用Grails寫單元測試

新的領域，多練練，這樣寫出的程序，確實堅固些。

也要理解集成測試與數據庫相關，單元測試與類方法有關。

若是測試文件沒有創建，按以下操做：

Unit tests are generated automatically for any Grails artifacts you create using the
Grails shell commands ( grails create-controller for example). If you create an
artifact by hand in a text editor or by copy/paste, you can create a shell test using the
grails create-unit-test command.

還有，好像如今GRAILS自動生成的測試樣碼不太對，改爲書上的就OK了。

package com.grailsinaction

import grails.test.mixin.TestMixin
import grails.test.mixin.TestFor
import grails.test.mixin.Mock
import grails.test.mixin.support.GrailsUnitTestMixin
import spock.lang.*

/**
 * See the API for {@link grails.test.mixin.support.GrailsUnitTestMixin} for usage instructions
 */
@TestFor(PostController)
@Mock([User, Post])
class PostControllerSpec extends Specification {

    def "Get a users timeline given their id"() {
            given: "A user with posts in the db"
            User chuck = new User(
                                        loginId: "chuck_norris",
                                        password: "password")
            chuck.addToPosts(new Post(content: "A first post"))
            chuck.addToPosts(new Post(content: "A second post"))
            chuck.save(failOnError: true)
            
            and: "A loginId parameter"
            params.id = chuck.loginId
            
            when: "the timeline is invoked"
            def model = controller.timeline()
            
            then: "the user is in the returned model"
            model.user.loginId == "chuck_norris"
            model.user.posts.size() == 2
        }
        
        def "Check that non-existent users are handled with an error"() {
            given: "the id of a non-existent user"
            params.id = "this-user-id-does-not-exist"
            
            when: "the timeline is invoked"
            controller.timeline()
            
            then: "a 404 is sent to the browser"
            response.status == 404
        }
}