diff --git a/src/OpenIDConnectClient.php b/src/OpenIDConnectClient.php
index adabf80c..60f89bd8 100644
--- a/src/OpenIDConnectClient.php
+++ b/src/OpenIDConnectClient.php
@@ -3,7 +3,7 @@
  *
  * Copyright MITRE 2020
  *
- * OpenIDConnectClient for PHP5
+ * OpenIDConnectClient for PHP7+
  * Author: Michael Jett <mjett@mitre.org>
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -25,7 +25,6 @@
 
 use Error;
 use Exception;
-use phpseclib3\Crypt\PublicKeyLoader;
 use phpseclib3\Crypt\RSA;
 use phpseclib3\Math\BigInteger;
 use stdClass;
@@ -380,7 +379,7 @@ public function authenticate(): bool
             $accessToken = $_REQUEST['access_token'] ?? null;
 
             // Do an OpenID Connect session check
-	    if (!isset($_REQUEST['state']) || ($_REQUEST['state'] !== $this->getState())) {            
+    	    if (!isset($_REQUEST['state']) || ($_REQUEST['state'] !== $this->getState())) {
                 throw new OpenIDConnectClientException('Unable to determine state');
             }
 
@@ -691,7 +690,7 @@ public function getRedirectURL(): string
         if (isset($_SERVER['HTTP_X_FORWARDED_PORT'])) {
             $port = (int)$_SERVER['HTTP_X_FORWARDED_PORT'];
         } elseif (isset($_SERVER['SERVER_PORT'])) {
-            $port = (int)$_SERVER['SERVER_PORT'];
+            $port = $_SERVER['SERVER_PORT'];
         } elseif ($protocol === 'https') {
             $port = 443;
         } else {
@@ -1221,10 +1220,9 @@ protected function urlEncode(string $str): string
     /**
      * @param string $jwt encoded JWT
      * @param int $section the section we would like to decode
-     * @return object
+     * @return object|null
      */
-    protected function decodeJWT(string $jwt, int $section = 0): stdClass {
-
+    protected function decodeJWT(string $jwt, int $section = 0) {
         $parts = explode('.', $jwt);
         return json_decode(base64url_decode($parts[$section]), false);
     }
@@ -1688,7 +1686,10 @@ public function revokeToken(string $token, string $token_type_hint = '', string
         return json_decode($this->fetchURL($revocation_endpoint, $post_params, $headers), false);
     }
 
-    public function getClientName(): string
+    /**
+     * @return string|null
+     */
+    public function getClientName()
     {
         return $this->clientName;
     }
@@ -1698,14 +1699,14 @@ public function setClientName(string $clientName) {
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getClientID() {
         return $this->clientID;
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getClientSecret() {
         return $this->clientSecret;
@@ -1720,17 +1721,26 @@ public function setAccessToken(string $accessToken) {
         $this->accessToken = $accessToken;
     }
 
-    public function getAccessToken(): string
+    /**
+     * @return string|null
+     */
+    public function getAccessToken()
     {
         return $this->accessToken;
     }
 
-    public function getRefreshToken(): string
+    /**
+     * @return string|null
+     */
+    public function getRefreshToken()
     {
         return $this->refreshToken;
     }
 
-    public function getIdToken(): string
+    /**
+     * @return string|null
+     */
+    public function getIdToken()
     {
         return $this->idToken;
     }
diff --git a/tests/OpenIDConnectClientTest.php b/tests/OpenIDConnectClientTest.php
index f895879c..88d98989 100644
--- a/tests/OpenIDConnectClientTest.php
+++ b/tests/OpenIDConnectClientTest.php
@@ -7,9 +7,38 @@
 
 class OpenIDConnectClientTest extends TestCase
 {
-    /**
-     * @return void
-     */
+    public function testJWTDecode()
+    {
+        $client = new OpenIDConnectClient();
+        $client->setAccessToken('');
+        $header = $client->getAccessTokenHeader();
+        self::assertEquals('', $header);
+    }
+
+    public function testGetNull()
+    {
+        $client = new OpenIDConnectClient();
+        self::assertNull($client->getAccessToken());
+        self::assertNull($client->getRefreshToken());
+        self::assertNull($client->getIdToken());
+        self::assertNull($client->getClientName());
+        self::assertNull($client->getClientID());
+        self::assertNull($client->getClientSecret());
+        self::assertNull($client->getCertPath());
+    }
+
+    public function testResponseTypes()
+    {
+        $client = new OpenIDConnectClient();
+        self::assertEquals([], $client->getResponseTypes());
+
+        $client->setResponseTypes('foo');
+        self::assertEquals(['foo'], $client->getResponseTypes());
+
+        $client->setResponseTypes(['bar', 'ipsum']);
+        self::assertEquals(['foo', 'bar', 'ipsum'], $client->getResponseTypes());
+    }
+
     public function testGetRedirectURL()
     {
         $client = new OpenIDConnectClient();