Initial SQLite development (#1)

Reviewed-on: #1

tests/unit/Mapper/ExistsMapperTest.php

@@ -0,0 +1,43 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Mapper;
+
+use BitBadger\PDODocument\{Configuration, DocumentException, Mode};
+use BitBadger\PDODocument\Mapper\ExistsMapper;
+use PHPUnit\Framework\Attributes\TestDox;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the ExistsMapper class
+ */
+class ExistsMapperTest extends TestCase
+{
+    #[TestDox('Map succeeds for PostgreSQL')]
+    public function testMapSucceedsForPostgreSQL(): void
+    {
+        try {
+            Configuration::$mode = Mode::PgSQL;
+            $this->assertFalse((new ExistsMapper())->map([false, 'nope']), 'Result should have been false');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    #[TestDox('Map succeeds for SQLite')]
+    public function testMapSucceedsForSQLite(): void
+    {
+        try {
+            Configuration::$mode = Mode::SQLite;
+            $this->assertTrue((new ExistsMapper())->map([1, 'yep']), 'Result should have been true');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    public function testMapFailsWhenModeNotSet(): void
+    {
+        $this->expectException(DocumentException::class);
+        Configuration::$mode = null;
+        (new ExistsMapper())->map(['0']);
+    }
+}