# Interface goog.labs.testing.Matcher

code »

A matcher object to be used in assertThat statements.

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## Instance Methods

code »describe ( value, opt_description ) ⇒ `string`

Describes why the matcher failed.

Parameters
value: `*` The value that didn't match. opt_description: `string=` A partial description to which the reason will be appended.
Returns
Description of why the matcher failed.

code »matches ( value ) ⇒ `boolean`

Determines whether a value matches the constraints of the match.

Parameters
value: `*` The object to match.
Returns
Whether the input value matches this matcher.

## Global Functions

code »goog.labs.testing.Matcher.makeMatcher ( matchesFunction, opt_describeFunction ) ⇒ `!Function`

Generates a Matcher from the ‘matches’ and ‘describe’ functions passed in.

Parameters
matchesFunction: `!Function` The ‘matches’ function. opt_describeFunction: `Function=` The ‘describe’ function.
Returns
The custom matcher.