用Grails写单元测试

新的领域，多练练，这样写出的程序，确实坚固些。

也要理解集成测试与数据库相关，单元测试与类方法有关。

如果测试文件没有建立，按如下操作：

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.

还有，好像现在GRAILS自动生成的测试样码不太对，改成书上的就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
        }
}