[Tests] Extract fixture logic from ApiTest

- Reorder frio scheme tests to avoid PConfig persistence side-effect

tests/FixtureTest.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * FixtureTest class.
+ */
+
+namespace Friendica\Test;
+
+use Dice\Dice;
+use Friendica\Core\Config\Cache;
+use Friendica\Core\Config\IConfig;
+use Friendica\Core\Session;
+use Friendica\Core\Session\ISession;
+use Friendica\Database\Database;
+use Friendica\Database\DBStructure;
+use Friendica\DI;
+use Friendica\Test\Util\Database\StaticDatabase;
+
+/**
+ * Parent class for test cases requiring fixtures
+ */
+abstract class FixtureTest extends DatabaseTest
+{
+	/** @var Dice */
+	protected $dice;
+
+	/**
+	 * Create variables used by tests.
+	 */
+	protected function setUp()
+	{
+		parent::setUp();
+
+		$this->dice = (new Dice())
+			->addRules(include __DIR__ . '/../static/dependencies.config.php')
+			->addRule(Database::class, ['instanceOf' => StaticDatabase::class, 'shared' => true])
+			->addRule(ISession::class, ['instanceOf' => Session\Memory::class, 'shared' => true, 'call' => null]);
+		DI::init($this->dice);
+
+		/** @var IConfig $config */
+		$configCache = $this->dice->create(Cache::class);
+		$configCache->set('database', 'disable_pdo', true);
+
+		/** @var Database $dba */
+		$dba = $this->dice->create(Database::class);
+
+		$dba->setTestmode(true);
+
+		DBStructure::checkInitialValues();
+
+		// Load the API dataset for the whole API
+		$this->loadFixture(__DIR__ . '/datasets/api.fixture.php', $dba);
+	}
+}