testingFakeConnection->schema()->dropTable('new_faking_table');
+    $this->assertFalse($this->testingFakeConnection->schema()->tableExists('new_faking_table'));
+    $this->assertCount(0, $this->testingFakeConnection->query("SELECT * FROM information_schema.tables WHERE table_schema = 'testing_fake'")->fetchAll());
+  }
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/PgsqlDriverLegacyTest.php

@@ -0,0 +1,108 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\Core\Database\Driver\pgsql\Connection;
+use Drupal\Core\Database\Driver\pgsql\Delete;
+use Drupal\Core\Database\Driver\pgsql\Install\Tasks;
+use Drupal\Core\Database\Driver\pgsql\Insert;
+use Drupal\Core\Database\Driver\pgsql\Schema;
+use Drupal\Core\Database\Driver\pgsql\Select;
+use Drupal\Core\Database\Driver\pgsql\Truncate;
+use Drupal\Core\Database\Driver\pgsql\Update;
+use Drupal\Core\Database\Driver\pgsql\Upsert;
+use Drupal\KernelTests\Core\Database\DriverSpecificDatabaseTestBase;
+use Drupal\Tests\Core\Database\Stub\StubPDO;
+
+/**
+ * Tests the deprecations of the PostgreSQL database driver classes in Core.
+ *
+ * @group legacy
+ * @group Database
+ */
+class PgsqlDriverLegacyTest extends DriverSpecificDatabaseTestBase {
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Install\Tasks
+   */
+  public function testDeprecationInstallTasks(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Install\Tasks is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $tasks = new Tasks();
+    $this->assertInstanceOf(Tasks::class, $tasks);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Connection
+   */
+  public function testDeprecationConnection(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Connection is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $connection = new Connection($this->createMock(StubPDO::class), []);
+    $this->assertInstanceOf(Connection::class, $connection);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Delete
+   */
+  public function testDeprecationDelete(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Delete is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $delete = new Delete($this->connection, 'test');
+    $this->assertInstanceOf(Delete::class, $delete);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Insert
+   */
+  public function testDeprecationInsert(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Insert is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $insert = new Insert($this->connection, 'test');
+    $this->assertInstanceOf(Insert::class, $insert);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Schema
+   */
+  public function testDeprecationSchema(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Schema is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $schema = new Schema($this->connection);
+    $this->assertInstanceOf(Schema::class, $schema);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Select
+   */
+  public function testDeprecationSelect(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Select is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $select = new Select($this->connection, 'test');
+    $this->assertInstanceOf(Select::class, $select);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Truncate
+   */
+  public function testDeprecationTruncate(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Truncate is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $truncate = new Truncate($this->connection, 'test');
+    $this->assertInstanceOf(Truncate::class, $truncate);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Update
+   */
+  public function testDeprecationUpdate(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Update is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $update = new Update($this->connection, 'test');
+    $this->assertInstanceOf(Update::class, $update);
+  }
+
+  /**
+   * @covers Drupal\Core\Database\Driver\pgsql\Upsert
+   */
+  public function testDeprecationUpsert(): void {
+    $this->expectDeprecation('\Drupal\Core\Database\Driver\pgsql\Upsert is deprecated in drupal:9.4.0 and is removed from drupal:11.0.0. The PostgreSQL database driver has been moved to the pgsql module. See https://www.drupal.org/node/3129492');
+    $upsert = new Upsert($this->connection, 'test');
+    $this->assertInstanceOf(Upsert::class, $upsert);
+  }
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/Plugin/views/PgsqlCastedIntFieldJoinTest.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql\Plugin\views;
+
+use Drupal\Tests\views\Kernel\Plugin\CastedIntFieldJoinTestBase;
+
+/**
+ * Tests PostgreSQL specific cast handling.
+ *
+ * @group Database
+ */
+class PgsqlCastedIntFieldJoinTest extends CastedIntFieldJoinTestBase {
+
+  /**
+   * The db type that should be used for casting fields as integers.
+   */
+  protected string $castingType = 'INTEGER';
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/SchemaTest.php

@@ -0,0 +1,386 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\DriverSpecificSchemaTestBase;
+
+// cSpell:ignore relkind objid refobjid regclass attname attrelid attnum
+// cSpell:ignore refobjsubid
+
+/**
+ * Tests schema API for the PostgreSQL driver.
