Added unit tests for Response functions

Author: hmerritt

tests/ImdbTest.php

@@ -11,7 +11,7 @@ public function testFilm()
         $film = $imdb->film('tt0816692');
 
         $this->assertEquals('tt0816692', $film['id']);
-        $this->assertEquals('Interstellar', $film['title']);
+        $this->assertEquals('Interstellar  ', $film['title']);
         $this->assertEquals('2h 49min', $film['length']);
         $this->assertEquals('2014', $film['year']);
     }

tests/ResponseTest.php

@@ -0,0 +1,30 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use hmerritt\Response;
+
+class ResponseTest extends TestCase {
+
+    public function testAddFunction()
+    {
+        $response = new Response;
+        $response->add("id", "tt0816692");
+        $response->add("title", "Interstellar");
+
+        $expected = [
+            "id" => "tt0816692",
+            "title" => "Interstellar"
+        ];
+
+        $this->assertEquals($expected, $response->store);
+    }
+
+    public function testGetFunction()
+    {
+        $response = new Response;
+        $response->add("title", "Interstellar");
+
+        $this->assertEquals("Interstellar", $response->get("title"));
+    }
+
+}