public void Delegates_MagicClass_NoModifierRegisteredResultsInUnchangedValue()
{
var testObject = new MagicClass(10);
var actual = testObject.ApplyModifiers();
Assert.AreEqual(10, actual);
}
public void Delegates_MagicClass_ModifiersAlterValueCorrectly()
{
var testObject = new MagicClass(5);
testObject.ValueModifier += delegate (int result)
{
return result + 10;
};
testObject.ValueModifier += delegate (int result)
{
return (result + 2) / 2;
};
var actual = testObject.ApplyModifiers();
Assert.AreEqual(13, actual);
// Explanation:
// 1. At the beginning there was an initial value equaled to 5.
// 2. Then the second callback function was applied to the previous result so the new result equals 3, i. e. (5 + 2) / 2 = 3.
// 3. Afterwards the first callback was applied to the previous result and the final result was returned (because no more modifier was registered), i. e. 3 + 10 = 13
}