From aa1b65b5d42f6f163870377622c7384d8b0bc01b Mon Sep 17 00:00:00 2001
From: "J. King" <jking@jkingweb.ca>
Date: Thu, 22 Nov 2018 13:55:57 -0500
Subject: [PATCH] Take a different tack on shared database tests

Tests for different drivers will have their own files, but all derive
from a common prototype test series where applicable, similar to the
existing arrangement for database function tests. However, the prototype
will reside with other test cases rather than in the library path. The
database function test series will hopefully be moved as well in time.
---
 composer.json                            |   3 +-
 tests/cases/Db/BaseDriver.php            | 357 ++++++++++++++++++++
 tests/cases/Db/SQLite3/TestDriver.php    | 406 +++++------------------
 tests/cases/Db/SQLite3PDO/TestDriver.php | 346 ++-----------------
 tests/lib/AbstractTest.php               | 109 +++++-
 tests/phpunit.xml                        |   1 +
 6 files changed, 571 insertions(+), 651 deletions(-)
 create mode 100644 tests/cases/Db/BaseDriver.php

diff --git a/composer.json b/composer.json
index aa4ac4a8..5f943d94 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,8 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "JKingWeb\\Arsse\\Test\\": "tests/lib/"
+            "JKingWeb\\Arsse\\Test\\": "tests/lib/",
+            "JKingWeb\\Arsse\\TestCase\\": "tests/cases/"
         }
     }
 }
diff --git a/tests/cases/Db/BaseDriver.php b/tests/cases/Db/BaseDriver.php
new file mode 100644
index 00000000..4b6d68ab
--- /dev/null
+++ b/tests/cases/Db/BaseDriver.php
@@ -0,0 +1,357 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\TestCase\Db;
+
+use JKingWeb\Arsse\Db\Statement;
+use JKingWeb\Arsse\Db\Result;
+
+
+abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
+    protected $drv;
+    protected $interface;
+    protected $create;
+    protected $lock;
+    protected $setVersion;
+    protected $conf = [
+        'dbTimeoutExec' => 0.5,
+        'dbSQLite3Timeout' => 0,
+    ];
+    
+    public function setUp() {
+        $this->setConf($this->conf);
+        $this->interface = $this->getDbInterface($this->implementation);
+        if (!$this->interface) {
+            $this->markTestSkipped("$this->implementation database driver not available");
+        }
+        $this->drv = $this->getDbDriver($this->implementation);
+        $this->exec("DROP TABLE IF EXISTS arsse_test");
+        $this->exec("DROP TABLE IF EXISTS arsse_meta");
+        $this->exec("CREATE TABLE arsse_meta(key varchar(255) primary key not null, value text)");
+        $this->exec("INSERT INTO arsse_meta(key,value) values('schema_version','0')");
+    }
+
+    public function tearDown() {
+        unset($this->drv);
+        try {
+            $this->exec("ROLLBACK");
+        } catch(\Throwable $e) {
+        }
+        $this->exec("DROP TABLE IF EXISTS arsse_meta");
+        $this->exec("DROP TABLE IF EXISTS arsse_test");
+    }
+
+    protected function exec(string $q): bool {
+        // PDO implementation
+        $this->interface->exec($q);
+        return true;
+    }
+
+    protected function query(string $q) {
+        // PDO implementation
+        return $this->interface->query($q)->fetchColumn();
+    }
+
+    # TESTS 
+    
+    public function testFetchDriverName() {
+        $class = get_class($this->drv);
+        $this->assertTrue(strlen($class::driverName()) > 0);
+    }
+
+    public function testCheckCharacterSetAcceptability() {
+        $this->assertTrue($this->drv->charsetAcceptable());
+    }
+
+    public function testExecAValidStatement() {
+        $this->assertTrue($this->drv->exec($this->create));
+    }
+
+    public function testExecAnInvalidStatement() {
+        $this->assertException("engineErrorGeneral", "Db");
+        $this->drv->exec("And the meek shall inherit the earth...");
+    }
+
+    public function testExecMultipleStatements() {
+        $this->assertTrue($this->drv->exec("$this->create; INSERT INTO arsse_test(id) values(2112)"));
+        $this->assertEquals(2112, $this->query("SELECT id from arsse_test"));
+    }
+
+    public function testExecTimeout() {
+        $this->exec($this->create);
+        $this->exec($this->lock);
+        $this->assertException("general", "Db", "ExceptionTimeout");
+        $this->drv->exec($this->lock);
+    }
+
+    public function testExecConstraintViolation() {
+        $this->drv->exec("CREATE TABLE arsse_test(id varchar(255) not null)");
+        $this->assertException("constraintViolation", "Db", "ExceptionInput");
+        $this->drv->exec("INSERT INTO arsse_test default values");
+    }
+
+    public function testExecTypeViolation() {
+        $this->drv->exec($this->create);
+        $this->assertException("typeViolation", "Db", "ExceptionInput");
+        $this->drv->exec("INSERT INTO arsse_test(id) values('ook')");
+    }
+
+    public function testMakeAValidQuery() {
+        $this->assertInstanceOf(Result::class, $this->drv->query("SELECT 1"));
+    }
+
+    public function testMakeAnInvalidQuery() {
+        $this->assertException("engineErrorGeneral", "Db");
+        $this->drv->query("Apollo was astonished; Dionysus thought me mad");
