Does spring use application.properties in unit test?

Mojtaba Asg :

I use spring boot for my project. When i run my app everthing is OK by if i run my unit test (@RunWith(SpringJUnit4ClassRunner)), i got below error. I don't know why spring didn't use application.properties in unit test(which data source parameters defined).

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:579)
    ... 106 more
Caused by: org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:236)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:176)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:43)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:81)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 107 more

my unit test class is :

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = Application.class)
public class RepoTest {

    @Autowired IRepo repo;

    @Test
    public void listCards() {
        repo.findCardNo(1L, "00981231231");
    }

}

Darren Forsythe :

Use @SpringBootTest instead of ContextConfiguration the SpringBootTest adds some more magic, and will load the entire configuration and for all intents and purpose the boot application too. Context Configuration will just load up a Spring context without a lot of the Spring Boot magic.

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