PHP: Add an Approval base test similar to Java-Approvals and CS-xunit-verify.

php/tests/ApprovalTest.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use GildedRose\GildedRose;
+use GildedRose\Item;
+use PHPUnit\Framework\TestCase;
+use ApprovalTests\Approvals;
+
+/**
+ * This unit test uses [Approvals](https://github.com/approvals/ApprovalTests.php).
+ * 
+ * There are two test cases here with different styles:
+ * <li>"foo" is more similar to the unit test from the 'Java' version
+ * <li>"thirtyDays" is more similar to the TextTest from the 'Java' version
+ *
+ * I suggest choosing one style to develop and deleting the other.
+ */
+class ApprovalTest extends TestCase
+{
+
+	public function testFoo(): void
+    {
+        $items = [new Item('foo', 0, 0)];
+        $app = new GildedRose($items);
+        $app->updateQuality();
+
+		Approvals::verifyList($items);
+	}
+
+    public function testThirtyDays(): void
+     {
+        ob_start();
+
+        $argv = ["", "30"];
+        include(__DIR__.'/../fixtures/texttest_fixture.php');
+        
+        $output = ob_get_clean();
+
+        Approvals::approveString($output);
+    }
+}