Unit Testing and Encapsulation

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Week 2

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Types of Testing

• Unit
  • Testing small parts of code
  • Smallest thing you can test stand alone

• Functional

• Intergration
  • Functions that call other functions
  • Classes that use other classes
• End to End
  • Multiple apps working together

Unit Tests

• Everything works like I think its supposed to
• Incorrect usage has fallback

/*
Class invariant: Value is always between 0.0 and 100.0 (Guarenteed, promise)
  Write tests to verify this is always true
*/

class Percentage {
  public double Value {
    get{return value;};
    set(double newValue) {
      if (newValue < 0.0 || newValue > 100) {
        throw newInvalidArgumentException();
      }
      value = newValue;
    }
  } 
}

Class invariants should be true throughout the life of the object

constructor
|
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| Method Calls
|
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destructor / Garbage collector