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Editor to share with you how to solve the Spring boot integration of Junit encountered in the pit, I believe that most people do not know much, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to understand it!

This is the pit I encountered when integrating Junit with springboot. Add the dependency org.springframework.boot spring-boot-starter-test2 of junit environment to pom.xml. Set up test class under src/test/java

Example:

@ RunWith (value = SpringJUnit4ClassRunner.class) @ SpringBootTest (classes= {Demo.class}) / / * * Note: the startup class is written for itself (this is a hole) * * public class serviceTest {@ Autowired private serviceImpl serviceimpl; @ Test public void testAdd () {this.serviceimpl.add ();}} 3. The self-written startup class @ SpringBootApplicationpublic class Demo {public static void main (String [] args) {SpringApplication springApplication = new SpringApplication (Demo.class); / / this is the icon to turn off springboot startup without setting springApplication.setBannerMode (Banner.Mode.OFF); springApplication.run (args);}}

Description:

@ RunWith: initiator SpringJUnit4ClassRunner.class: integrate junit with spring environment

@ SpringBootTest (classes= {App.class})

1: the current class is the test class of springBoot

2: load the SpringBoot startup class (the startup class writes its own startup class (this is a pit). Start SpringBoot

SpringBoot integration Junit test injection Bean failed

Java.lang.IllegalStateException: Failed to load ApplicationContext

Problem description

I reported an error during the springboot integration test. To run is to report that all kinds of bean can not be found.

Version: springboot-1.5.12 + junit4.12

It took a long time to solve the problem. I searched several blogs on the Internet and tried them, but basically all of them were of no use.

What to add @ WebAppConfiguration this annotation, ah, add that annotation, all useless.

Here is my test class

11111

Solution process

I took a closer look at the startup class, because this @ SpringBootTest I set up the startup class. It turns out that the bean that can't be found in the original injection is actually the object in the startup class that uses dependency injection.

Here is my startup class

From this, I infer that although springboot comes with a scan package (the default scanning rule is subpackages above the startup class), he may follow java's top-down code execution rule, because he is an integration test after all, and he is not the same concept as starting a project directly from the startup class. When he has to rely on injecting the object, but the object is not actually placed in the container, the injection is not successful.

Finally, a @ ComponentScan (basePackages = {"com.xjgx"}) is added to the startup class to scan the whole package. Successfully solved!

Add @ ComponentScan annotations to the configuration class. By default, this annotation scans all configuration classes under the package in which the class resides, which is equivalent to the previous context:component-scan.

Summary

Springboot integrates junit testing methods, and these two annotations are actually fine.

RunWith (SpringRunner.class) @ SpringBootTest (classes = EhrApplication.class) public class EhrApplicationTest {@ Autowired HealthExamReSerivice healthExamReSerivice; @ Test public void contextLoads () {}}

If the startup class uses a dependency injection object, you need to add a scan package to the startup class.

@ ComponentScan (basePackages = {"com.xjgx"}) these are all the contents of this article entitled "how to solve the pitfalls encountered in Spring boot Integration Junit". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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