JS: move more test to box tests

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

@@ -0,0 +1,21 @@
+// Test for KT-5673
+
+package foo
+
+interface Holder {
+    var element: String
+}
+
+class BasicHolder : Holder {
+    override var element: String = "not ok"
+
+    init {
+        element = "ok"
+    }
+}
+
+fun box(): String {
+    assertEquals("ok", BasicHolder().element)
+
+    return "OK"
+}