Created more unit tests

module/Rest/test/Action/Visit/GlobalVisitsActionTest.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\Rest\Action\Visit;
+
+use Laminas\Diactoros\Response\JsonResponse;
+use Laminas\Diactoros\ServerRequestFactory;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Prophecy\ObjectProphecy;
+use Shlinkio\Shlink\Core\Visit\Model\VisitsStats;
+use Shlinkio\Shlink\Core\Visit\VisitsStatsHelperInterface;
+use Shlinkio\Shlink\Rest\Action\Visit\GlobalVisitsAction;
+
+class GlobalVisitsActionTest extends TestCase
+{
+    private GlobalVisitsAction $action;
+    private ObjectProphecy $helper;
+
+    public function setUp(): void
+    {
+        $this->helper = $this->prophesize(VisitsStatsHelperInterface::class);
+        $this->action = new GlobalVisitsAction($this->helper->reveal());
+    }
+
+    /** @test */
+    public function statsAreReturnedFromHelper(): void
+    {
+        $stats = new VisitsStats(5);
+        $getStats = $this->helper->getVisitsStats()->willReturn($stats);
+
+        /** @var JsonResponse $resp */
+        $resp = $this->action->handle(ServerRequestFactory::fromGlobals());
+        $payload = $resp->getPayload();
+
+        $this->assertEquals($payload, ['visits' => $stats]);
+        $getStats->shouldHaveBeenCalledOnce();
+    }
+}