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taglib testing

From: user 1.
Sent on: Tuesday, February 26, 2008 3:35 PM
I was talking with Brad about how to test grail taglibs, and we didn't
come up with a solution. I figured it out now, and wanted to send it out
to you guys because it is so 'groovy'.

Consider that you've got a simple taglib:

class SomeTagLib {

   def doit = { attrs ->
     out << "foobar!"

the question was: how to do you test this? It seems difficult, because
you've got to somehow stick a StringWriter or something in the place of
'out', but where is 'out' defined? (I originally thought it was
'System.out', but it isn't)

Here is the solution I came up with:

class SomeTagLibTest {

   def testDoIt {
     def sw = new StringWriter();
     def pw = new PrintWriter(sw);

     SomeTagLib.metaClass­.getOut << { -> out }

     def tag = new SomeTagLib();

     assertEquals("foobar­!", sw.toString())


Understanding this has totally opened my eyes to how grails is doing a
lot of things behind the scenes.


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