+ *
+ * @group Database
+ */
+class SchemaTest extends DriverSpecificSchemaTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function checkSchemaComment(string $description, string $table, ?string $column = NULL): void {
+    $this->assertSame($description, $this->schema->getComment($table, $column), 'The comment matches the schema description.');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkSequenceRenaming(string $tableName): void {
+    // For PostgreSQL, we also need to check that the sequence has been renamed.
+    // The initial name of the sequence has been generated automatically by
+    // PostgreSQL when the table was created, however, on subsequent table
+    // renames the name is generated by Drupal and can not be easily
+    // re-constructed. Hence we can only check that we still have a sequence on
+    // the new table name.
+    $sequenceExists = (bool) $this->connection->query("SELECT pg_get_serial_sequence('{" . $tableName . "}', 'id')")->fetchField();
+    $this->assertTrue($sequenceExists, 'Sequence was renamed.');
+
+    // Rename the table again and repeat the check.
+    $anotherTableName = strtolower($this->getRandomGenerator()->name(63 - strlen($this->getDatabasePrefix())));
+    $this->schema->renameTable($tableName, $anotherTableName);
+
+    $sequenceExists = (bool) $this->connection->query("SELECT pg_get_serial_sequence('{" . $anotherTableName . "}', 'id')")->fetchField();
+    $this->assertTrue($sequenceExists, 'Sequence was renamed.');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function testTableWithSpecificDataType(): void {
+    $table_specification = [
+      'description' => 'Schema table description.',
+      'fields' => [
+        'timestamp'  => [
+          'pgsql_type' => 'timestamp',
+          'not null' => FALSE,
+          'default' => NULL,
+        ],
+      ],
+    ];
+    $this->schema->createTable('test_timestamp', $table_specification);
+    $this->assertTrue($this->schema->tableExists('test_timestamp'));
+  }
+
+  /**
+   * @covers \Drupal\pgsql\Driver\Database\pgsql\Schema::introspectIndexSchema
+   */
+  public function testIntrospectIndexSchema(): void {
+    $table_specification = [
+      'fields' => [
+        'id'  => [
+          'type' => 'int',
+          'not null' => TRUE,
+          'default' => 0,
+        ],
+        'test_field_1'  => [
+          'type' => 'int',
+          'not null' => TRUE,
+          'default' => 0,
+        ],
+        'test_field_2'  => [
+          'type' => 'int',
+          'default' => 0,
+        ],
+        'test_field_3'  => [
+          'type' => 'int',
+          'default' => 0,
+        ],
+        'test_field_4'  => [
+          'type' => 'int',
+          'default' => 0,
+        ],
+        'test_field_5'  => [
+          'type' => 'int',
+          'default' => 0,
+        ],
+      ],
+      'primary key' => ['id', 'test_field_1'],
+      'unique keys' => [
+        'test_field_2' => ['test_field_2'],
+        'test_field_3_test_field_4' => ['test_field_3', 'test_field_4'],
+      ],
+      'indexes' => [
+        'test_field_4' => ['test_field_4'],
+        'test_field_4_test_field_5' => ['test_field_4', 'test_field_5'],
+      ],
+    ];
+
+    $table_name = strtolower($this->getRandomGenerator()->name());
+    $this->schema->createTable($table_name, $table_specification);
+
+    unset($table_specification['fields']);
+
+    $introspect_index_schema = new \ReflectionMethod(get_class($this->schema), 'introspectIndexSchema');
+    $index_schema = $introspect_index_schema->invoke($this->schema, $table_name);
+
+    // The PostgreSQL driver is using a custom naming scheme for its indexes, so
+    // we need to adjust the initial table specification.
