quarkus: Log Level configuration not working in Unit Tests

Describe the bug When running unit tests (not @QuarkusTest) of a quarkus project, only severe log messages are printed, no matter what quarkus.log.level is configured. This can be reproduced with the reproducer code below or any fresh Kotlin Gradle Quarkus project created with code.quarkus.io.

E.g. if I run the following test

import org.junit.jupiter.api.Test
import java.util.logging.Logger

class ExampleLoggingTest {

    private val logger = Logger.getLogger(ExampleLoggingTest::class.java.name)

    @Test
    fun testHelloEndpoint() {
        logger.severe { "Log severe" }
        logger.info { "Log info" }
        logger.fine { "Log fine" }
        logger.finest { "Log finest" }
    }
}

with an application.properties file like this:

quarkus.log.level=TRACE

Only the following log message is printed:

Log severe

When I remove the following from the build.gradle file

test {
    systemProperty "java.util.logging.manager", "org.jboss.logmanager.LogManager"
}

I then also get the INFO log and the format changes. The result is

Juli 31, 2020 9:13:29 AM org.acme.ExampleLoggingTest testHelloEndpoint
SEVERE: Log severe
Juli 31, 2020 9:13:29 AM org.acme.ExampleLoggingTest testHelloEndpoint
INFO: Log info

When running the same test as a @QuarkusTest, the logging works as expected. Still, unit tests are an important part of tests and function the same way.

Expected behavior All log messages with a level higher than the one specified in the application.properties file should be printed in unit tests.

Actual behavior Only severe messages are logged by default and only severe plus info messages are logged when removing the test {...} block from the build.gradle file.

To Reproduce Steps to reproduce the behavior:

1. Download reproducer project and unzip it (or add the test shown above to any plain Quarkus Kotlin Gradle project from code.quarkus.io) 2020-07-31_tests-logging.zip
2. Run ./gradlew check
3. Only the severe message is shown.

Configuration

quarkus.log.level=TRACE

Environment (please complete the following information):

• Windows 10
• Quarkus 1.6.1, 1.5.2, 1.4.1 (others not tested)
• Kotlin
• OpenJDK 11