JS: move expressions test to box tests

js/js.translator/testData/box/expression/misc/extensionLiteralCalledInsideExtensionFunction.kt

@@ -0,0 +1,20 @@
+package foo
+
+fun A.create(init: A.() -> Unit): A {
+    init()
+    return this
+}
+
+fun box(): String {
+    val a = A().create {
+        c = 1 + t
+    }
+    if (a.c != 4) return "fail: ${a.c}"
+
+    return "OK"
+}
+
+class A() {
+    val t = 3
+    var c = 2
+}