Spring Test cannot get Spring Configuration Beans

Question

@ContextConfiguration(loader = AnnotationConfigContextLoader.class)
@ActiveProfiles(profiles = "test")
@RunWith(MockitoJUnitRunner.class)
public class ConfigurationTest {
    @Autowired
    private Environment environment;

    @Test
    public void test1() throws Exception {
        environment.getProperty("bhavya",Boolean.class);
    }

    @Configuration
    @Profile("test")
    @ComponentScan(basePackages={"com.bhavya.test"})
    public static class EnvironmentServiceTestConfiguration{

        @Bean
        @Primary
        public Environment environment(){
           return Mockito.mock(Environment.class);
        }
    }
}

I also tried putting EnvironmentServiceTestConfiguration as a non-inner non-static class, but didn't help.

Here is what I tried in a separate class:

@RunWith(MockitoJUnitRunner.class)
@Profile("test")
@Configuration
class EnvironmentServiceTestConfiguration{

    @Bean
    @Primary
    public Environment environment(){
        return Mockito.mock(Environment.class)
    }
}

didn't work either

The test class is located in test/java/com.bhavya.test package. I am trying to run this particular test test1

This is my first test of such kind. I have never before used AnnotationConfigContextLoader.class, enlighten me.

Stacktrace :

java.lang.NullPointerException

at Line number where I have statement :

environment.getProperty("bhavya",Boolean.class);

Answer 1

Try using @RunWith(SpringJUnit4ClassRunner.class)

Here is an example explaining how can be done https://www.mkyong.com/unittest/junit-spring-integration-example/

Here is a code sample that works for the sample in the question:

package com.example.demo.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.env.Environment;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.support.AnnotationConfigContextLoader;

import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.when;

@ContextConfiguration(loader = AnnotationConfigContextLoader.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class ConfigurationTest {
    @Autowired
    private Environment environment;

    @Test
    public void test1() throws Exception {
        System.out.println(environment.getProperty("bhavya",Boolean.class));
    }

    @Configuration
    @ComponentScan(basePackages={"com.example.demo.test"})
    public static class EnvironmentServiceTestConfiguration{

        @Bean
        @Primary
        public Environment environment(){
            Environment env =  Mockito.mock(Environment.class);
            when(env.getProperty(eq("bhavya"), eq(Boolean.class))).thenReturn(true);

            return env;
        }
    }
}