[Native][tests] Special logger to pass messages directly to Gradle console

native/native.tests/testResources/native-tests-logging.properties

@@ -0,0 +1,6 @@
+handlers=java.util.logging.ConsoleHandler
+
+java.util.logging.ConsoleHandler.level=INFO
+java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
+
+java.util.logging.SimpleFormatter.format=%5$s%n

native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/support/util/TestLogger.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.konan.blackboxtest.support.util
+
+import java.util.logging.LogManager
+import java.util.logging.Logger
+
+/**
+ * Helps to log textual messages directly from JUnit test process to Gradle console.
+ *
+ * Note: Need to call [initialize] before the first [log] call.
+ */
+internal object TestLogger {
+    private const val CONFIG_FILE = "/native-tests-logging.properties"
+
+    private val mutex = Any()
+    private var wrappedLogger: Logger? = null
+
+    fun initialize() {
+        synchronized(mutex) {
+            check(wrappedLogger == null) { "An attempt to re-initialize ${TestLogger::class.java}" }
+
+            val logManager: LogManager = LogManager.getLogManager()
+            TestLogger::class.java.getResourceAsStream(CONFIG_FILE)?.let(logManager::readConfiguration)
+                ?: error("Test configuration file $CONFIG_FILE not found at the classpath")
+
+            wrappedLogger = Logger.getLogger(TestLogger::class.java.name)
+        }
+    }
+
+    fun log(message: String) {
+        wrappedLogger?.info(message) ?: error("${TestLogger::class.java} has not been initialized")
+    }
+}