JS: move more test to box tests

js/js.translator/testData/box/native/class.kt

@@ -0,0 +1,25 @@
+package foo
+
+@native
+class A(b: Int) {
+    fun g(): Int = noImpl
+    fun m(): Int = noImpl
+}
+
+
+fun box(): String {
+    if (A(2).g() != 4) {
+        return "fail1"
+    }
+    if (A(3).m() != 2) {
+        return "fail2"
+    }
+    val a = A(100)
+    if (a.g() != 200) {
+        return "fail3"
+    }
+    if (a.m() != 99) {
+        return "fail4"
+    }
+    return "OK"
+}