lib/assert.js
function( name, value, match ) {
		var self = this,
			result = munit.isError( value ) ?
				self._errorMatch( value, match ) :
				{ passed: false, extra: "Value is not an Error '" + value + "'" };

		return self.ok( name, result.passed, self.isError, result.extra );
	}
function( name, value, match ) {
		var self = this,
			result = munit.isError( value ) ?
				self._errorMatch( value, match ) :
				{ passed: false, extra: "Value is not an Error '" + value + "'" };

		return self.ok( name, result.passed, self.isError, result.extra );
	}
function ( name , value , match ) { var self = this , result = munit . isError ( value ) ? self . _errorMatch ( value , match ) : { passed : false , extra : "Value is not an Error '" + value + "'" } ; return self . ok ( name , result . passed , self . isError , result . extra ) ; }
Testing value for Error object
Testing value for Error object