Summary

--- primaryColor: '#512888' secondaryColor: '#cccccc' textColor: black shuffleQuestions: true shuffleAnswers: true locale: en --- # Test Doubles **Test doubles** are best described by which of the following statements? 1. [X] Temporary objects in unit tests to mimic functionality 1. [ ] Duplicate unit tests used to confirm results 1. [ ] Floating-point values used to test arithmetic methods 1. [ ] Abstract methods with no actual implementation # Separation of Concerns The design principle **separation of concerns** is best described by which statement? 1. [X] Breaking a larger system into distinct sections for a particular task 1. [ ] Preventing the user from editing system data in an application 1. [ ] Sandboxing user interface elements from the underlying program 1. [ ] Writing and debugging one part of a program at a time # Reason for Test Doubles Which of the following is a major reason to use test doubles in unit tests? 1. [X] To replace other methods with versions that will always work 1. [ ] To reduce the amount of code in our unit tests 1. [ ] To repeatedly test other parts of the application 1. [ ] To ensure a test never fails # Uses of Test Doubles Which of the following was **not** given as a possible use of test doubles? 1. [X] Measure how long an operation takes to perform 1. [ ] Verify a method is called from our code 1. [ ] Produce fake data that our code can operate on 1. [ ] Enure our code updates data in another module 1. [ ] Observe how many times our code builds a particular object # Unit Test Pattern Place the steps of the common unit test structure below in the correct order. (Click and drag to reorder elements) 1. Arrange 2. Act 3. Assert # Behavior-Driven Development Place the steps of the **behavior-driven development** structure below in the correct order. (Click and drag to reorder elements) 1. Given 2. When 3. Then # Stub According to the text, a **stub** is best described by which statement? 1. [X] An object that returns predefined data when its methods are called 1. [ ] An object that implements all public methods but may use shortcuts to produce results 1. [ ] An object used to listen for incoming method calls 1. [ ] An object that contains several abstract variables # Fake According to the text, a **fake** is best described by which statement? 1. [ ] An object that returns predefined data when its methods are called 1. [X] An object that implements all public methods but may use shortcuts to produce results 1. [ ] An object used to listen for incoming method calls 1. [ ] An object that contains several abstract variables # Mock According to the text, a **mock object** is best described by which statement? 1. [ ] An object that returns predefined data when its methods are called 1. [ ] An object that implements all public methods but may use shortcuts to produce results 1. [X] An object used to listen for incoming method calls 1. [ ] An object that contains several abstract variables # Naming True or false: the names **stub**, **mock** and **fake** are used consistently across languages and frameworks? 1. [ ] True 1. [X] False # Dependency Injection The concept of **dependency injection** is best described by which statement? 1. [X] Building a class so that external objects can be added from outside 1. [ ] Ensuring that all variables and methods are public 1. [ ] Designing a class to construct its own external objects as needed 1. [ ] Only using external libraries from reputable sources