implemented PullRequests::diff (API 2.0)

Author: vimishor

docs/repositories/pullrequests.md

@@ -72,6 +72,11 @@ $pull->approve($account_name, $repo_slug, 1);
 $pull->delete($account_name, $repo_slug, 1);
 ```
 
+### Get the diff for a pull request:
+```php
+$pull->diff($account_name, $repo_slug, 1);
+```
+
 ----
 
 #### Related:

lib/Bitbucket/API/Repositories/PullRequests.php

@@ -195,4 +195,20 @@ public function deleteApproval($account, $repo, $id)
             sprintf('repositories/%s/%s/pullrequests/%d/approve', $account, $repo, $id)
         );
     }
+
+    /**
+     * Get the diff for a pull request
+     *
+     * @access public
+     * @param  string           $account The team or individual account owning the repository.
+     * @param  string           $repo    The repository identifier.
+     * @param  int              $id      ID of the pull request
+     * @return MessageInterface
+     */
+    public function diff($account, $repo, $id)
+    {
+        return $this->getClient()->setApiVersion('2.0')->get(
+            sprintf('repositories/%s/%s/pullrequests/%d/diff', $account, $repo, $id)
+        );
+    }
 }

test/Bitbucket/Tests/API/Repositories/PullRequestsTest.php

@@ -200,4 +200,22 @@ public function testDeletePullRequestApproval()
 
         $pull->deleteApproval('gentle', 'eof', 1);
     }
+
+    public function testGetPullRequestDiff()
+    {
+        $endpoint       = 'repositories/gentle/eof/pullrequests/1/diff';
+        $expectedResult = $this->fakeResponse(array('dummy'));
+
+        $client = $this->getHttpClientMock();
+        $client->expects($this->once())
+            ->method('get')
+            ->with($endpoint)
+            ->will($this->returnValue($expectedResult));
+
+        /** @var \Bitbucket\API\Repositories\PullRequests $pull */
+        $pull   = $this->getClassMock('Bitbucket\API\Repositories\PullRequests', $client);
+        $actual = $pull->diff('gentle', 'eof', 1);
+
+        $this->assertEquals($expectedResult, $actual);
+    }
 }