JS: move more test to box tests

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

@@ -0,0 +1,25 @@
+package foo
+
+interface A {
+    fun addFoo(s: String): String {
+        return s + "K"
+    }
+}
+
+interface B {
+    fun hooray(): String {
+        return "O"
+    }
+}
+
+interface AD : A, B {
+
+}
+
+class Test() : AD {
+    fun eval(): String {
+        return addFoo(hooray());
+    }
+}
+
+fun box() = Test().eval()