+    }
+
+    public function testQueryTimeout() {
+        $this->exec($this->create);
+        $this->exec($this->lock);
+        $this->assertException("general", "Db", "ExceptionTimeout");
+        $this->drv->exec($this->lock);
+    }
+
+    public function testQueryConstraintViolation() {
+        $this->drv->exec("CREATE TABLE arsse_test(id integer not null)");
+        $this->assertException("constraintViolation", "Db", "ExceptionInput");
+        $this->drv->query("INSERT INTO arsse_test default values");
+    }
+
+    public function testQueryTypeViolation() {
+        $this->drv->exec($this->create);
+        $this->assertException("typeViolation", "Db", "ExceptionInput");
+        $this->drv->query("INSERT INTO arsse_test(id) values('ook')");
+    }
+
+    public function testPrepareAValidQuery() {
+        $s = $this->drv->prepare("SELECT ?, ?", "int", "int");
+        $this->assertInstanceOf(Statement::class, $s);
+    }
+
+    public function testPrepareAnInvalidQuery() {
+        $this->assertException("engineErrorGeneral", "Db");
+        $s = $this->drv->prepare("This is an invalid query", "int", "int")->run();
+    }
+
+    public function testCreateASavepoint() {
+        $this->assertEquals(1, $this->drv->savepointCreate());
+        $this->assertEquals(2, $this->drv->savepointCreate());
+        $this->assertEquals(3, $this->drv->savepointCreate());
+    }
+
+    public function testReleaseASavepoint() {
+        $this->assertEquals(1, $this->drv->savepointCreate());
+        $this->assertEquals(true, $this->drv->savepointRelease());
+        $this->assertException("savepointInvalid", "Db");
+        $this->drv->savepointRelease();
+    }
+
+    public function testUndoASavepoint() {
+        $this->assertEquals(1, $this->drv->savepointCreate());
+        $this->assertEquals(true, $this->drv->savepointUndo());
+        $this->assertException("savepointInvalid", "Db");
+        $this->drv->savepointUndo();
+    }
+
+    public function testManipulateSavepoints() {
+        $this->assertEquals(1, $this->drv->savepointCreate());
+        $this->assertEquals(2, $this->drv->savepointCreate());
+        $this->assertEquals(3, $this->drv->savepointCreate());
+        $this->assertEquals(4, $this->drv->savepointCreate());
+        $this->assertEquals(5, $this->drv->savepointCreate());
+        $this->assertTrue($this->drv->savepointUndo(3));
+        $this->assertFalse($this->drv->savepointRelease(4));
+        $this->assertEquals(6, $this->drv->savepointCreate());
+        $this->assertFalse($this->drv->savepointRelease(5));
+        $this->assertTrue($this->drv->savepointRelease(6));
+        $this->assertEquals(3, $this->drv->savepointCreate());
+        $this->assertTrue($this->drv->savepointRelease(2));
+        $this->assertException("savepointStale", "Db");
+        $this->drv->savepointRelease(2);
+    }
+
+    public function testManipulateSavepointsSomeMore() {
+        $this->assertEquals(1, $this->drv->savepointCreate());
+        $this->assertEquals(2, $this->drv->savepointCreate());
+        $this->assertEquals(3, $this->drv->savepointCreate());
+        $this->assertEquals(4, $this->drv->savepointCreate());
+        $this->assertTrue($this->drv->savepointRelease(2));
+        $this->assertFalse($this->drv->savepointUndo(3));
+        $this->assertException("savepointStale", "Db");
+        $this->drv->savepointUndo(2);
+    }
+
+    public function testBeginATransaction() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $this->drv->query($insert);
+        $this->assertEquals(2, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+    }
+
+    public function testCommitATransaction() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr->commit();
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(1, $this->query($select));
+    }
+
+    public function testRollbackATransaction() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr->rollback();
+        $this->assertEquals(0, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+    }
+
+    public function testBeginChainedTransactions() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr1 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(2, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+    }
+
+    public function testCommitChainedTransactions() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr1 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(2, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2->commit();
+        $this->assertEquals(0, $this->query($select));
+        $tr1->commit();
+        $this->assertEquals(2, $this->query($select));
+    }
+
+    public function testCommitChainedTransactionsOutOfOrder() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr1 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(2, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr1->commit();
+        $this->assertEquals(2, $this->query($select));
+        $tr2->commit();
+    }
+
+    public function testRollbackChainedTransactions() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr1 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(2, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2->rollback();
