add endpoint for server-side exclude setting

tests/Endpoints/ZoneSettingsTest.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+use Cloudflare\API\Adapter\Adapter;
+use Cloudflare\API\Endpoints\ZoneSettings;
+
+class ZoneSettingsTest extends TestCase
+{
+    public function testGetServerSideExcludeSetting()
+    {
+        $response = $this->getPsr7JsonResponseForFixture('Endpoints/getServerSideExclude.json');
+
+        $mock = $this->getMockBuilder(Adapter::class)->getMock();
+        $mock->method('get')->willReturn($response);
+
+        $mock->expects($this->once())->method('get');
+
+        $zones = new ZoneSettings($mock);
+        $result = $zones->getServerSideExcludeSetting('023e105f4ecef8ad9ca31a8372d0c353');
+
+        $this->assertSame('on', $result);
+    }
+
+    public function testUpdateServerSideExcludeSetting()
+    {
+        $response = $this->getPsr7JsonResponseForFixture('Endpoints/updateServerSideExclude.json');
+
+        $mock = $this->getMockBuilder(Adapter::class)->getMock();
+        $mock->method('patch')->willReturn($response);
+
+        $mock->expects($this->once())->method('patch');
+
+        $zones = new ZoneSettings($mock);
+        $result = $zones->updateServerSideExcludeSetting('023e105f4ecef8ad9ca31a8372d0c353', 'on');
+
+        $this->assertSame('on', $result);
+    }
+}