Set java.class.path property in runner and loader

#KT-24991 fixed

compiler/testData/launcher/contextClassLoaderTester.kt

@@ -1,11 +1,19 @@
 
+import java.io.File
+
 object ContextClassLoaderTester {
 
     @JvmStatic
     fun main(args: Array<String>) {
         kotlin.test.DefaultAsserter.assertTrue("", true) // this tests that kotlin-test is in the compilation and runtime classpaths
+
         val contextClassLoader = Thread.currentThread().getContextClassLoader()
         contextClassLoader.loadClass("kotlin.test.DefaultAsserter") // this tests that thread context classloader is set correctly
-        println("ok")
+
+        val classPathFromProp = System.getProperty("java.class.path")
+
+        val jarFromProps = classPathFromProp.split(File.pathSeparator).firstOrNull { it.contains("kotlin-test") }
+
+        println(jarFromProps?.let { File(it).name } ?: "kotlin-test.jar not found in the java.class.path property: $classPathFromProp")
     }
 }