Open Close DrawerLayout

public final class DrawerLayoutTest  {

  @Test public void Open_Close_Drawer_Layout() {
    onView(withId(R.id.drawer_layout)).perform(actionOpenDrawer());
    onView(withId(R.id.drawer_layout)).perform(actionCloseDrawer());
  }

  public static ViewAction actionOpenDrawer() {
    return new ViewAction() {
      @Override public Matcher<View> getConstraints() {
        return isAssignableFrom(DrawerLayout.class);
      }

      @Override public String getDescription() {
        return "open drawer";
      }

      @Override public void perform(UiController uiController, View view) {
        ((DrawerLayout) view).openDrawer(GravityCompat.START);
      }
    };
  }

  public static ViewAction actionCloseDrawer() {
    return new ViewAction() {
      @Override public Matcher<View> getConstraints() {
        return isAssignableFrom(DrawerLayout.class);
      }

      @Override public String getDescription() {
        return "close drawer";
      }

      @Override public void perform(UiController uiController, View view) {
        ((DrawerLayout) view).closeDrawer(GravityCompat.START);
      }
    };
  }
  
}