android testing - Robolectric and View.getHeight() -


i'm trying test custom scrolling behavior changes location of view based on how far down user has scrolled. discovered though view scroll in robolectric 2.2, height of listview (and else) 0.

i read shadow objects , we're supposed call visible() when starting activity it'll drawn, , that's done. default layout listactivity listview match_parent height , width.

what's missing? why doesn't list have height? 

@test public void testlistactivity() {     final listactivity activity = robolectric.buildactivity(listactivity.class).create().start().resume().visible().get();      listview listview = activity.getlistview();      // set adapter items scroll.     final arraylist<string> messages = new arraylist<>();     final int numberofchildren = 100;     (int = 0; < numberofchildren; i++) {         messages.add("test");     }      final arrayadapter<string> listadapter = new arrayadapter<>(activity, android.r.layout.simple_dropdown_item_1line, messages);     listview.setadapter(listadapter);     assert.assertequals(listview.getcount(), numberofchildren);      assert.asserttrue(listview.getheight() > 0); // fails. }

call populateitems() on shadow of listview after setting adapter:

... listview.setadapter(listadapter);  shadowlistview shadowlistview = robolectric.shadowof(listview); shadowlistview.populateitems();  assert.asserttrue(listview.getheight() > 0); ...

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