Add model test.

Author: SilasKenneth

tests/Models/PageResultTest.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Microsoft\Graph\Core\Test\Models;
+
+use Microsoft\Graph\Core\Models\PageResult;
+use Microsoft\Kiota\Serialization\Json\JsonSerializationWriter;
+use Microsoft\Kiota\Serialization\Json\JsonSerializationWriterFactory;
+use PHPUnit\Framework\TestCase;
+
+class PageResultTest extends TestCase
+{
+    public function testCanSetAndGetValues(): void {
+        $pageResult = new PageResult();
+        $writer = (new JsonSerializationWriterFactory())->getSerializationWriter('application/json');
+        $pageResult->setValue([['name' => 'Kenny'], ['name' => 'James']]);
+        $this->assertCount(2, $pageResult->getValue());
+        $pageResult->setOdataNextLink('nextPage');
+        $this->assertEquals('nextPage', $pageResult->getOdataNextLink());
+        $pageResult->serialize($writer);
+
+        $this->assertEquals('"@odata.nextLink":"nextPage","value":[{"name":"Kenny"},{"name":"James"}]', $writer->getSerializedContent()->getContents());
+    }
+}