Grails, simple controller unit test example.

HomeController.groovy

package com.sourcerebels

class HomeController {

    def postService
    def index = {
		[postList: postService.list()]
	}
}

HomeControllerTests.groovy

package com.sourcerebels

import static org.hamcrest.CoreMatchers.*
import static org.junit.Assert.assertThat
import static org.junit.matchers.JUnitMatchers.*
import grails.test.*


class HomeControllerTests extends ControllerUnitTestCase {

	void test_should_retrieve_post_list() {
		
		def postService = mockFor(PostService)
		postService.demand.list(1) {->
			return [new Post(title: "post1", content: "content1"),
				new Post(title: "post2", content: "content2")]
		}
		controller.postService = postService.createMock()
		def model = controller.index()
		
		postService.verify()
		
		assertNotNull model["postList"]
		assertThat model["postList"].size(), is(2)
    }
}

PostService.groovy

package com.sourcerebels

class PostService {

    static transactional = true

    def list() {

		return Post.list()
    }	
}