@TempDir not working when on a field on @QuarkusTest

[xtaixe]

Describe the bug
Temp dir not being created and set when using @TempDir a field on @QuarkusTest. It works fine as a set up or test method parameter though.

Expected behavior
Temp dir is created and set on field.

Actual behavior
The field annotated with @TempDir is null

To Reproduce

@QuarkusTest
class MyTest {

    @TempDir
    Path tempDir;

    @Test
    public void defaultConfiguration() {
        System.out.println(tempDir); //Prints null
    }

}

Environment (please complete the following information):

• Output of uname -a or ver: Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64 x86_6
• Output of java -version:

openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment GraalVM CE 20.2.0 (build 11.0.8+10-jvmci-20.2-b03)
OpenJDK 64-Bit Server VM GraalVM CE 20.2.0 (build 11.0.8+10-jvmci-20.2-b03, mixed mode, sharing)

• Quarkus version or git rev:1.8.1.Final (quickly tested with 1.9.2.Final and got the same result)
• Build tool (ie. output of mvnw --version or gradlew --version): Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)

[famod]

/cc @geoand Is this a known limitation? I couldn't find anything in the docs or previous issues.

[geoand]

It's not a known limitation, but I guess it is to be expected.
Basically anything that gets injected into fields of the test outside of Quarkus' control, will not work - as QuarkusTest creates a different test object (because it needs to be handled on a different ClassLoader).

In this case, we can most likely add support for @TempDir in QuarkusTest.
Otherwise we can just tell people in the docs to use the method parameter variant.

[Manfred73]

Running into this issue as well with a @QuarkusIntegrationTest. My application uses a configuration property with a directory location where it should look for files or write files to.

For my integration test I override this property with a different folder. I'd like to use the @TempDir annotation as an instance variable for this, but reading this, that won't work. I can't use the method parameter variant though since I need to override the getConfigOverrides method from the QuarkusTestProfile.

Having the ability to use something like @QuarkusTempDir would solve this I guess.

[malaskowski]

I know this is not perfect, but here's a workaround (I tested it with 2.16.0.Final version):

@QuarkusTest
@TestProfile(Configuration.class)
class MyTest {

  @TempDir
  static Path sharedTempDir;

  public static class Configuration implements QuarkusTestProfile {
    @Override
    public Map<String, String> getConfigOverrides() {
      return Map.of("temp.directory", sharedTempDir.toString());
    }
  }

  @ConfigProperty(name = "temp.directory")
  String tempDirectory;

  @Test
  public void defaultConfiguration() {
      System.out.println(tempDirectory); //Prints actual value
  }
}

[morhei]

Ran into the same issue today.
Guess I'll have to try the workaround.

Edit: can't use that since we use another TestProfile already :/

[leninmehedy]

Ran into the same issue

[geoand]

This should be fixed when the very important and complicated work @holly-cummins is doing lands