stdlib tests: move JVM-only test source files

libraries/stdlib/jvm/test/concurrent/ThreadTest.kt

@@ -0,0 +1,51 @@
+@file:kotlin.jvm.JvmVersion
+package test.concurrent
+
+import kotlin.concurrent.*
+import kotlin.test.*
+
+
+import java.util.concurrent.*
+import java.util.concurrent.TimeUnit.*
+
+class ThreadTest {
+    @Test fun scheduledTask() {
+
+        val pool = Executors.newFixedThreadPool(1)
+        val countDown = CountDownLatch(1)
+        pool.execute {
+            countDown.countDown()
+        }
+        assertTrue(countDown.await(2, SECONDS), "Count down is executed")
+    }
+
+    @Test fun callableInvoke() {
+
+        val pool = Executors.newFixedThreadPool(1)
+        val future = pool.submit<String> {  // type specification required here to choose overload for callable, see KT-7882
+           "Hello"
+        }
+        assertEquals("Hello", future.get(2, SECONDS))
+    }
+
+    @Test fun threadLocalGetOrSet() {
+        val v = ThreadLocal<String>()
+
+        assertEquals("v1", v.getOrSet { "v1" })
+        assertEquals("v1", v.get())
+        assertEquals("v1", v.getOrSet { "v2" })
+
+        v.set(null)
+        assertEquals("v2", v.getOrSet { "v2" })
+
+        v.set("v3")
+        assertEquals("v3", v.getOrSet { "v2" })
+
+
+        val w = object: ThreadLocal<String>() {
+            override fun initialValue() = "default"
+        }
+
+        assertEquals("default", w.getOrSet { "v1" })
+    }
+}