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Why tag lib test throws GrailsTagException?

class MyTagLib {

 

  def something = {attrs, body ->

    def format = new FormatTagLib()

    out << format.formatDate(attrs.date, format: 'HH:mm')

  }

 

}

       

class MyTagLibTests extends TagLibUnitTestCase {

 

  //setUp() and tearDown() ommited

 

  void testMyTagLib() {

    tagLib = new MyTagLib()

    tagLib.something(date: Date.parse('20/04/2012 08:00','dd/MM/yyyy HH:mm'))

    assertEquals('08:00', out.toString()) //out is mocked...

  }

 

}

       

org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Tag [formatDate] does not exist. No corresponding tag library found.