XCode On MAC OS

object c ;
http://www.tutorialspoint.com/objective_c/objective_c_inheritance.htm
http://codewithchris.com/first-xcode-project/https://www.cs.drexel.edu/~mcs171/Sp07/extras/xCode_Instructions/index.html

unittest
https://github.com/khanlou/Objective-Shorthand/blob/master/Objective-ShorthandTests/SKArrayFunctionalMethodsTest.m
https://developer.apple.com/legacy/library/documentation/DeveloperTools/Conceptual/UnitTesting/00-About_Unit_Testing/about.html#//apple_ref/doc/uid/TP40002143-CH1-SW1
testhttp://iosunittesting.com/
https://developer.apple.com/legacy/library/documentation/DeveloperTools/Conceptual/UnitTesting/05-Running_Unit_Tests/running.html#//apple_ref/doc/uid/TP40002143-CH6-SW1
http://www.cocoawithlove.com/2009/12/sample-mac-application-with-complete.html

http://www.cocoawithlove.com/2009/12/sample-mac-application-with-complete.html

http://codewithchris.com/xcode-tutorial/