How to unit test several different functions that take the same inp... (2024)

FAQs

Should unit tests test multiple functions? ›

For unit tests to be effective and manageable, each test should have only one test case. That is, the test should have only one assertion. It sometimes appears that to properly test a feature, you need several assertions. The unit test might check each of these assertions, and if all of them pass, the test will pass.

Unit tests should be repeatable and yield the same results each time they're run. If a test passes one time and fails another time without any changes in the code, it becomes impossible to rely on such tests.

Note that in order to test something, we use one of the assert* methods provided by the TestCase base class. If the test fails, an exception will be raised with an explanatory message, and unittest will identify the test case as a failure. Any other exceptions will be treated as errors.

Keep tests small and focused on making them easier to maintain and quickly identify the source of any issues. Write tests before code: Writing tests before writing code helps you to think about the desired functionality and to clarify requirements. This also makes it easier to write testable code.

Why not compare groups with multiple t-tests? Every time you conduct a t-test there is a chance that you will make a Type I error. This error is usually 5%. By running two t-tests on the same data you will have increased your chance of "making a mistake" to 10%.

There's nothing wrong with multiple assertions in a single test. The above example illustrates the benefits. A single test case can have multiple outcomes that should all be verified.

Points of integration to other systems should not be included in unit tests. For example… Testing points of integration to other sub systems is slow and we want to keep the speed of our unit tests fast.

Excessive Unit Tests often mean you're adding tests (more moving parts to your software) which really give you nothing but more lines of code. They do not improve the quality of the software but instead add bloat which is just more stuff to trawl through / manage / deal with in your day-to-day development.

Repeat test means laboratory procedures to verify only an abnormal result reported on the initial or second screen and performed on a specimen of blood.

Unit testing considerations What errors are commonly found during Unit Testing? (1) Misunderstood or incorrect arithmetic precedence, (2) Mixed mode operations, (3) Incorrect initialization, (4) Precision inaccuracy, (5) Incorrect symbolic representation of an expression.

What is the difference between unit tests and functional tests? ›

Unit testing focuses on testing individual elements of the application, such as functions, methods, or classes, in isolation. Functional testing is concerned with the external aspects of the application, while unit testing is concerned with the internal aspects.

Unit testing itself is rather easy once you understand how to do it. Even test driven or behavior driven development is easy one mastered… at least for the ideal scenario. What is the ideal scenario then? It is a unit test where the class under test has no external dependencies.

There isn't really a one-to-one relationship between classes/methods and unit tests/assertions. But in general, you should try to do something like this: Each unit test covers one case of one method, using a single set of inputs. It uses a single assertion.

As long as the experiment is repeated a sufficient number of times, it does not matter how many variables are used. Yes, an experiment should test only one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.

Unit tests should test one method only. This allows you to easily identify what failed if the test fails. Unit tests should not be coupled together, therefore one unit test CANNOT rely on another unit test having completed first.

I write at least one test per method, and somtimes more if the method requires some different setUp to test the good cases and the bad cases. But you should NEVER test more than one method in one unit test.