Java

Cucumber-JVM plugin to find unused steps

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Tim te Beek

Cucumber-JVM is a framework for writing end to end tests in natural language, with each line backed by a Java method. Each Java method has a regular expression of natural language lines to match, and lines should only match one such pattern. On a recent assignment I was tasked with modernizing a fairly large cucumber test suite, and going through the steps I found a lot of Java methods that were not being called from the natural language feature files anymore. To identify and remove these unused steps, and prevent any new unused steps in the future, I created the following plugin.

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TestContainers project can make your (integration) test life easier

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Tom de Vroomen

There are those moments you wish you could just start up a real database or system for your (integration) test. In many tests I’ve written I used H2 or HSQLDB to have a data storage for my tests. It starts up quickly and almost supports everything you need to do your repository test or any other test needing data storage. But when your project progresses you start using other ways to store your data other than standard SQL or you use dialect specifics to create your database. This is the moment you discover H2 or HSQLDB is not supporting your database vendor specific features and you can’t get your test running. For example the support for PostgreSQL in H2 or HSQLDB isn’t great, using TIMESTAMP in a SQL script already makes H2 or HSQLDB break. Yes, there are workarounds, but you rather not apply them to keep your code clean and simple. This is the moment you wish it is cheap to start up a real database instance you can test against, so you’re sure your code works in your production environment. You could install the database software locally, make some scripts to initialise the database and clean up afterwards. Or you can make scripts to do this in a Docker container. But what if there’s something which makes this even cheaper to setup?

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Get your application version with Spring Boot

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Ties van de Ven

There are a few ways to get your application version with Spring Boot. One approach is using Maven resource filtering to add the version number as an enviroment variable in the application.yml during the build. Another approach is to use the Implementation-Version stored in the manifest file.

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Spicy Spring: Create your own ResourceLoader

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Willem Cheizoo

As a Spring developer we know how to load a resource in a Service. The prefixes of classpath: and file: are commonly used. But what if we want to load resources from a different location like a database table RESOURCE, with our own prefix db:? The Spring Framework provides some default built-in resource implementations, which can be found in the chapter Resources in the Spring Framework Reference Guide. The URL is prefixed and handled by the corresponding ResourceLoader (JavaDoc). If we want to load a resource from a database table RESOURCE we have to create our own ResourceLoader which triggers on the prefix db:.

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Package-only dependencies in Maven

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Tom Wetjens

Sometimes you have a Maven project that needs dependencies for running tests that you do not want ending up in the final packaged WAR. We all know the test directive in the POM that accomplishes this. You might also have dependencies that are only required at runtime and need to be in the WAR but not on the compile classpath. Normally you would use the runtime directive in the POM. Consider a situation where we have a dependency that we want to be available at runtime (in the WAR), but not on the classpath during the execution of our tests. A nice example of this is logging implementations: we want to use the slf4j-simple implementation for running unit tests, but we want logback-classic to be packaged in the WAR. To accomplish this, you can use the maven-dependency-plugin as illustrated in the following POM snippet:

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