### Question:
HeaderMixin implements Mixin { public TextView getTextView() { return (TextView) templateLayout.findManagedViewById(R.id.suw_layout_title); } HeaderMixin(
      @NonNull TemplateLayout layout, @Nullable AttributeSet attrs, @AttrRes int defStyleAttr); TextView getTextView(); void setText(int title); void setText(CharSequence title); CharSequence getText();  }### Answer:
@Test public void testGetTextView() { HeaderMixin mixin = new HeaderMixin(mTemplateLayout, null, 0); assertSame(mHeaderTextView, mixin.getTextView()); }