Fix tests

Author: morganchen12

FirebaseFacebookAuthUI/FirebaseFacebookAuthUITests/FirebaseFacebookAuthUITests.m

@@ -46,6 +46,11 @@ - (void)setUp {
   OCMStub(ClassMethod([self.mockOAuthProvider providerWithProviderID:OCMOCK_ANY])).
       andReturn(self.mockOAuthProvider);
 
+  id mockUtilsClass = OCMClassMock([FUIAuthUtils class]);
+  OCMStub(ClassMethod([mockUtilsClass bundleNamed:OCMOCK_ANY
+                                inFrameworkBundle:OCMOCK_ANY])).
+      andReturn([NSBundle bundleForClass:[FUIFacebookAuthTest class]]);
+
   FIRAuth *auth = [FIRAuth auth];
   self.authUI = [FUIAuth authUIWithAuth:auth];
   self.provider = [[FUIFacebookAuthTest alloc] initWithAuthUI:self.authUI];

FirebaseFacebookAuthUI/Sources/FUIFacebookAuth.m

@@ -318,8 +318,8 @@ - (void)configureProvider {
   NSString *facebookDisplayName = [bundle objectForInfoDictionaryKey:kFacebookDisplayName];
 
   if (facebookAppId == nil || facebookDisplayName == nil) {
-    // Always use the app bundle to look up Facebook values.
-    bundle = [NSBundle mainBundle];
+    // Executes in test targets only.
+    bundle = [FUIFacebookAuth bundle];
     facebookAppId = [bundle objectForInfoDictionaryKey:kFacebookAppId];
     facebookDisplayName = [bundle objectForInfoDictionaryKey:kFacebookDisplayName];
   }