Add classes and tests from common project

tests/unit/Query/FindTest.php

@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query\Find;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Find class
+ */
+class FindTest extends TestCase
+{
+    public function testByIdSucceeds(): void
+    {
+        $this->assertEquals("SELECT data FROM here WHERE data->>'id' = @id", Find::byId('here'),
+            'SELECT query not generated correctly');
+    }
+
+    public function testByFieldsSucceeds(): void
+    {
+        $this->assertEquals("SELECT data FROM there WHERE data->>'active' = @act OR data->>'locked' = @lock",
+            Find::byFields('there', [Field::EQ('active', true, '@act'), Field::EQ('locked', true, '@lock')], 'OR'),
+            'SELECT query not generated correctly');
+    }
+}