Fix tests on windows.

Minor: fopen('/dev/null', 'r') is not cross-platform.

As much as this will run in a *nix environment.
I like to run test-suites on ANY reasonable machine.

Author: Lewiscowles1986

tests/curl_and_error_log_function_stubs.php

@@ -24,7 +24,7 @@ function curl_init($url = null)
 
     $curlSpy->curlInitWasCalledWithArg($url);
 
-    $resource = fopen('/dev/null', 'r');
+    $resource = tmpfile();
 
     $curlSpy->curlInitDidReturn($resource);
 

tests/socket_function_stubs.php

@@ -29,7 +29,7 @@ function socket_create($domain, $type, $protocol)
 
     // A PHP resource of unimportance, useful primarily to assert that our stubs
     // of the global socket functions return or take a deterministic value.
-    $resource = fopen('/dev/null', 'r');
+    $resource = tmpfile();
 
     $socketSpy->socketCreateDidReturn($resource);