fix mocks

tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php

@@ -78,7 +78,7 @@ class GitHubDriverTest extends TestCase
 
         $remoteFilesystem->expects($this->at(1))
             ->method('getContents')
-            ->with($this->equalTo('github.com'), $this->equalTo('https://api.github.com/rate_limit'), $this->equalTo(false))
+            ->with($this->equalTo('github.com'), $this->equalTo('https://api.github.com'), $this->equalTo(false))
             ->will($this->returnValue('{}'));
 
         $remoteFilesystem->expects($this->at(2))

tests/Composer/Test/Util/GitHubTest.php

@@ -50,7 +50,7 @@ class GitHubTest extends \PHPUnit_Framework_TestCase
             ->method('getContents')
             ->with(
                 $this->equalTo($this->origin),
-                $this->equalTo(sprintf('https://api.%s/rate_limit', $this->origin)),
+                $this->equalTo(sprintf('https://api.%s', $this->origin)),
                 $this->isFalse(),
                 $this->anything()
             )