Migrate tests to Pest (#8)

Reviewed-on: #8

tests/Unit/FieldMatchTest.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * @author Daniel J. Summers <daniel@bitbadger.solutions>
+ * @license MIT
+ */
+
+declare(strict_types=1);
+
+use BitBadger\PDODocument\FieldMatch;
+
+pest()->group('unit');
+
+describe('->toSQL()', function () {
+    test('returns AND for All', function () {
+        expect(FieldMatch::All)->toSQL()->toBe('AND');
+    });
+    test('returns OR for Any', function () {
+        expect(FieldMatch::Any)->toSQL()->toBe('OR');
+    });
+});