JS: move expressions test to box tests

js/js.translator/testData/box/expression/function/KT-921.kt

@@ -0,0 +1,87 @@
+import java.util.*
+
+var log = ""
+
+private fun printLog(message: String) {
+    log += message
+}
+
+private fun printlnLog(message: String) = printLog("$message\n")
+
+class Lifetime() {
+    val attached = ArrayList<Function0<Unit>>()
+
+    public fun attach(action: () -> Unit) {
+        attached.add(action)
+    }
+
+    fun close() {
+        for (x in attached) x()
+        attached.clear()
+    }
+}
+
+public class Viewable<T>() {
+    val items = ArrayList<T>()
+
+    fun add(item: T) {
+        items.add(item)
+    }
+
+    fun remove(item: T) {
+        items.remove(item)
+    }
+
+    fun view(lifetime: Lifetime, viewer: (itemLifetime: Lifetime, item: T) -> Unit) {
+        for (item in items) {
+            viewer(lifetime, item)
+        }
+    }
+}
+
+fun lifetime(body: (Lifetime) -> Unit) {
+    val l = Lifetime()
+    body(l)
+    l.close()
+}
+
+fun<T> Dump(items: ArrayList<T>) {
+    for (item in items) {
+        printLog(item.toString() + ", ")
+    }
+    printlnLog("end")
+}
+
+fun box(): String {
+    val v = Viewable<Int>()
+    val x = ArrayList<Int>()
+    v.add(1)
+    v.add(2)
+    v.add(3)
+    lifetime() {
+        v.view(it) { itemLifetime, item ->
+            x.add(item)
+            Dump(x)
+            itemLifetime.attach() {
+                x.remove(item as Any);
+                Dump(x);
+                printlnLog("!")
+            }
+        }
+    }
+
+    val expected =
+            "1, end\n" +
+            "1, 2, end\n" +
+            "1, 2, 3, end\n" +
+            "2, 3, end\n" +
+            "!\n" +
+            "3, end\n" +
+            "!\n" +
+            "end\n" +
+            "!\n"
+
+    if (log != expected) return "fail: $log"
+
+    return "OK"
+}