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr1->rollback();
+        $this->assertEquals(0, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+    }
+
+    public function testRollbackChainedTransactionsOutOfOrder() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr1 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(2, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr1->rollback();
+        $this->assertEquals(0, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2->rollback();
+        $this->assertEquals(0, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+    }
+
+    public function testPartiallyRollbackChainedTransactions() {
+        $select = "SELECT count(*) FROM arsse_test";
+        $insert = "INSERT INTO arsse_test default values";
+        $this->drv->exec($this->create);
+        $tr1 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2 = $this->drv->begin();
+        $this->drv->query($insert);
+        $this->assertEquals(2, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr2->rollback();
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(0, $this->query($select));
+        $tr1->commit();
+        $this->assertEquals(1, $this->drv->query($select)->getValue());
+        $this->assertEquals(1, $this->query($select));
+    }
+
+    public function testFetchSchemaVersion() {
+        $this->assertSame(0, $this->drv->schemaVersion());
+        $this->drv->exec(str_replace("#", "1", $this->setVersion));
+        $this->assertSame(1, $this->drv->schemaVersion());
+        $this->drv->exec(str_replace("#", "2", $this->setVersion));
+        $this->assertSame(2, $this->drv->schemaVersion());
+    }
+
+    public function testLockTheDatabase() {
+        $this->drv->savepointCreate(true);
+        $this->assertException();
+        $this->exec($this->create);
+    }
+
+    public function testUnlockTheDatabase() {
+        $this->drv->savepointCreate(true);
+        $this->drv->savepointRelease();
+        $this->drv->savepointCreate(true);
+        $this->drv->savepointUndo();
+        $this->assertTrue($this->exec($this->create));
+    }
+}
diff --git a/tests/cases/Db/SQLite3/TestDriver.php b/tests/cases/Db/SQLite3/TestDriver.php
index 835ad095..3316a01a 100644
--- a/tests/cases/Db/SQLite3/TestDriver.php
+++ b/tests/cases/Db/SQLite3/TestDriver.php
@@ -6,338 +6,96 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse\TestCase\Db\SQLite3;
 
-use JKingWeb\Arsse\Arsse;
-use JKingWeb\Arsse\Conf;
-use JKingWeb\Arsse\Database;
-use JKingWeb\Arsse\Db\SQLite3\Driver;
-use JKingWeb\Arsse\Db\Result;
-use JKingWeb\Arsse\Db\Statement;
-
 /**
  * @covers \JKingWeb\Arsse\Db\SQLite3\Driver<extended>
  * @covers \JKingWeb\Arsse\Db\SQLite3\ExceptionBuilder */
-class TestDriver extends \JKingWeb\Arsse\Test\AbstractTest {
-    protected $data;
-    protected $drv;
-    protected $ch;
+class TestDriver extends \JKingWeb\Arsse\TestCase\Db\BaseDriver {
+    protected $implementation = "SQLite 3";
+    protected $create = "CREATE TABLE arsse_test(id integer primary key)";
+    protected $lock = "BEGIN EXCLUSIVE TRANSACTION";
+    protected $setVersion = "PRAGMA user_version=#";
+    protected static $file;
 
+    public static function setUpBeforeClass() {
+        self::$file = tempnam(sys_get_temp_dir(), 'ook');
+    }
+
+    public static function tearDownAfterClass() {
+        @unlink(self::$file);
+        self::$file = null;
+    }
+    
     public function setUp() {
-        if (!Driver::requirementsMet()) {
-            $this->markTestSkipped("SQLite extension not loaded");
-        }
-        $this->clearData();
-        $this->setConf([
-            'dbDriver' => Driver::class,
-            'dbSQLite3Timeout' => 0,
-            'dbSQLite3File' => tempnam(sys_get_temp_dir(), 'ook'),
-        ]);
-        $this->drv = new Driver();
-        $this->ch = new \SQLite3(Arsse::$conf->dbSQLite3File);
-        $this->ch->enableExceptions(true);
+        $this->conf['dbSQLite3File'] = self::$file;
+        parent::setUp();
+        $this->exec("PRAGMA user_version=0");
     }
 
     public function tearDown() {
-        unset($this->drv);
-        unset($this->ch);
-        if (isset(Arsse::$conf)) {
-            unlink(Arsse::$conf->dbSQLite3File);
-        }
+        parent::tearDown();
+        $this->exec("PRAGMA user_version=0");
+        $this->interface->close();
+        unset($this->interface);
+    }
+
+    protected function exec(string $q): bool {
+        $this->interface->exec($q);
+        return true;
+    }
+
+    protected function query(string $q) {
+        return $this->interface->querySingle($q);
+    }
+
+    public function provideDrivers() {
         $this->clearData();
-    }
-
-    public function testFetchDriverName() {
-        $class = Arsse::$conf->dbDriver;
-        $this->assertTrue(strlen($class::driverName()) > 0);
-    }
-
-    public function testCheckCharacterSetAcceptability() {
-        $this->assertTrue($this->drv->charsetAcceptable());
-    }
-
-    public function testExecAValidStatement() {