+    $ensure_identifier_length = new \ReflectionMethod(get_class($this->schema), 'ensureIdentifiersLength');
+
+    foreach ($table_specification['unique keys'] as $original_index_name => $columns) {
+      unset($table_specification['unique keys'][$original_index_name]);
+      $new_index_name = $ensure_identifier_length->invoke($this->schema, $table_name, $original_index_name, 'key');
+      $table_specification['unique keys'][$new_index_name] = $columns;
+    }
+
+    foreach ($table_specification['indexes'] as $original_index_name => $columns) {
+      unset($table_specification['indexes'][$original_index_name]);
+      $new_index_name = $ensure_identifier_length->invoke($this->schema, $table_name, $original_index_name, 'idx');
+      $table_specification['indexes'][$new_index_name] = $columns;
+    }
+
+    $this->assertEquals($table_specification, $index_schema);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function testReservedKeywordsForNaming(): void {
+    $table_specification = [
+      'description' => 'A test table with an ANSI reserved keywords for naming.',
+      'fields' => [
+        'primary' => [
+          'description' => 'Simple unique ID.',
+          'type' => 'int',
+          'not null' => TRUE,
+        ],
+        'update' => [
+          'description' => 'A column with reserved name.',
+          'type' => 'varchar',
+          'length' => 255,
+        ],
+      ],
+      'primary key' => ['primary'],
+      'unique keys' => [
+        'having' => ['update'],
+      ],
+      'indexes' => [
+        'in' => ['primary', 'update'],
+      ],
+    ];
+
+    // Creating a table.
+    $table_name = 'select';
+    $this->schema->createTable($table_name, $table_specification);
+    $this->assertTrue($this->schema->tableExists($table_name));
+
+    // Finding all tables.
+    $tables = $this->schema->findTables('%');
+    sort($tables);
+    $this->assertEquals(['config', 'select'], $tables);
+
+    // Renaming a table.
+    $table_name_new = 'from';
+    $this->schema->renameTable($table_name, $table_name_new);
+    $this->assertFalse($this->schema->tableExists($table_name));
+    $this->assertTrue($this->schema->tableExists($table_name_new));
+
+    // Adding a field.
+    $field_name = 'delete';
+    $this->schema->addField($table_name_new, $field_name, ['type' => 'int', 'not null' => TRUE]);
+    $this->assertTrue($this->schema->fieldExists($table_name_new, $field_name));
+
+    // Dropping a primary key.
+    $this->schema->dropPrimaryKey($table_name_new);
+
+    // Adding a primary key.
+    $this->schema->addPrimaryKey($table_name_new, [$field_name]);
+
+    // Check the primary key columns.
+    $find_primary_key_columns = new \ReflectionMethod(get_class($this->schema), 'findPrimaryKeyColumns');
+    $this->assertEquals([$field_name], $find_primary_key_columns->invoke($this->schema, $table_name_new));
+
+    // Dropping a primary key.
+    $this->schema->dropPrimaryKey($table_name_new);
+
+    // Changing a field.
+    $field_name_new = 'where';
+    $this->schema->changeField($table_name_new, $field_name, $field_name_new, ['type' => 'int', 'not null' => FALSE]);
+    $this->assertFalse($this->schema->fieldExists($table_name_new, $field_name));
+    $this->assertTrue($this->schema->fieldExists($table_name_new, $field_name_new));
+
+    // Adding an unique key
+    $unique_key_name = $unique_key_introspect_name = 'unique';
+    $this->schema->addUniqueKey($table_name_new, $unique_key_name, [$field_name_new]);
+
+    // Check the unique key columns.
+    $introspect_index_schema = new \ReflectionMethod(get_class($this->schema), 'introspectIndexSchema');
+    $ensure_identifiers_length = new \ReflectionMethod(get_class($this->schema), 'ensureIdentifiersLength');
+    $unique_key_introspect_name = $ensure_identifiers_length->invoke($this->schema, $table_name_new, $unique_key_name, 'key');
+    $this->assertEquals([$field_name_new], $introspect_index_schema->invoke($this->schema, $table_name_new)['unique keys'][$unique_key_introspect_name]);
+
+    // Dropping an unique key
+    $this->schema->dropUniqueKey($table_name_new, $unique_key_name);
+
+    // Dropping a field.
+    $this->schema->dropField($table_name_new, $field_name_new);
+    $this->assertFalse($this->schema->fieldExists($table_name_new, $field_name_new));
+
+    // Adding an index.
+    $index_name = $index_introspect_name = 'index';
+    $this->schema->addIndex($table_name_new, $index_name, ['update'], $table_specification);
+    $this->assertTrue($this->schema->indexExists($table_name_new, $index_name));
+
+    // Check the index columns.
+    $index_introspect_name = $ensure_identifiers_length->invoke($this->schema, $table_name_new, $index_name, 'idx');
+    $this->assertEquals(['update'], $introspect_index_schema->invoke($this->schema, $table_name_new)['indexes'][$index_introspect_name]);
+
+    // Dropping an index.
