argThat function Null safety

Null argThat(
  1. Matcher matcher,
  2. {String? named}
)

An argument matcher that matches an argument (named or positional) that matches matcher. When capturing a named argument, the name of the argument must be passed via named.

See the README section on argument matchers for examples.

Implementation

/// When capturing a named argument, the name of the argument must be passed via
/// [named].
///
/// See the README section on
/// [argument matchers](https://pub.dev/packages/mockito#argument-matchers)
/// for examples.
Null argThat(Matcher matcher, {String? named}) =>
    _registerMatcher(matcher, false, named: named, argumentMatcher: 'argThat');