existsAtMostOnce method

WidgetMatcher<W> existsAtMostOnce()

Asserts that at most one widget of type W exists.

This matcher is useful for scenarios where either one or no widget of type W should be present.

Example usage:

spot<ElevatedButton>().existsAtMostOnce();

See also:

• doesNotExist asserts that no widgets of type W exist.
• existsOnce asserts that exactly one widget of type W exists.
• existsExactlyNTimes asserts that exactly n widgets of type W exist.
• existsAtLeastOnce asserts that at least one widget of type W exists.
• existsAtLeastNTimes asserts that at least n widgets of type W exist.
• existsAtMostNTimes asserts that at most n widgets of type W exist.

Implementation

WidgetMatcher<W> existsAtMostOnce() {
  final atMostOne = copyWith(quantityConstraint: QuantityConstraint.single);
  return snapshot(atMostOne).single;
}