JS: move more test to box tests

js/js.translator/testData/box/propertyOverride/initOverrideInConstructorComplex.kt

@@ -0,0 +1,30 @@
+// Test for KT-5673
+
+package foo
+
+interface Holder {
+    val element: String
+}
+
+open class BasicHolder : Holder {
+    override val element: String
+        get() = field + field
+
+    init {
+        element = "1"
+    }
+}
+
+class AdvancedHolder : BasicHolder() {
+    override val element: String
+
+    init {
+        element = super.element + super.element
+    }
+}
+
+fun box(): String {
+    assertEquals("1111", AdvancedHolder().element)
+
+    return "OK"
+}