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Spring Boot Testing

We can test our application using Junit or Spock, and we will see both. Also you can make unit, integration and functional testing.

Integration testing

Spring Boot provides a @SpringApplicationConfiguration annotation as an alternative to the standard @ContextConfiguration annotation.

package com.jos.dem.jmailer

import static org.junit.Assert.assertEquals

import org.junit.Test
import org.junit.runner.RunWith
import org.springframework.boot.test.SpringApplicationConfiguration
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.mail.javamail.JavaMailSenderImpl

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = JmailerApplication.class)
class JmailerApplicationTests {

  @Autowired
  JavaMailSenderImpl javaMailSender

  @Test
  void shouldLoadContext() {
    assertEquals('smtp.gmail.com', javaMailSender.host)
    assertEquals(587, javaMailSender.port)
  }

}

We can run this test with:

gradle -Dtest.single=JmailerApplicationTests test -Dspring.config.location=$HOME/.spring/application-DEVELOPMENT.yml

Using Spock we need to use @ContextConfiguration to load our context, here is an integration test example:

package com.jos.dem.jmailer.service

import spock.lang.Specification

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.SpringApplicationContextLoader
import org.springframework.boot.test.IntegrationTest
import org.springframework.test.context.ContextConfiguration

import com.jos.dem.jmailer.JmailerApplication
import com.jos.dem.jmailer.command.MessageCommand

@ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = JmailerApplication.class)
@IntegrationTest
class NotificationServiceSpec extends Specification {

  @Autowired
  NotificationService notificationService

  String email = 'joseluis.delacruz@gmail.com'

  void "should send an email"(){
    given:"A MessageCommand"
      def messageCommand = new MessageCommand(email:email, message:'Hello from spock')
    when:"We send notification"
      def result = notificationService.sendNotification(messageCommand)
    then:"We expect email sent"
      result
  }
}

For this to work you need to have org.spockframework:spock-spring on the dependencies.

buildscript {
  ext {
    springBootVersion = '1.3.0.RELEASE'
  }
  repositories {
    mavenCentral()
  }
  dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
  }
}

apply plugin: 'groovy'
apply plugin: 'spring-boot'

jar {
  baseName = 'jmailer-spring-boot'
  version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
  mavenCentral()
}

dependencies {
  compile 'org.springframework.boot:spring-boot-starter-web'
  compile 'org.springframework.boot:spring-boot-starter-aop'
  compile 'org.springframework.boot:spring-boot-starter-mail'
  compile 'org.springframework.boot:spring-boot-starter-thymeleaf'
  compile 'org.springframework:spring-jms'
  compile 'org.apache.activemq:activemq-broker'
  compile 'org.codehaus.groovy:groovy:2.4.5'
  compile 'org.freemarker:freemarker:2.3.23'
  testCompile 'org.spockframework:spock-spring:1.0-groovy-2.4'
  testCompile 'org.springframework.boot:spring-boot-starter-test'
}

task wrapper(type: Wrapper) {
  gradleVersion = '2.7'
}

bootRun {
  systemProperties = System.properties
}

test {
  systemProperties = System.properties
}

We can run all the test whit this command:

gradle test -Dspring.config.location=$HOME/.spring/application-DEVELOPMENT.yml

Unit testing

Unit testing is normally used when you want to test a single class with its methods

package com.jos.dem.jmailer

import spock.lang.Specification

import com.jos.dem.jmailer.controller.EmailerController
import com.jos.dem.jmailer.service.EmailerFormatter
import com.jos.dem.jmailer.service.EmailerService
import com.jos.dem.jmailer.command.Command
import com.jos.dem.jmailer.command.MessageCommand

class EmailerControllerSpec extends Specification{

  EmailerController controller = new EmailerController()

  EmailerFormatter emailerFormatter = Mock(EmailerFormatter)
  EmailerService emailerService = Mock(EmailerService)

  def setup(){
    controller.emailerFormatter = emailerFormatter
    controller.emailerService = emailerService
  }

  void "should send a message from a form"(){
    given:"A messageCommand"
      Command command = new MessageCommand(email:'josdem@email.com')
    when:"We send message"
      emailerFormatter.format(command) >> command
      controller.form(command)
    then:"We expect message sent"
    1 * emailerService.sendEmail(command)
  }

}

To download the project

git clone https://github.com/josdem/jmailer-spring-boot.git
git fetch
git checkout feature/testing

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