Grails 3 Unit Testing (Controller)

grails-unit-testing-controller.groovy

// Given the controller
class DemoController {
    def hello() {
        render "greetings!"
    }
    
    def greet() {
        redirect action: 'hello'
    }
}

// Write the following test:

package com.demo

import grails.test.mixin.TestFor
import spock.lang.Specification

@TestFor(DemoController)
class DemoControllerSpec extends Specification {
    void "test hello"() {
        when:
        controller.hello()
        
        then:
        response.text == 'greetings!'
    }
    
    void "test greet"() {
        when:
        controller.greet()
        
        then:
        response.redirectedUrl == '/demo/hello'
    }
    
    void "test something"() {
        when:
        // you can test params
        params.sort = 'name'
        params.max = 20
        params.offset = 0
        request.method = 'GET'
        request.makeAjaxRequest()
        controller.list()
        
        then:
        response.text == 'something'
        
        response.xml.@title.text() == 'Great'
        
        response.text == '{"book":"Great"}'
        response.json.book == 'Great'
        
        // see http://docs.grails.org/2.4.x/api/org/codehaus/groovy/grails/web/sitemesh/GrailsContentBufferingResponse.html
        response.status == SC_METHOD_NOT_ALLOWED // or: SC_OK, SC_CREATED, SC_UNAUTHORIZED, SC_NOT_FOUND, etc.
        
        response.redirectedUrl == '/some/where'     
    }
}

in Grails 3.3 the unit tests should implement ControllerUnitTest and not have TestFor