Add one more test case

Author: ecastro98

src/Mta.php

@@ -72,7 +72,7 @@ public function getResource(string $resourceName): MtaResource
     {
         $resource = $this->resources->findByName($resourceName);
 
-        if (!$resource) {
+        if (empty($resource)) {
             $resource = new MtaResource($resourceName, $this);
             $this->resources->add($resource);
         }

tests/Functional/MtaTest.php

@@ -49,4 +49,13 @@ public function testItPrintsSomeJson()
         Mta::doReturn('someValue1', 'someValue2');
         $this->expectOutputString('["someValue1","someValue2"]');
     }
+
+    public function testItReturnResource()
+    {
+        $server = $this->createMock(Server::class);
+        $credential = $this->createMock(Credential::class);
+        $mta = new Mta($server, $credential);
+
+        $this->assertInstanceOf(Resource::class, $mta->getResource('someResource'));
+    }
 }