JUnit 5 Temporary Directory Support

By | October 4, 2020

The built-in TempDirectory extension is mainly used to create and cleanup a temporary directory for an individual test or all tests in a test class.

To use it, We have to annotate a non-private field of type java.io.File Or java.nio.file.Path with @TempDir or add a parameter of type  java.io.File Or java.nio.file.Path annotated with @TempDir to a lifecycle method or test method.

For example, the following test declares a parameter annotated with @TempDir for a single test method, creates and writes to a file in the temporary directory, and checks its content.

Key Points:

@TempDir is not supported on constructor parameters. If you wish to retain a single reference to a temp directory across lifecycle methods and the current test method, please use field injection, by annotating a non-private instance field with @TempDir.

Let’s try to understand the above concept using a demo project

pom.xml

 

SharedTempDirectoryTest.java

The output of the above project:

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That’s all about JUnit 5 Temporary Directory Support
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