# Yahoo! UI Library

### yuitest 2.8.2r1

Yahoo! UI Library > yuitest > YAHOO.util.UnexpectedError
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## Class YAHOO.util.UnexpectedError - extends YAHOO.util.AssertionError

UnexpectedError is subclass of AssertionError that is thrown whenever an error occurs within the course of a test and the test was not expected to throw an error.

### Constructor

YAHOO.util.UnexpectedError `( cause )`

Parameters:
  `cause <Error>` The unexpected error that caused this error to be thrown.

### Properties

#### cause - `Error`

The unexpected error that occurred.

#### name - `String`

The name of the error that occurred.

#### stack - `String`

Stack information for the error (if provided).

#### Properties inherited from YAHOO.util.AssertionError:

`name`

#### Methods inherited from YAHOO.util.AssertionError:

`getMessage, toString`

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