-        $this->assertTrue($this->drv->exec("CREATE TABLE test(id integer primary key)"));
-    }
-
-    public function testExecAnInvalidStatement() {
-        $this->assertException("engineErrorGeneral", "Db");
-        $this->drv->exec("And the meek shall inherit the earth...");
-    }
-
-    public function testExecMultipleStatements() {
-        $this->assertTrue($this->drv->exec("CREATE TABLE test(id integer primary key); INSERT INTO test(id) values(2112)"));
-        $this->assertEquals(2112, $this->ch->querySingle("SELECT id from test"));
-    }
-
-    public function testExecTimeout() {
-        $this->ch->exec("BEGIN EXCLUSIVE TRANSACTION");
-        $this->assertException("general", "Db", "ExceptionTimeout");
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-    }
-
-    public function testExecConstraintViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer not null)");
-        $this->assertException("constraintViolation", "Db", "ExceptionInput");
-        $this->drv->exec("INSERT INTO test(id) values(null)");
-    }
-
-    public function testExecTypeViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $this->assertException("typeViolation", "Db", "ExceptionInput");
-        $this->drv->exec("INSERT INTO test(id) values('ook')");
-    }
-
-    public function testMakeAValidQuery() {
-        $this->assertInstanceOf(Result::class, $this->drv->query("SELECT 1"));
-    }
-
-    public function testMakeAnInvalidQuery() {
-        $this->assertException("engineErrorGeneral", "Db");
-        $this->drv->query("Apollo was astonished; Dionysus thought me mad");
-    }
-
-    public function testQueryTimeout() {
-        $this->ch->exec("BEGIN EXCLUSIVE TRANSACTION");
-        $this->assertException("general", "Db", "ExceptionTimeout");
-        $this->drv->query("CREATE TABLE test(id integer primary key)");
-    }
-
-    public function testQueryConstraintViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer not null)");
-        $this->assertException("constraintViolation", "Db", "ExceptionInput");
-        $this->drv->query("INSERT INTO test(id) values(null)");
-    }
-
-    public function testQueryTypeViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $this->assertException("typeViolation", "Db", "ExceptionInput");
-        $this->drv->query("INSERT INTO test(id) values('ook')");
-    }
-
-    public function testPrepareAValidQuery() {
-        $s = $this->drv->prepare("SELECT ?, ?", "int", "int");
-        $this->assertInstanceOf(Statement::class, $s);
-    }
-
-    public function testPrepareAnInvalidQuery() {
-        $this->assertException("engineErrorGeneral", "Db");
-        $s = $this->drv->prepare("This is an invalid query", "int", "int");
-    }
-
-    public function testCreateASavepoint() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(2, $this->drv->savepointCreate());
-        $this->assertEquals(3, $this->drv->savepointCreate());
-    }
-
-    public function testReleaseASavepoint() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(true, $this->drv->savepointRelease());
-        $this->assertException("savepointInvalid", "Db");
-        $this->drv->savepointRelease();
-    }
-
-    public function testUndoASavepoint() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(true, $this->drv->savepointUndo());
-        $this->assertException("savepointInvalid", "Db");
-        $this->drv->savepointUndo();
-    }
-
-    public function testManipulateSavepoints() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(2, $this->drv->savepointCreate());
-        $this->assertEquals(3, $this->drv->savepointCreate());
-        $this->assertEquals(4, $this->drv->savepointCreate());
-        $this->assertEquals(5, $this->drv->savepointCreate());
-        $this->assertTrue($this->drv->savepointUndo(3));
-        $this->assertFalse($this->drv->savepointRelease(4));
-        $this->assertEquals(6, $this->drv->savepointCreate());
-        $this->assertFalse($this->drv->savepointRelease(5));
-        $this->assertTrue($this->drv->savepointRelease(6));
-        $this->assertEquals(3, $this->drv->savepointCreate());
-        $this->assertTrue($this->drv->savepointRelease(2));
-        $this->assertException("savepointStale", "Db");
-        $this->drv->savepointRelease(2);
-    }
-
-    public function testManipulateSavepointsSomeMore() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(2, $this->drv->savepointCreate());
-        $this->assertEquals(3, $this->drv->savepointCreate());
-        $this->assertEquals(4, $this->drv->savepointCreate());
-        $this->assertTrue($this->drv->savepointRelease(2));
-        $this->assertFalse($this->drv->savepointUndo(3));
-        $this->assertException("savepointStale", "Db");
-        $this->drv->savepointUndo(2);
-    }
-
-    public function testBeginATransaction() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-    }
-
-    public function testCommitATransaction() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr->commit();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(1, $this->ch->querySingle($select));
-    }
-
-    public function testRollbackATransaction() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-    }
