### Question:
DynamicFormBuilder extends CanvasBuilder<DynamicForm, DynamicFormBuilder> { public DynamicFormBuilder setNumCols(int numCols) { instance().setNumCols(numCols); return me(); } DynamicFormBuilder(DynamicForm instance); static DynamicFormBuilder buildDynamicForm(); DynamicFormBuilder setNumCols(int numCols); DynamicFormBuilder setAutoFocus(Boolean autoFocus); DynamicFormBuilder setFields(FormItem... fields);  }### Answer:
@Test public void test_setsNumCols() { dynamicFormBuilder.setNumCols(2); verify(dynamicForm).setNumCols(2); }
@Test public void test_returnsBuilderWhenSettingNumCols() { assertEquals(dynamicFormBuilder, dynamicFormBuilder.setNumCols(2)); }