TypeMatcher<T> class Null safety

A Matcher subclass that supports validating the Type of the target object.

expect(shouldBeDuration, TypeMatcher<Duration>());

If you want to further validate attributes of the specified Type, use the having function.

void shouldThrowRangeError(int value) {
  throw RangeError.range(value, 10, 20);
}

expect(
    () => shouldThrowRangeError(5),
    throwsA(const TypeMatcher<RangeError>()
        .having((e) => e.start, 'start', greaterThanOrEqualTo(10))
        .having((e) => e.end, 'end', lessThanOrEqualTo(20))));

Notice that you can chain multiple calls to having to verify multiple aspects of an object.

Note: All of the top-level isType matchers exposed by this package are instances of TypeMatcher, so you can use the having function without creating your own instance.

expect(
    () => shouldThrowRangeError(5),
    throwsA(isRangeError
        .having((e) => e.start, 'start', greaterThanOrEqualTo(10))
        .having((e) => e.end, 'end', lessThanOrEqualTo(20))));
Inheritance
Implementers

Constructors

TypeMatcher([@Deprecated('Provide a type argument to TypeMatcher and omit the name. ' 'This argument will be removed in the next release.') String? name])
Create a matcher matches instances of type T.
const

Properties

hashCode → int
The hash code for this object.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

describe(Description description) → Description
Builds a textual description of the matcher.
override
describeMismatch(dynamic item, Description mismatchDescription, Map matchState, bool verbose) → Description
Builds a textual description of a specific mismatch.
override
having(Object? feature(T), String description, dynamic matcher) → TypeMatcher<T>
Returns a new TypeMatcher that validates the existing type as well as a specific feature of the object with the provided matcher.
matches(Object? item, Map matchState) → bool
Does the matching of the actual vs expected values.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited