add "event subscription get" endpoint

Author: Sysix

README.md

@@ -115,10 +115,10 @@ $response = $api->downPaymentInvoice()->document($entityId, true, 'application/x
 
 ### Event Subscriptions Endpooint
 ```php
-// TODO: get
-$response = $api->voucher()->create($data);
-$response = $api->voucher()->delete($entityId);
-$response = $api->voucher()->getAll();
+$response = $api->event()->get($entityId);
+$response = $api->event()->create($data);
+$response = $api->event()->delete($entityId);
+$response = $api->event()->getAll();
 ```
 
 ### File Endpoint

src/Clients/Event.php

@@ -8,10 +8,12 @@
 use Sysix\LexOffice\BaseClient;
 use Sysix\LexOffice\Clients\Traits\CreateTrait;
 use Sysix\LexOffice\Clients\Traits\DeleteTrait;
+use Sysix\LexOffice\Clients\Traits\GetTrait;
 
 class Event extends BaseClient
 {
     use CreateTrait;
+    use GetTrait;
     use DeleteTrait;
 
     protected string $resource = 'event-subscriptions';

tests/Clients/EventTest.php

@@ -27,6 +27,21 @@ public function testCreate(): void
         );
     }
 
+    public function testGet(): void
+    {
+        [$api, $stub] = $this->createClientMockObject(Event::class);
+
+        $response = $stub->get('resource-id');
+
+        $this->assertInstanceOf(ResponseInterface::class, $response);
+
+        $this->assertEquals('GET', $api->getRequest()->getMethod());
+        $this->assertEquals(
+            $api->apiUrl . '/v1/event-subscriptions/resource-id',
+            $api->getRequest()->getUri()->__toString()
+        );
+    }
+
     public function testDelete(): void
     {
         [$api, $stub] = $this->createClientMockObject(Event::class);