HOWTO control logging running tests from Gradle

build-snippet.gradle

// IN the build.gradle file
test {
    systemProperties 'logback.configurationFile' : new File(projectDir,'src/test/resources/logback-test.xml').absolutePath
}

logback-test.xml

<!-- Place this file in src/test/resources -->
<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- control the level of output here -->
    <root level="info">
        <appender-ref ref="STDOUT" />
    </root>
</configuration>

It looks like it does not work in fresh versions of gradle https://discuss.gradle.org/t/logback-xml-versus-gradle-build/340