hasElementProp<T> method

WidgetMatcher<W> hasElementProp<T>({ required NamedElementProp<T?> prop, required MatchProp<T> match, })

Asserts that an element's property meets a specific condition.

This method is useful for making assertions on properties within the element of the widget.

Example usage:

spot<Checkbox>().existsOnce().hasElementProp(
  prop: elementProp('value', (e) => (e.widget as Checkbox).value),
  match: (it) => it.equals(true),
);

Implementation

WidgetMatcher<W> hasElementProp<T>({
  required NamedElementProp<T?> prop,
  required MatchProp<T> match,
}) {
  void condition(Subject<Element> subject) {
    final Subject<T> value = subject.context.nest<T?>(
      () => ['Element of $W', "with prop '${prop.name}'"],
      (element) {
        final value = getElementProp(prop);
        return Extracted.value(value);
      },
    ).hideNullability();

    match(value);
  }

  final failure = softCheckHideNull(element, condition);
  failure.throwPropertyCheckFailure(condition, element);
  return this;
}