How Many Unit Tests Should I Write for Subclass Arguments?

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Asked By CodingEnthusiast42 On

I'm working on a project where I have a method declared as `public boolean checkVehicle(Vehicle vehicle)`. I call this method multiple times with different subclasses of `Vehicle`, like `checkVehicle(car)` for a `Car` object and `checkVehicle(truck)` for a `Truck` object. Since both `Car` and `Truck` extend from `Vehicle`, I'm wondering if I should just create one unit test using a `Vehicle` object, or do I need separate tests for `Car` and `Truck`? I'd appreciate any insights on the best practices for unit testing in this scenario.

3 Answers

Answered By UnitTestHero On

If you’re using Java or C#, you can actually parameterize your tests. Check out how to implement 'parameterized tests' in those languages. This would allow you to test both `Car` and `Truck` without duplicating too much code. That said, if specific behaviours for each subclass aren’t needed, then testing just `Vehicle` might suffice.

Answered By CodeMaster101 On

Consider these questions: Do your tests cover all code paths? Have you tested for reasonable error paths and extremes? For instance, if you're passing strings, are you checking for empty or whitespace strings? If your method takes integers, are you testing beyond the allowed range? Think about these when deciding the number of tests; you might find that one thorough test is enough.

Answered By TestGuru88 On

If one test covers all the behaviours you need, then you're good with just one. But if your method behaves differently based on whether the vehicle is a truck or a car, having separate tests is essential.

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