The second part of our article on assertions and assumptions in JUnit 5. This time we are looking at assumptions.
2. Assumptions in JUnit 5
JUnit Jupiter comes with a subset of the assumption methods that JUnit 4 provides. JUnit Jupiter also adds a few assumption methods that lend themselves well to being used with Java 8 lambdas. All JUnit Jupiter assumptions are static methods in the org.junit.jupiter.api.Assumptions class
. The message parameter is on the last position.
The assertions are executed only in case that the assumption is fulfilled.
The method looks like this:
A comparison between assertions in JUnit 4 and JUnit 5 looks like this:
This is how the usage of the assume methods may look like:
JUnit 5 comes with a new and flexible API for assertions and assumptions. I provides a lot of static methods and adapted to the capabilities of the functional programming introduces with Java 8. The reader should have a good image of the new features and, from here, new steps can be made in the search of what JUnit 5 can provide. From what this article does not analyze, dynamic and parameterized tests may be the next logical areas to investigate.
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