Testing in iOS - Part 8: Red Green Refactor | Ray Wenderlich

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There are many strategies for writing unit tests and one of them is called the Red Green Refactor. This video walks you through it.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/3530-testing-in-ios/lessons/8
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What is mean of Private (set) ?

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That’s how you define a read-only property - you can access the value of the property fine from other classes, but you can’t set the value of the property from other classes. You can only set the value of the property from within the class which owns the property.