Refactor: extract JVM-specific tests into separate files

Make KotlinVersion random comparison test running in JS

libraries/stdlib/test/collections/MutableCollectionsJVMTest.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+@file:JvmVersion
+package test.collections
+
+import kotlin.test.*
+
+
+class MutableCollectionJVMTest {
+
+    @Test fun shuffledRnd() {
+        val rnd1 = java.util.Random(42L)
+        val rnd2 = java.util.Random(42L)
+
+        val list = MutableList(100) { it }
+        val shuffled1 = list.shuffled(rnd1)
+        val shuffled2 = list.shuffled(rnd2)
+
+
+        assertNotEquals(list, shuffled1)
+        assertEquals(list.toSet(), shuffled1.toSet())
+        assertEquals(list.size, shuffled1.distinct().size)
+
+        assertEquals(shuffled1, shuffled2)
+    }
+}

libraries/stdlib/test/collections/MutableCollectionsTest.kt

@@ -109,20 +109,4 @@ class MutableCollectionTest {
         assertEquals(list.size, shuffled.distinct().size)
     }
 
-    @JvmVersion
-    @Test fun shuffledRnd() {
-        val rnd1 = java.util.Random(42L)
-        val rnd2 = java.util.Random(42L)
-
-        val list = MutableList(100) { it }
-        val shuffled1 = list.shuffled(rnd1)
-        val shuffled2 = list.shuffled(rnd2)
-
-
-        assertNotEquals(list, shuffled1)
-        assertEquals(list.toSet(), shuffled1.toSet())
-        assertEquals(list.size, shuffled1.distinct().size)
-
-        assertEquals(shuffled1, shuffled2)
-    }
 }