improve test coverage

Author: barryvdh

tests/Omnipay/Common/CreditCardTest.php

@@ -358,6 +358,13 @@ public function testShouldReturnTrack2()
         $this->assertEquals(';4242424242424242=15201269999944401?', $actual);
     }
 
+    public function testShouldReturnNoTrack()
+    {
+        $this->card->setTracks(null);
+        $actual = $this->card->getTrack2();
+        $this->assertNull($actual);
+    }
+
     public function testIssueNumber()
     {
         $this->card->setIssueNumber('12');

tests/Omnipay/Common/Message/AbstractResponseTest.php

@@ -7,6 +7,9 @@
 
 class AbstractResponseTest extends TestCase
 {
+    /** @var  AbstractResponse */
+    protected $response;
+
     public function setUp()
     {
         $this->response = m::mock('\Omnipay\Common\Message\AbstractResponse')->makePartial();
@@ -32,6 +35,9 @@ public function testDefaultMethods()
         $this->assertNull($this->response->getTransactionReference());
         $this->assertNull($this->response->getMessage());
         $this->assertNull($this->response->getCode());
+        $this->assertNull($this->response->getRedirectUrl());
+        $this->assertEquals('GET', $this->response->getRedirectMethod());
+        $this->assertEquals([], $this->response->getRedirectData());
     }
 
     /**