Trying to solve issue #47 in a tricky case when OHHTTPStubs is used both in the App target and the UnitTest targets, in the case UnitTests use the App as their host app (which is the default for new Xcode5 projects)

In such case, two OHHTTPStubs classes where loaded (one in the App Bundle, one in the Test bundle), leading to double swizzling, but only the first OHHTTPStubsProtocol (generally the one loaded by the app bundle) were used, leading to stubs from UnitTest bundle not being called.

To fix this, I now:

* The swizzling of `NSURLSessionConfiguration` is done using an `NSURLSessionConfiguration` category and its `+load` method to be done only once (much more logical by the way) to avoid double-swizzling (and a callstack overflow)
* The insertion of the `OHHTTPStubsProtocol` class in the `protocolClasses` property is done via `[OHHTTPStubs setEnabled:forSessionConfiguration:]` (instead of relying to `objc_getClass()`), to be sure that it uses the `OHHTTPStubsProtocol` class  loaded by the current `NSBundle` (and not the one returned by objc_getClass() which is generally the one from the `mainBundle` / App bundle)

Author: AliSoftware

OHHTTPStubs.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name         = "OHHTTPStubs"
-  s.version      = "3.0.3"
+  s.version      = "3.0.4"
 
   s.summary      = "Stubbing framework for network requests."
   s.description  = <<-DESC

OHHTTPStubs/Sources/OHHTTPStubs+NSURLSessionConfiguration.m

@@ -40,41 +40,31 @@ static SessionConfigConstructor OHHTTPStubsSwizzle(SEL selector, SessionConfigCo
     return origImpl;
 }
 
-static void OHHTTPStubsAddProtocolClassToNSURLSessionConfiguration(NSURLSessionConfiguration* config)
-{
-    NSMutableArray* protocolClasses = [NSMutableArray arrayWithArray:config.protocolClasses];
-    // objc_getClass loads the class in the ObjC Runtime if not loaded at that time, so it's secure.
-    Class protocolClass = objc_getClass("OHHTTPStubsProtocol");
-    if (![protocolClasses containsObject:protocolClass])
-        [protocolClasses addObject:protocolClass];
-    config.protocolClasses = protocolClasses;
-}
-
 static NSURLSessionConfiguration* OHHTTPStubs_defaultSessionConfiguration(id self, SEL _cmd)
 {
     NSURLSessionConfiguration* config = orig_defaultSessionConfiguration(self,_cmd); // call original method
-    OHHTTPStubsAddProtocolClassToNSURLSessionConfiguration(config);
+    [OHHTTPStubs setEnabled:YES forSessionConfiguration:config]; //OHHTTPStubsAddProtocolClassToNSURLSessionConfiguration(config);
     return config;
 }
 
 static NSURLSessionConfiguration* OHHTTPStubs_ephemeralSessionConfiguration(id self, SEL _cmd)
 {
     NSURLSessionConfiguration* config = orig_ephemeralSessionConfiguration(self,_cmd); // call original method
-    OHHTTPStubsAddProtocolClassToNSURLSessionConfiguration(config);
+    [OHHTTPStubs setEnabled:YES forSessionConfiguration:config]; //OHHTTPStubsAddProtocolClassToNSURLSessionConfiguration(config);
     return config;
 }
 
-void _OHHTTPStubs_InstallNSURLSessionConfigurationMagicSupport()
+@interface NSURLSessionConfiguration(OHHTTPStubsSupport) @end
+@implementation NSURLSessionConfiguration(OHHTTPStubsSupport)
++(void)load
 {
     orig_defaultSessionConfiguration = OHHTTPStubsSwizzle(@selector(defaultSessionConfiguration),
                                                           OHHTTPStubs_defaultSessionConfiguration);
     orig_ephemeralSessionConfiguration = OHHTTPStubsSwizzle(@selector(ephemeralSessionConfiguration),
                                                             OHHTTPStubs_ephemeralSessionConfiguration);
 }
+@end
 
-#else
-void _OHHTTPStubs_InstallNSURLSessionConfigurationMagicSupport()
-{
-    /* NO-OP for Xcode4 and pre-iOS7/pre-OSX9 SDKs that does not support NSURLSessionConfiguration */
-}
 #endif
+
+

OHHTTPStubs/Sources/OHHTTPStubs.m

@@ -101,14 +101,11 @@ + (instancetype)sharedInstance
 ////////////////////////////////////////////////////////////////////////////////
 #pragma mark - Setup & Teardown
 
-extern void _OHHTTPStubs_InstallNSURLSessionConfigurationMagicSupport();
-
 + (void)initialize
 {
     if (self == [OHHTTPStubs class])
     {
         [self setEnabled:YES];
-        _OHHTTPStubs_InstallNSURLSessionConfigurationMagicSupport();
     }
 }
 - (id)init
@@ -182,7 +179,7 @@ + (void)setEnabled:(BOOL)enable forSessionConfiguration:(NSURLSessionConfigurati
         {
             [urlProtocolClasses addObject:protoCls];
         }
-        else if (!enable  && [urlProtocolClasses containsObject:protoCls])
+        else if (!enable && [urlProtocolClasses containsObject:protoCls])
         {
             [urlProtocolClasses removeObject:protoCls];
         }