-
-    public function testBeginChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-    }
-
-    public function testCommitChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2->commit();
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr1->commit();
-        $this->assertEquals(2, $this->ch->querySingle($select));
-    }
-
-    public function testCommitChainedTransactionsOutOfOrder() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr1->commit();
-        $this->assertEquals(2, $this->ch->querySingle($select));
-        $tr2->commit();
-    }
-
-    public function testRollbackChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2->rollback();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr1->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-    }
-
-    public function testRollbackChainedTransactionsOutOfOrder() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr1->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-    }
-
-    public function testPartiallyRollbackChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr2->rollback();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->querySingle($select));
-        $tr1->commit();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(1, $this->ch->querySingle($select));
-    }
-
-    public function testFetchSchemaVersion() {
-        $this->assertSame(0, $this->drv->schemaVersion());
-        $this->drv->exec("PRAGMA user_version=1");
-        $this->assertSame(1, $this->drv->schemaVersion());
-        $this->drv->exec("PRAGMA user_version=2");
-        $this->assertSame(2, $this->drv->schemaVersion());
-    }
-
-    public function testLockTheDatabase() {
-        $this->drv->savepointCreate(true);
-        $this->assertException();
-        $this->ch->exec("CREATE TABLE test(id integer primary key)");
-    }
-
-    public function testUnlockTheDatabase() {
-        $this->drv->savepointCreate(true);
-        $this->drv->savepointRelease();
-        $this->drv->savepointCreate(true);
-        $this->drv->savepointUndo();
-        $this->assertSame(true, $this->ch->exec("CREATE TABLE test(id integer primary key)"));
+        $this->setConf([
+            'dbTimeoutExec' => 0.5,
+            'dbSQLite3Timeout' => 0,
+            'dbSQLite3File' => tempnam(sys_get_temp_dir(), 'ook'),
+        ]);
+        $i = $this->provideDbInterfaces();
+        $d = $this->provideDbDrivers();
+        $pdoExec = function (string $q) {
+            $this->interface->exec($q);
+            return true;
+        };
+        $pdoQuery = function (string $q) {
+            return $this->interface->query($q)->fetchColumn();
+        };
+        return [
+            'SQLite 3' => [
+                $i['SQLite 3']['interface'], 
+                $d['SQLite 3'], 
+                "CREATE TABLE arsse_test(id integer primary key)", 
+                "BEGIN EXCLUSIVE TRANSACTION",
+                "PRAGMA user_version=#",
+                function (string $q) {
+                    $this->interface->exec($q);
+                    return true;
+                },
+                function (string $q) {
+                    return $this->interface->querySingle($q);
+                },
+            ],
+            'PDO SQLite 3' => [
+                $i['PDO SQLite 3']['interface'], 
+                $d['PDO SQLite 3'], 
+                "CREATE TABLE arsse_test(id integer primary key)", 
+                "BEGIN EXCLUSIVE TRANSACTION",
+                "PRAGMA user_version=#",
+                $pdoExec,
+                $pdoQuery,
+            ],
+            'PDO PostgreSQL' => [
+                $i['PDO PostgreSQL']['interface'], 
+                $d['PDO PostgreSQL'], 
+                "CREATE TABLE arsse_test(id bigserial primary key)", 
+                "BEGIN; LOCK TABLE arsse_test IN EXCLUSIVE MODE NOWAIT",
+                "UPDATE arsse_meta set value = '#' where key = 'schema_version'",
+                $pdoExec,
+                $pdoQuery,
+            ],
+        ];
     }
 }
diff --git a/tests/cases/Db/SQLite3PDO/TestDriver.php b/tests/cases/Db/SQLite3PDO/TestDriver.php
index 6d58f51b..73ae773e 100644
--- a/tests/cases/Db/SQLite3PDO/TestDriver.php
+++ b/tests/cases/Db/SQLite3PDO/TestDriver.php
@@ -6,339 +6,35 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse\TestCase\Db\SQLite3PDO;
 
-use JKingWeb\Arsse\Arsse;
-use JKingWeb\Arsse\Conf;
-use JKingWeb\Arsse\Database;
-use JKingWeb\Arsse\Db\SQLite3\PDODriver;
-use JKingWeb\Arsse\Db\Result;
-use JKingWeb\Arsse\Db\Statement;
-
 /**
  * @covers \JKingWeb\Arsse\Db\SQLite3\PDODriver<extended>
  * @covers \JKingWeb\Arsse\Db\PDODriver
  * @covers \JKingWeb\Arsse\Db\PDOError */
-class TestDriver extends \JKingWeb\Arsse\Test\AbstractTest {
-    protected $data;
-    protected $drv;
-    protected $ch;
+class TestDriver extends \JKingWeb\Arsse\TestCase\Db\BaseDriver {
+    protected $implementation = "PDO SQLite 3";
+    protected $create = "CREATE TABLE arsse_test(id integer primary key)";
+    protected $lock = "BEGIN EXCLUSIVE TRANSACTION";
+    protected $setVersion = "PRAGMA user_version=#";
