Peter Hicks' Blog

Category: Java

  • Integration and Unit Tests with IntelliJ IDEA and JUnit 5

    When working on a project in Java, I like to name my integration and unit tests separately. Integration tests end ‘-IT’, and unit tests don’t.

    This makes it really easy to run just unit or integration tests in IntelliJ by using one of these two patterns:

    • Integration tests – ^(.*IT.*).*$
    • Unit tests – ^(?!.*IT.*).*$

    Make sure the Run configuration has the Test Kind set to Pattern, and searches for tests in the whole project.

  • Converting from assert() to assertEquals() in Java

    When I was inexperienced in Java, I wrote a lot of tests using assert(), rather than using assertEquals().
    Revisiting code today, I wanted to update many test suites to use assertEquals(), which requires I flip the expected and actual values around. Too difficult to do quickly by hand, so I used the following regular expression:
    Find: assert \((.+)\)\.equals\((.+)\)\);
    Replace: assertEquals($2, $1));
    It worked like a treat.