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Do you write unit tests for abstract classes?
We can use abstract classes in many more scenarios depending upon the design followed. Also, writing unit tests for abstract class methods is as important as for normal classes and methods. We can test each of them using different techniques or different test support libraries available.
Can abstract class have concrete subclasses?
An abstract class cannot be instantiated directly, i.e. the object of such class cannot be created directly using the new keyword. An abstract class can be instantiated either by a concrete subclass or by defining all the abstract method along with the new statement.
Does an abstract class need a subclass?
Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, then the subclass must also be declared abstract .
Can we write JUnit for abstract class?
With JUnit, you can write a test class for any source class in your Java project. When the abstract class has static units, which can then be invoked without instantiating any subclass. When the abstract class has some awareness of its subclasses and can manage conversions between them.
Can abstract class be mocked?
So there is NO way to mock an abstract class without using a real object implementation (e.g inner class definition in unit test class, overriding abstract methods) and spying the real object (which does proper field initialization).
How to unit test abstract classes in C #?
Moreover, if you test abstract classe’s implemented methods, then you are binding your test with the abstract class implementation – but you can’t create object of abstract class so what is the use of such test? 🙂 Thanks for contributing an answer to Stack Overflow!
When to use superclass inheritance in unit testing?
Create test superclass for your unit tests that exercises the base class methods. Whenever you’re testing a subclass of your base class, have your test class inherit from your test superclass. This approach ensures that you haven’t changed the behavior of the base class inadvertently, but limits the flexability of your test.
Which is the best way to test abstract classes?
I prefer second option (currently) and testing abstract classes using RhinoMocks PartialMock feature which allows me to create a mock of an abstract class. Just test the implementing classes.
Can a mock class extend an abstract class?
The mock class extends only the abstract methods of the Abstract class under test. Those methods can be no-op, return null, etc. as they will not be tested. The test class tests only the non-abstract public API (ie the Interface implemented by the Abstract class).