+    protected static $file;
 
+    public static function setUpBeforeClass() {
+        self::$file = tempnam(sys_get_temp_dir(), 'ook');
+    }
+
+    public static function tearDownAfterClass() {
+        @unlink(self::$file);
+        self::$file = null;
+    }
+    
     public function setUp() {
-        if (!PDODriver::requirementsMet()) {
-            $this->markTestSkipped("PDO-SQLite extension not loaded");
-        }
-        $this->clearData();
-        $this->setConf([
-            'dbDriver' => PDODriver::class,
-            'dbSQLite3Timeout' => 0,
-            'dbSQLite3File' => tempnam(sys_get_temp_dir(), 'ook'),
-        ]);
-        $this->drv = new PDODriver();
-        $this->ch = new \PDO("sqlite:".Arsse::$conf->dbSQLite3File, "", "", [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION]);
+        $this->conf['dbSQLite3File'] = self::$file;
+        parent::setUp();
+        $this->exec("PRAGMA user_version=0");
     }
 
     public function tearDown() {
-        unset($this->drv);
-        unset($this->ch);
-        if (isset(Arsse::$conf)) {
-            unlink(Arsse::$conf->dbSQLite3File);
-        }
-        $this->clearData();
-    }
-
-    public function testFetchDriverName() {
-        $class = Arsse::$conf->dbDriver;
-        $this->assertTrue(strlen($class::driverName()) > 0);
-    }
-
-    public function testCheckCharacterSetAcceptability() {
-        $this->assertTrue($this->drv->charsetAcceptable());
-    }
-
-    public function testExecAValidStatement() {
-        $this->assertTrue($this->drv->exec("CREATE TABLE test(id integer primary key)"));
-    }
-
-    public function testExecAnInvalidStatement() {
-        $this->assertException("engineErrorGeneral", "Db");
-        $this->drv->exec("And the meek shall inherit the earth...");
-    }
-
-    public function testExecMultipleStatements() {
-        $this->assertTrue($this->drv->exec("CREATE TABLE test(id integer primary key); INSERT INTO test(id) values(2112)"));
-        $this->assertEquals(2112, $this->ch->query("SELECT id from test")->fetchColumn());
-    }
-
-    public function testExecTimeout() {
-        $this->ch->exec("BEGIN EXCLUSIVE TRANSACTION");
-        $this->assertException("general", "Db", "ExceptionTimeout");
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-    }
-
-    public function testExecConstraintViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer not null)");
-        $this->assertException("constraintViolation", "Db", "ExceptionInput");
-        $this->drv->exec("INSERT INTO test(id) values(null)");
-    }
-
-    public function testExecTypeViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $this->assertException("typeViolation", "Db", "ExceptionInput");
-        $this->drv->exec("INSERT INTO test(id) values('ook')");
-    }
-
-    public function testMakeAValidQuery() {
-        $this->assertInstanceOf(Result::class, $this->drv->query("SELECT 1"));
-    }
-
-    public function testMakeAnInvalidQuery() {
-        $this->assertException("engineErrorGeneral", "Db");
-        $this->drv->query("Apollo was astonished; Dionysus thought me mad");
-    }
-
-    public function testQueryTimeout() {
-        $this->ch->exec("BEGIN EXCLUSIVE TRANSACTION");
-        $this->assertException("general", "Db", "ExceptionTimeout");
-        $this->drv->query("CREATE TABLE test(id integer primary key)");
-    }
-
-    public function testQueryConstraintViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer not null)");
-        $this->assertException("constraintViolation", "Db", "ExceptionInput");
-        $this->drv->query("INSERT INTO test(id) values(null)");
-    }
-
-    public function testQueryTypeViolation() {
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $this->assertException("typeViolation", "Db", "ExceptionInput");
-        $this->drv->query("INSERT INTO test(id) values('ook')");
-    }
-
-    public function testPrepareAValidQuery() {
-        $s = $this->drv->prepare("SELECT ?, ?", "int", "int");
-        $this->assertInstanceOf(Statement::class, $s);
-    }
-
-    public function testPrepareAnInvalidQuery() {
-        $this->assertException("engineErrorGeneral", "Db");
-        $s = $this->drv->prepare("This is an invalid query", "int", "int");
-    }
-
-    public function testCreateASavepoint() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(2, $this->drv->savepointCreate());
-        $this->assertEquals(3, $this->drv->savepointCreate());
-    }
-
-    public function testReleaseASavepoint() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(true, $this->drv->savepointRelease());
-        $this->assertException("savepointInvalid", "Db");
-        $this->drv->savepointRelease();
-    }
-
-    public function testUndoASavepoint() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(true, $this->drv->savepointUndo());
-        $this->assertException("savepointInvalid", "Db");
-        $this->drv->savepointUndo();
-    }
-
-    public function testManipulateSavepoints() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(2, $this->drv->savepointCreate());
-        $this->assertEquals(3, $this->drv->savepointCreate());
