Finish tests

- Add sub-doc handling for SQLite fields
- Add casting for PostgreSQL BT on numeric value
- Add hasItems() to DocumentList
- Fix SQL syntax problems exposed by tests

tests/unit/QueryTest.php

@@ -2,7 +2,7 @@
 
 namespace Test\Unit;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{Configuration, Field, Mode, Query};
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
 
@@ -11,6 +11,16 @@ use PHPUnit\Framework\TestCase;
  */
 class QueryTest extends TestCase
 {
+    protected function setUp(): void
+    {
+        Configuration::$mode = Mode::SQLite;
+    }
+
+    protected function tearDown(): void
+    {
+        Configuration::$mode = null;
+    }
+
     public function testSelectFromTableSucceeds(): void
     {
         $this->assertEquals('SELECT data FROM testing', Query::selectFromTable('testing'),