Fixed some tests.

Author: Edward Smith

Branch-SDK-Tests/Branch-SDK-Tests/BNCKeyChain.Test.m

@@ -83,6 +83,10 @@ - (void)testKeyChain {
 }
 
 - (void) testSecurityAccessGroup {
+    if ([UIApplication sharedApplication] == nil) {
+        NSLog(@"No host application for keychain testing!");
+        return;
+    }
     NSString *group = [BNCKeyChain securityAccessGroup];
     XCTAssert(group.length > 0);
 }

Branch-SDK/Branch-SDK/BNCKeyChain.m

@@ -221,6 +221,10 @@ + (NSString*_Nullable) securityAccessGroup {
         static NSString*_securityAccessGroup = nil;
         if (_securityAccessGroup) return _securityAccessGroup;
 
+        // First store a value:
+        NSError*error = [self storeValue:@"Value" forService:@"BranchKeychainService" key:@"Temp" cloudAccessGroup:nil];
+        if (error) BNCLogDebugSDK(@"Error storing temp value: %@.", error);
+        
         NSDictionary* dictionary = @{
             (__bridge id)kSecClass:                 (__bridge id)kSecClassGenericPassword,
             (__bridge id)kSecReturnAttributes:      (__bridge id)kCFBooleanTrue,