+    $this->schema->dropIndex($table_name_new, $index_name);
+    $this->assertFalse($this->schema->indexExists($table_name_new, $index_name));
+
+    // Dropping a table.
+    $this->schema->dropTable($table_name_new);
+    $this->assertFalse($this->schema->tableExists($table_name_new));
+  }
+
+  /**
+   * @covers \Drupal\Core\Database\Driver\pgsql\Schema::extensionExists
+   */
+  public function testPgsqlExtensionExists(): void {
+    // Test the method for a non existing extension.
+    $this->assertFalse($this->schema->extensionExists('non_existing_extension'));
+
+    // Test the method for an existing extension.
+    $this->assertTrue($this->schema->extensionExists('pg_trgm'));
+  }
+
+  /**
+   * Tests if the new sequences get the right ownership.
+   */
+  public function testPgsqlSequences(): void {
+    $table_specification = [
+      'description' => 'A test table with an ANSI reserved keywords for naming.',
+      'fields' => [
+        'uid' => [
+          'description' => 'Simple unique ID.',
+          'type' => 'serial',
+          'not null' => TRUE,
+        ],
+        'update' => [
+          'description' => 'A column with reserved name.',
+          'type' => 'varchar',
+          'length' => 255,
+        ],
+      ],
+      'primary key' => ['uid'],
+      'unique keys' => [
+        'having' => ['update'],
+      ],
+      'indexes' => [
+        'in' => ['uid', 'update'],
+      ],
+    ];
+
+    // Creating a table.
+    $table_name = 'sequence_test';
+    $this->schema->createTable($table_name, $table_specification);
+    $this->assertTrue($this->schema->tableExists($table_name));
+
+    // Retrieves a sequence name that is owned by the table and column.
+    $sequence_name = $this->connection
+      ->query("SELECT pg_get_serial_sequence(:table, :column)", [
+        ':table' => $this->connection->getPrefix() . 'sequence_test',
+        ':column' => 'uid',
+      ])
+      ->fetchField();
+
+    $schema = $this->connection->getConnectionOptions()['schema'] ?? 'public';
+    $this->assertEquals($schema . '.' . $this->connection->getPrefix() . 'sequence_test_uid_seq', $sequence_name);
+
+    // Checks if the sequence exists.
+    $this->assertTrue((bool) \Drupal::database()
+      ->query("SELECT c.relname FROM pg_class as c WHERE c.relkind = 'S' AND c.relname = :name", [
+        ':name' => $this->connection->getPrefix() . 'sequence_test_uid_seq',
+      ])
+      ->fetchField());
+
+    // Retrieves the sequence owner object.
+    $sequence_owner = \Drupal::database()->query("SELECT d.refobjid::regclass as table_name, a.attname as field_name
+      FROM pg_depend d
+      JOIN pg_attribute a ON a.attrelid = d.refobjid AND a.attnum = d.refobjsubid
+      WHERE d.objid = :seq_name::regclass
+      AND d.refobjsubid > 0
+      AND d.classid = 'pg_class'::regclass", [':seq_name' => $sequence_name])->fetchObject();
+
+    $this->assertEquals($this->connection->getPrefix() . 'sequence_test', $sequence_owner->table_name);
+    $this->assertEquals('uid', $sequence_owner->field_name, 'New sequence is owned by its table.');
+
+  }
+
+  /**
+   * Tests the method tableExists().
+   */
+  public function testTableExists(): void {
+    $table_name = 'test_table';
+    $table_specification = [
+      'fields' => [
+        'id'  => [
+          'type' => 'int',
+          'default' => NULL,
+        ],
+      ],
+    ];
+    $this->schema->createTable($table_name, $table_specification);
+    $prefixed_table_name = $this->connection->getPrefix($table_name) . $table_name;
+
+    // Three different calls to the method Schema::tableExists() with an
+    // unprefixed table name.
+    $this->assertTrue($this->schema->tableExists($table_name));
+    $this->assertTrue($this->schema->tableExists($table_name, TRUE));
+    $this->assertFalse($this->schema->tableExists($table_name, FALSE));
+
+    // Three different calls to the method Schema::tableExists() with a
+    // prefixed table name.
+    $this->assertFalse($this->schema->tableExists($prefixed_table_name));
+    $this->assertFalse($this->schema->tableExists($prefixed_table_name, TRUE));
+    $this->assertTrue($this->schema->tableExists($prefixed_table_name, FALSE));
+  }
+
+  /**
+   * Tests renaming a table where the new index name is equal to the table name.
