expect Matchers must implement/extend the Matcher class. The base Matcher class has a generic implementation of describeMismatch so this does not need to be provided unless a more clear description is required. The other two methods (matches and describe) must always be provided as they are highly matcher-specific.

Implemented by

Constructors

Matcher()

const

Properties

hashCode → int

Get a hash code for this object.

read-only, inherited
runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited

Operators

operator ==(other) → bool

The equality operator.

inherited

Methods

describe(Description description) → Description

This builds a textual description of the matcher.

describeMismatch(item, Description mismatchDescription, Map matchState, bool verbose) → Description

This builds a textual description of a specific mismatch. item is the value that was tested by matches; matchState is the Map that was passed to and supplemented by matches with additional information about the mismatch, and mismatchDescription is the Description that is being built to decribe the mismatch. A few matchers make use of the verbose flag to provide detailed information that is not typically included but can be of help in diagnosing failures, such as stack traces.

matches(item, Map matchState) → bool

This does the matching of the actual vs expected values. item is the actual value. matchState can be supplied and may be used to add details about the mismatch that are too costly to determine in describeMismatch.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited
toString() → String

Returns a string representation of this object.

inherited