Unable to load project environment variable in Spring Boot Unit Test-CodePudding

I have some variables defined in application-local.yml in my spring boot project and these variables are used in many of the services by using @Value annotation. Now while trying to unit test these services, the service is unable to retrieve the value of the variable from the application-local.yml and instead is throwing NullPointer Exception. What should I do?

application-local.yml :

variables:
    maxVal: 24

Service.java

@Value("${variables.maxVal:24}")
public Integer maxima;

FunctionA()
{
  return maxima 1;
}

Unit Test

@Test
testFunctionA()
{
  assert.assertEquals(25,FunctionA())
}

CodePudding user response：

your properties file is not being loaded. the proper manner for test properties is to use a application-test.yaml, located under test/resources, it will be automatically loaded when you run your tests.

CodePudding user response：

You can injecting the property in the context with Spring Boot in this simple way thanks to the properties attribute of @SpringBootTest :

@SpringBootTest(properties="property.value=dummyValue")
public class FooTest{
    
   @Autowired
   Foo foo;
     
   @Test
   public void doThat(){
       ...
   }    
}

You could use as alternative @TestPropertySource but it adds an additional annotation :

@SpringBootTest
@TestPropertySource(properties="property.value=dummyValue")
public class FooTest{ ...}

With Spring (without Spring Boot), it should be a little more complicated but as I didn't use Spring without Spring Boot from a long time I don't prefer say a stupid thing.

As a side note : if you have many @Value fields to set, extracting them into a class annotated with @ConfigurationProperties is more relevant because we don't want a constructor with too many arguments.

Hope thats helped .