+   */
+  public function testRenameTableWithNewIndexNameEqualsTableName(): void {
+    // Special table names for colliding with the PostgreSQL new index name.
+    $table_name_old = 'some_new_table_name__id__idx';
+    $table_name_new = 'some_new_table_name';
+    $table_specification = [
+      'fields' => [
+        'id'  => [
+          'type' => 'int',
+          'default' => NULL,
+        ],
+      ],
+      'indexes' => [
+        'id' => ['id'],
+      ],
+    ];
+    $this->schema->createTable($table_name_old, $table_specification);
+
+    // Renaming the table can fail for PostgreSQL, when a new index name is
+    // equal to the old table name.
+    $this->schema->renameTable($table_name_old, $table_name_new);
+
+    $this->assertTrue($this->schema->tableExists($table_name_new));
+  }
+
+  /**
+   * Tests column name escaping in field constraints.
+   */
+  public function testUnsignedField(): void {
+    $table_name = 'unsigned_table';
+    $table_spec = [
+      'fields' => [
+        'order' => [
+          'type' => 'int',
+          'unsigned' => TRUE,
+          'not null' => TRUE,
+        ],
+      ],
+      'primary key' => ['order'],
+    ];
+    $this->schema->createTable($table_name, $table_spec);
+  }
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/SchemaUniquePrefixedKeysIndexTest.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\SchemaUniquePrefixedKeysIndexTestBase;
+
+/**
+ * Tests adding UNIQUE keys to tables.
+ *
+ * @group Database
+ */
+class SchemaUniquePrefixedKeysIndexTest extends SchemaUniquePrefixedKeysIndexTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected string $columnValue = '1234567890 foo';
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/SyntaxTest.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\DriverSpecificSyntaxTestBase;
+
+/**
+ * Tests PostgreSQL syntax interpretation.
+ *
+ * @group Database
+ */
+class SyntaxTest extends DriverSpecificSyntaxTestBase {
+}

core/modules/pgsql/tests/src/Kernel/pgsql/TemporaryQueryTest.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\TemporaryQueryTestBase;
+
+/**
+ * Tests the temporary query functionality.
+ *
+ * @group Database
+ */
+class TemporaryQueryTest extends TemporaryQueryTestBase {
+
+  /**
+   * Confirms that temporary tables work.
+   */
+  public function testTemporaryQuery(): void {
+    parent::testTemporaryQuery();
+
+    $connection = $this->getConnection();
+
+    $table_name_test = $connection->queryTemporary('SELECT [name] FROM {test}', []);
+
+    // Assert that the table is indeed a temporary one.
+    $temporary_table_info = $connection->query("SELECT * FROM pg_class WHERE relname LIKE '%$table_name_test%'")->fetch();
+    $this->assertEquals("t", $temporary_table_info->relpersistence);
+
+    // Assert that both have the same field names.
+    $normal_table_fields = $connection->query("SELECT * FROM {test}")->fetch();
+    $temp_table_name = $connection->queryTemporary('SELECT * FROM {test}');
+    $temp_table_fields = $connection->query("SELECT * FROM {" . $temp_table_name . "}")->fetch();
+
+    $normal_table_fields = array_keys(get_object_vars($normal_table_fields));
+    $temp_table_fields = array_keys(get_object_vars($temp_table_fields));
+
+    $this->assertEmpty(array_diff($normal_table_fields, $temp_table_fields));
+  }
+
+}

core/modules/pgsql/tests/src/Kernel/pgsql/TransactionTest.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Kernel\pgsql;
+
+use Drupal\KernelTests\Core\Database\DriverSpecificTransactionTestBase;
+
+/**
+ * Tests transaction for the PostgreSQL driver.
+ *
+ * @group Database
+ */
+class TransactionTest extends DriverSpecificTransactionTestBase {
+}

core/modules/pgsql/tests/src/Unit/SchemaTest.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\pgsql\Unit;
+
+use Drupal\pgsql\Driver\Database\pgsql\Schema;
+use Drupal\Tests\UnitTestCase;
+use Prophecy\Argument;
+
+/**
+ * @coversDefaultClass \Drupal\pgsql\Driver\Database\pgsql\Schema
+ * @group Database
+ */
+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'],
+    ];
+  }
+
+}