New stdlib tests

- Unzip from the same test-data archive
- Add actual declarations

backend.native/tests/build.gradle

@@ -123,7 +123,7 @@ task update_external_tests() {
 //                from(zipTree(it)) {
             from(zipTree(file('/Users/ppunegov/ws/kotlin/dist/kotlin-test-data.zip'))) {
 
-                include 'compiler/**'
+                include('compiler/**', 'stdlib/**')
                 }
             into(temporaryDir)
         }
@@ -141,6 +141,16 @@ task update_external_tests() {
             include 'compileKotlinAgainstKotlin/**'
         }
 
+        externalStdlibTestsDir.mkdirs()
+        delete("${externalStdlibTestsDir.canonicalPath}/common")
+        delete("${externalStdlibTestsDir.canonicalPath}/test")
+        copy {
+            from temporaryDir.absolutePath + "/stdlib"
+            into(externalStdlibTestsDir)
+            include 'common/**'
+            include 'test/**'
+        }
+
         //clean tmp dir.
         delete temporaryDir
     }
@@ -2930,7 +2940,9 @@ task runKonanRegexTests(type: RunKonanTest) {
 
 task buildKonanStdlibTests(type: BuildKonanTest) {
     outputSourceSetName = "testOutputStdlib"
-    compileList = [ "stdlib_external", "testUtils.kt" ]
+    flags = [ "-Xmulti-platform" ]
+    compileList = [ "stdlib_external/test", "stdlib_external/common",
+                    "stdlib_external/utils.kt", "stdlib_external/jsCollectionFactoriesActuals.kt" ]
 }
 
 task runStdlibTests(type: RunStdlibTest) {

backend.native/tests/stdlib_external/jsCollectionFactoriesActuals.kt

@@ -0,0 +1,11 @@
+/*
+ * 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.
+ */
+
+package test.collections.js
+
+actual fun <V> stringMapOf(vararg pairs: Pair<String, V>): HashMap<String, V> = hashMapOf<String, V>(*pairs)
+actual fun <V> linkedStringMapOf(vararg pairs: Pair<String, V>): LinkedHashMap<String, V> = linkedMapOf(*pairs)
+actual fun stringSetOf(vararg elements: String): HashSet<String> = hashSetOf(*elements)
+actual fun linkedStringSetOf(vararg elements: String): LinkedHashSet<String> = linkedSetOf(*elements)

backend.native/tests/stdlib_external/utils.kt

@@ -0,0 +1,15 @@
+package test
+
+import kotlin.test.*
+
+public actual fun assertTypeEquals(expected: Any?, actual: Any?) {
+    if (expected != null && actual != null) {
+        assertEquals(expected::class, actual::class)
+    } else {
+        assertTrue(expected == null && actual == null)
+    }
+}
+
+public actual fun randomInt(limit: Int): Int = kotlin.random.Random.nextInt(limit)
+
+internal actual fun String.removeLeadingPlusOnJava6(): String = this