JS: move more test to box tests

js/js.translator/testData/box/trait/checkImplementationCharacteristics.kt

@@ -0,0 +1,34 @@
+package foo
+
+public interface A {
+    fun foo() {
+    }
+}
+public interface B : A {
+    fun boo() {
+    }
+}
+
+@native class Function(vararg args: String)
+
+val hasProp = Function("obj, prop", "return obj[prop] !== undefined") as ((Any, String) -> Boolean)
+
+fun box(): String {
+    val a = object: A {
+    }
+    val b = object: B {
+    }
+
+    if (!hasProp(a, "foo")) return "A hasn't foo"
+    if (hasProp(a, "boo")) return "A has boo"
+
+    if (!hasProp(b, "foo")) return "B hasn't foo"
+    if (!hasProp(b, "boo")) return "B hasn't boo"
+
+    val PREFIX = "kotlin.modules.JS_TESTS.foo"
+    if (eval("$PREFIX.A") == null) return "$PREFIX.A not found"
+    if (eval("$PREFIX.B") == null) return "$PREFIX.B not found"
+    if (eval("$PREFIX.A === $PREFIX.B") as Boolean) return "A and B refer to the same object"
+
+    return "OK"
+}