-        $this->assertEquals(4, $this->drv->savepointCreate());
-        $this->assertEquals(5, $this->drv->savepointCreate());
-        $this->assertTrue($this->drv->savepointUndo(3));
-        $this->assertFalse($this->drv->savepointRelease(4));
-        $this->assertEquals(6, $this->drv->savepointCreate());
-        $this->assertFalse($this->drv->savepointRelease(5));
-        $this->assertTrue($this->drv->savepointRelease(6));
-        $this->assertEquals(3, $this->drv->savepointCreate());
-        $this->assertTrue($this->drv->savepointRelease(2));
-        $this->assertException("savepointStale", "Db");
-        $this->drv->savepointRelease(2);
-    }
-
-    public function testManipulateSavepointsSomeMore() {
-        $this->assertEquals(1, $this->drv->savepointCreate());
-        $this->assertEquals(2, $this->drv->savepointCreate());
-        $this->assertEquals(3, $this->drv->savepointCreate());
-        $this->assertEquals(4, $this->drv->savepointCreate());
-        $this->assertTrue($this->drv->savepointRelease(2));
-        $this->assertFalse($this->drv->savepointUndo(3));
-        $this->assertException("savepointStale", "Db");
-        $this->drv->savepointUndo(2);
-    }
-
-    public function testBeginATransaction() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testCommitATransaction() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr->commit();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(1, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testRollbackATransaction() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testBeginChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testCommitChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2->commit();
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr1->commit();
-        $this->assertEquals(2, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testCommitChainedTransactionsOutOfOrder() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr1->commit();
-        $this->assertEquals(2, $this->ch->query($select)->fetchColumn());
-        $tr2->commit();
-    }
-
-    public function testRollbackChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2->rollback();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr1->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testRollbackChainedTransactionsOutOfOrder() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr1->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2->rollback();
-        $this->assertEquals(0, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testPartiallyRollbackChainedTransactions() {
-        $select = "SELECT count(*) FROM test";
-        $insert = "INSERT INTO test(id) values(null)";
-        $this->drv->exec("CREATE TABLE test(id integer primary key)");
-        $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
-        $this->assertEquals(2, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr2->rollback();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(0, $this->ch->query($select)->fetchColumn());
-        $tr1->commit();
-        $this->assertEquals(1, $this->drv->query($select)->getValue());
-        $this->assertEquals(1, $this->ch->query($select)->fetchColumn());
-    }
-
-    public function testFetchSchemaVersion() {
-        $this->assertSame(0, $this->drv->schemaVersion());
-        $this->drv->exec("PRAGMA user_version=1");
-        $this->assertSame(1, $this->drv->schemaVersion());
-        $this->drv->exec("PRAGMA user_version=2");
-        $this->assertSame(2, $this->drv->schemaVersion());
-    }
-
-    public function testLockTheDatabase() {
-        $this->drv->savepointCreate(true);
-        $this->ch->exec("PRAGMA busy_timeout = 0");
-        $this->assertException();
-        $this->ch->exec("CREATE TABLE test(id integer primary key)");
-    }
-
-    public function testUnlockTheDatabase() {
-        $this->drv->savepointCreate(true);
-        $this->drv->savepointRelease();
-        $this->drv->savepointCreate(true);
-        $this->drv->savepointUndo();
-        $this->assertSame(0, $this->ch->exec("CREATE TABLE test(id integer primary key)"));
+        parent::tearDown();
+        $this->exec("PRAGMA user_version=0");
+        unset($this->interface);
     }
 }
diff --git a/tests/lib/AbstractTest.php b/tests/lib/AbstractTest.php
index 750c6b0c..e4930f04 100644
--- a/tests/lib/AbstractTest.php
+++ b/tests/lib/AbstractTest.php
@@ -43,11 +43,12 @@ abstract class AbstractTest extends \PHPUnit\Framework\TestCase {
     public function setConf(array $conf = []) {
         $defaults = [
             'dbSQLite3File' => ":memory:",
+            'dbSQLite3Timeout' => 0,
             'dbPostgreSQLUser' => "arsse_test",
             'dbPostgreSQLPass' => "arsse_test",
             'dbPostgreSQLDb' => "arsse_test",
         ];
-        Arsse::$conf = (new Conf)->import($defaults)->import($conf);
+        Arsse::$conf = Arsse::$conf ?? (new Conf)->import($defaults)->import($conf);
     }
 
     public function assertException(string $msg = "", string $prefix = "", string $type = "Exception") {
@@ -126,6 +127,33 @@ abstract class AbstractTest extends \PHPUnit\Framework\TestCase {
