diff --git a/src/Token/AccessToken.php b/src/Token/AccessToken.php
index 1a5eb9c2..19052c96 100755
--- a/src/Token/AccessToken.php
+++ b/src/Token/AccessToken.php
@@ -7,38 +7,32 @@
 class AccessToken
 {
     /**
-     * @var  string  accessToken
+     * @var  string
      */
-    public $accessToken;
+    protected $accessToken;
 
     /**
-     * @var  int  expires
+     * @var  int
      */
-    public $expires;
+    protected $expires;
 
     /**
-     * @var  string  refreshToken
+     * @var  string
      */
-    public $refreshToken;
+    protected $refreshToken;
 
     /**
-     * @var  string  uid
+     * @var  string
      */
-    public $uid;
+    protected $uid;
 
     /**
-     * Sets the token, expiry, etc values.
-     *
-     * @param  array $options token options
-     * @return void
+     * @param array $options
      */
-    public function __construct(array $options = null)
+    public function __construct(array $options = [])
     {
         if (empty($options['access_token'])) {
-            throw new InvalidArgumentException(sprintf(
-                'Required option not passed: "%s"',
-                'access_token'
-            ));
+            throw new InvalidArgumentException('Required option not passed: "access_token"');
         }
 
         $this->accessToken = $options['access_token'];
@@ -65,6 +59,46 @@ public function __construct(array $options = null)
         }
     }
 
+    /**
+     * Get the access token.
+     *
+     * @return string
+     */
+    public function getToken()
+    {
+        return $this->accessToken;
+    }
+
+    /**
+     * Get the refresh token, if defined.
+     *
+     * @return string|null
+     */
+    public function getRefreshToken()
+    {
+        return $this->refreshToken;
+    }
+
+    /**
+     * Get the expiration timestamp, if defined.
+     *
+     * @return integer|null
+     */
+    public function getExpires()
+    {
+        return $this->expires;
+    }
+
+    /**
+     * Get the user identifier, if defined.
+     *
+     * @return string|null
+     */
+    public function getUid()
+    {
+        return $this->uid;
+    }
+
     /**
      * Returns the token key.
      *
@@ -72,6 +106,6 @@ public function __construct(array $options = null)
      */
     public function __toString()
     {
-        return (string) $this->accessToken;
+        return (string) $this->getToken();
     }
 }
diff --git a/test/src/Grant/RefreshTokenTest.php b/test/src/Grant/RefreshTokenTest.php
index 7576b1c9..99fd928c 100644
--- a/test/src/Grant/RefreshTokenTest.php
+++ b/test/src/Grant/RefreshTokenTest.php
@@ -2,6 +2,8 @@
 
 namespace League\OAuth2\Client\Test\Grant;
 
+use League\OAuth2\Client\Grant\RefreshToken;
+use League\OAuth2\Client\Test\Provider\Fake as MockProvider;
 use Mockery as m;
 
 class RefreshTokenTest extends \PHPUnit_Framework_TestCase
@@ -11,7 +13,7 @@ class RefreshTokenTest extends \PHPUnit_Framework_TestCase
 
     protected function setUp()
     {
-        $this->provider = new \League\OAuth2\Client\Test\Provider\Fake([
+        $this->provider = new MockProvider([
             'clientId' => 'mock_client_id',
             'clientSecret' => 'mock_secret',
             'redirectUri' => 'none',
@@ -37,10 +39,10 @@ public function testGetAccessToken()
         $token = $this->provider->getAccessToken('authorization_code', ['code' => 'mock_authorization_code']);
         $this->assertInstanceOf('League\OAuth2\Client\Token\AccessToken', $token);
 
-        $grant = new \League\OAuth2\Client\Grant\RefreshToken();
+        $grant = new RefreshToken();
         $this->assertEquals('refresh_token', (string) $grant);
 
-        $newToken = $this->provider->getAccessToken($grant, ['refresh_token' => $token->refreshToken]);
+        $newToken = $this->provider->getAccessToken($grant, ['refresh_token' => $token->getRefreshToken()]);
         $this->assertInstanceOf('League\OAuth2\Client\Token\AccessToken', $newToken);
     }
 
@@ -59,7 +61,7 @@ public function testInvalidRefreshToken()
 
         $token = $this->provider->getAccessToken('authorization_code', ['code' => 'mock_authorization_code']);
 
-        $grant = new \League\OAuth2\Client\Grant\RefreshToken();
-        $refreshToken = $this->provider->getAccessToken($grant, ['invalid_refresh_token' => $token->refreshToken]);
+        $grant = new RefreshToken();
+        $refreshToken = $this->provider->getAccessToken($grant, ['invalid_refresh_token' => $token->getRefreshToken()]);
     }
 }
diff --git a/test/src/Provider/AbstractProviderTest.php b/test/src/Provider/AbstractProviderTest.php
index d179fbdd..dd7e4850 100644
--- a/test/src/Provider/AbstractProviderTest.php
+++ b/test/src/Provider/AbstractProviderTest.php
@@ -296,9 +296,9 @@ public function testGetAccessToken()
         $result = $provider->getAccessToken($grant, ['code' => 'mock_authorization_code']);
 
         $this->assertSame($result, $token);
-        $this->assertSame($raw_response['uid'], $token->uid);
-        $this->assertSame($raw_response['access_token'], $token->accessToken);
-        $this->assertSame($raw_response['expires'], $token->expires);
+        $this->assertSame($raw_response['uid'], $token->getUid());
+        $this->assertSame($raw_response['access_token'], $token->getToken());
+        $this->assertSame($raw_response['expires'], $token->getExpires());
     }
 
     public function testErrorResponsesCanBeCustomizedAtTheProvider()
diff --git a/test/src/Token/AccessTokenTest.php b/test/src/Token/AccessTokenTest.php
index 2c4c5d43..8548c64a 100644
--- a/test/src/Token/AccessTokenTest.php
+++ b/test/src/Token/AccessTokenTest.php
@@ -2,6 +2,8 @@
 
 namespace League\OAuth2\Client\Test\Token;
 
+use League\OAuth2\Client\Token\AccessToken;
+
 class AccessTokenTest extends \PHPUnit_Framework_TestCase
 {
     /**
@@ -9,13 +11,18 @@ class AccessTokenTest extends \PHPUnit_Framework_TestCase
      */
     public function testInvalidRefreshToken()
     {
-        new \League\OAuth2\Client\Token\AccessToken(['invalid_access_token' => 'none']);
+        $token = new AccessToken(['invalid_access_token' => 'none']);
     }
 
     public function testExpiresInCorrection()
     {
-        $options = array('access_token' => 'access_token', 'expires_in' => 100);
-        $token = new \League\OAuth2\Client\Token\AccessToken($options);
-        $this->assertNotNull($token->expires);
+        $options = ['access_token' => 'access_token', 'expires_in' => 100];
+        $token = new AccessToken($options);
+
+        $expires = $token->getExpires();
+
+        $this->assertNotNull($expires);
+        $this->assertGreaterThan(time(), $expires);
+        $this->assertLessThan(time() + 200, $expires);
     }
 }