How to Write "good Unit Tests?

How to write "good” unit tests?

How to Write

for TDD, "good" tests test features that the customer wants; features do not necessarily correspond to functions, and test scenarios should not be created by the developer in a vacuumin your case - i am guessing - the 'feature' is that the fit function models the input data within a certain error tolerance. Since I have no idea what you are really doing, I am making something up; hopefully it is analgous.Example story:So you go talk to the pilots (and to the targeting computer, if sentient). First you talk about what is 'normal', then talk about the abnormal. You find out what really matters in this scenario, what is common, what is unlikely, and what is merely possible.Let's say that normally you will have a half-second window over seven channels of telemetry data: speed, pitch, roll, yaw, target vector, target size, and target velocity, and that these values will be constant or changing linearly. Abnormally you may have less channels and/or the values may be changing rapidly. So together you come up with some tests such as:Now, you may have noticed that there's no scenario for the particular situation described in the story. It turns out, after after talking with the customer and other stakeholders, that goal in the original story was just a hypothetical example. The real tests came out of the ensuing discussion. This can happen. The story should be rewritten, but it does not have to be [since the story is just a placeholder for a conversation with the customer]

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Should I have unit tests for known defects?

I think you should have an unit test with the current behaviour and in the comments, add the right test and right behaviour. Example:This way, when the fix is available, the build will fail, noticing you the failed test. When you will look at the test, you will know that you changed the behaviour and the test must be updated.EDIT: As Captain Man said, in large projects, this will not get fixed anytime soon but for the documentation sake, the original answer is better than nothing.A better way to do it is duplicating the current test, e.g. The same way you would be doing with introducing or changing the test to reflect the bug, except you do not fail the build if this is critical for your team, like OP said that the bugfix wo not be included in the current release.

How to Write

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How to handle "fake” unit tests that don't really test anything?

I believe that the strongest instrument for filtering such a-low-quality tests is a code review. You can power-up your code review with mutational testing techniques which will help you to detect the tests which probably do not introduce any value to the overall project scope.Here is the example of mutational testing framework where you can pick some concepts and probably look for alternatives for your programming language.

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Automating checks for "good” unit tests

Your characteristics of unit tests are missing some of important features in my opinion:The main point of a good test is that it fails when something is wrong and not when nothing is wrong and lets you find out what was wrong so look for:

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Should I spend time prettifying unit tests? [closed]

The reason why you create pretty code is because it makes the code easier to maintain at a later stage. To make this possible, the unit-tests need to be maintainable. To do that, he needs to look at your tests and find out what they are actually testing. So yes, you should aim for a high quailtiy standard when writing unit-testing code

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How to use unit tests when using BDD?

Disclaimer: I am not an expert in BDD, but I try to give you my point of view on the article you linked to.TDD is an implementation technique - you first write a test, then you implement the method, run your test, refactor, and add further tests for the same method or for a new method. TDD does actually not define any rules for how to choose class or method names, that's up to you. TDD also does not tell you "when you are done".So whenever you write a test for a new method, you have to choose a method name - and that is the point where BDD comes in. By choosing method names using the business terms from the scenario above, and by choosing them in a way describing the behaviour of your class, you are doing BDD. Whenever you ask yourself "do I have to add further tests", you can look the the scenarios given by your BA and check if you have implemented all the needed parts them completely. If not, you will need to add more tests.The author of the article also suggest to use a more behaviour-related naming scheme when choosing the names of your tests, that's why he suggests to replace JUnit by a tool which does not rely on a naming scheme where each test case has to start with the name "test". Though I do not know JBehave, I think that's the main difference between that tool and Junit. Moreover, the BDD scenarios will also be a blueprint for integration tests - which you will typically add after you have fleshed out the method names by TDD and after you added a reasonable amount of unit tests.So, to my understanding, TDD is an instrument you can use as part of BDD, and BDD helps you to write the right tests and give them better names

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