         return $value;
     }
 
+    public function provideDbDrivers(array $conf = []): array {
+        $this->setConf($conf);
+        return [
+            'SQLite 3' => (function() {
+                try {
+                    return new \JKingWeb\Arsse\Db\SQLite3\Driver;
+                } catch (\Exception $e) {
+                    return;
+                }
+            })(),
+            'PDO SQLite 3' => (function() {
+                try {
+                    return new \JKingWeb\Arsse\Db\SQLite3\PDODriver;
+                } catch (\Exception $e) {
+                    return;
+                }
+            })(),
+            'PDO PostgreSQL' => (function() {
+                try {
+                    return new \JKingWeb\Arsse\Db\PostgreSQL\PDODriver;
+                } catch (\Exception $e) {
+                    return;
+                }
+            })(),
+        ];
+    }
+
     public function provideDbInterfaces(array $conf = []): array {
         $this->setConf($conf);
         return [
@@ -180,4 +208,83 @@ abstract class AbstractTest extends \PHPUnit\Framework\TestCase {
             ],
         ];
     }
+
+    public function getDbDriver(string $name, array $conf = []) {
+        $this->setConf($conf);
+        switch ($name) {
+            case 'SQLite 3':
+                return (function() {
+                    try {
+                        return new \JKingWeb\Arsse\Db\SQLite3\Driver;
+                    } catch (\Exception $e) {
+                        return;
+                    }
+                })();
+            case 'PDO SQLite 3':
+                return (function() {
+                    try {
+                        return new \JKingWeb\Arsse\Db\SQLite3\PDODriver;
+                    } catch (\Exception $e) {
+                        return;
+                    }
+                })();
+            case 'PDO PostgreSQL':
+                return (function() {
+                    try {
+                        return new \JKingWeb\Arsse\Db\PostgreSQL\PDODriver;
+                    } catch (\Exception $e) {
+                        return;
+                    }
+                })();
+            default:
+                throw new \Exception("Invalid database driver name");
+        }
+    }
+
+    public function getDbInterface(string $name, array $conf = []) {
+        $this->setConf($conf);
+        switch ($name) {
+            case 'SQLite 3':
+                return (function() {
+                    if (\JKingWeb\Arsse\Db\SQLite3\Driver::requirementsMet()) {
+                        try {
+                            $d = new \SQLite3(Arsse::$conf->dbSQLite3File);
+                        } catch (\Exception $e) {
+                            return;
+                        }
+                        $d->enableExceptions(true);
+                        return $d;
+                    }
+                })();
+            case 'PDO SQLite 3':
+                return (function() {
+                    if (\JKingWeb\Arsse\Db\SQLite3\PDODriver::requirementsMet()) {
+                        try {
+                            $d = new \PDO("sqlite:".Arsse::$conf->dbSQLite3File, "", "", [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION]);
+                            $d->exec("PRAGMA busy_timeout=0");
+                            return $d;
+                        } catch (\PDOException $e) {
+                            return;
+                        }
+                    }
+                })();
+            case 'PDO PostgreSQL':
+                return (function() {
+                    if (\JKingWeb\Arsse\Db\PostgreSQL\PDODriver::requirementsMet()) {
+                        $connString = \JKingWeb\Arsse\Db\PostgreSQL\Driver::makeConnectionString(true, Arsse::$conf->dbPostgreSQLUser, Arsse::$conf->dbPostgreSQLPass, Arsse::$conf->dbPostgreSQLDb, Arsse::$conf->dbPostgreSQLHost, Arsse::$conf->dbPostgreSQLPort, "");
+                        try {
+                            $c = new \PDO("pgsql:".$connString, Arsse::$conf->dbPostgreSQLUser, Arsse::$conf->dbPostgreSQLPass, [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION]);
+                        } catch (\PDOException $e) {
+                            return;
+                        }
+                        foreach (\JKingWeb\Arsse\Db\PostgreSQL\PDODriver::makeSetupQueries(Arsse::$conf->dbPostgreSQLSchema) as $q) {
+                            $c->exec($q);
+                        }
+                        return $c;
+                    }
+                })();
+            default:
+                throw new \Exception("Invalid database driver name");
+        }
+    }
 }
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 67914ae7..faf634e7 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -57,6 +57,7 @@
         <file>cases/Db/SQLite3PDO/TestUpdate.php</file>
 
         <file>cases/Db/PostgreSQL/TestCreation.php</file>
+        <file>cases/Db/PostgreSQL/TestDriver.php</file>
     </testsuite>
     <testsuite name="Database functions">
         <file>cases/Db/SQLite3/Database/TestMiscellany.php</file>