Question 1

compile-testing vs JUnit for annotation processor testing?

Accepted Answer

Compile-testing is specialized for compilation scenarios, allowing direct compiler interaction and diagnostics assertion, whereas JUnit focuses on runtime testing. For annotation processors, compile-testing is essential to verify generated code and compiler messages that JUnit can't handle.

Question 2

how to set up compile-testing in a Maven project?

Accepted Answer

Add the dependency from Maven Central using the coordinates com.google.testing.compile:compile-testing. Then, in your test classes, import the library APIs to compile Java source strings and assert on results, as referenced in the Maven badge and links.

Question 3

what are common use cases for compile-testing?

Accepted Answer

Common uses include testing custom annotation processors for correct code generation, verifying compiler error messages in tutorials, and ensuring backward compatibility across Java versions, as listed in the best-for scenarios.

Question 4

compile-testing example for a simple annotation processor?

Accepted Answer

Define source code with your annotation in a test, use CompilationSubject to compile it, and assert success or failure with specific diagnostics. Check the Javadoc for detailed examples, as the README points to it for usage.

Question 5

does compile-testing work with Java modules?

Accepted Answer

Compile-testing may have limitations with Java module system testing, as it primarily focuses on classpath-based compilation. You might need to explore the library's documentation or community discussions for module-specific support.

Question 6

how to handle dependencies in compile-testing tests?

Accepted Answer

Since it involves real compilation, manage dependencies by providing stub implementations or controlling the classpath in tests. This can add complexity compared to mocking in standard unit tests.

compile-testing

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