Failed to load ApplicationContext testing SpringBoot JPA

I am trying to make integration tests for testing spring jpa interfaces.

I have got the error java.lang.IllegalStateException: Failed to load ApplicationContext and i am unsure why this is the case. I am practically following this tutorial.

StackTrace

java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:94)
at org.springframework.test.context.DefaultTestContext.getApplicationContext(DefaultTestContext.java:72)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:212)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:200)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:259)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:261)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:219)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.IllegalArgumentException: Cannot load an ApplicationContext with a NULL 'contextLoader'. Consider annotating your test class with @ContextConfiguration or @ContextHierarchy.
at org.springframework.util.Assert.notNull(Assert.java:115)
at org.springframework.test.context.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:61)
at org.springframework.test.context.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:86)
... 25 more

Application.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

User.java

@Entity
@Table(name = "users")
public class User {

  // ------------------------
  // PRIVATE FIELDS
  // ------------------------

  // An autogenerated id (unique for each user in the db)
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private long id;

  // The user's email
  @NotNull
  private String email;

  // The user's name
  @NotNull
  private String name;

  // ------------------------
  // PUBLIC METHODS
  // ------------------------

  public User() { }

  public User(long id) { 
    this.id = id;
  }

  public User(String email, String name) {
    this.email = email;
    this.name = name;
  }

  // Getter and setter methods

  public long getId() {
    return id;
  }

  public void setId(long value) {
    this.id = value;
  }

  public String getEmail() {
    return email;
  }

  public void setEmail(String value) {
    this.email = value;
  }

  public String getName() {
    return name;
  }

  public void setName(String value) {
    this.name = value;
  }

} // class User

UserRepository.java

import javax.transaction.Transactional;

import org.springframework.data.repository.CrudRepository;

@Transactional
public interface UserRepository extends CrudRepository<User, Long> {

}

UserController.java

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    UserRepository ur;

    @RequestMapping(value = "{id}", method = RequestMethod.GET)
    @ResponseBody
    public String getName(@PathVariable("id") Long id) {
        User a = ur.findOne(id);
        return a.getName();
    }

    @RequestMapping(value = "{name}", method = RequestMethod.POST)
    @ResponseBody
    public String setUser(@PathVariable("name") String name) {
        User usr = new User("email@email.com", name);
        ur.save(usr);
        return name + "Created";
    }
}

user-entries.xml

<dataset>
    <users id="1"
           email="jon@email.com"
           name="Jon"/>
    <users id="2"
           email="mike@email.com"
           name="Mike"/>
</dataset>

UserTest.java

import javax.persistence.PersistenceContext;

import org.hamcrest.collection.IsIterableWithSize;
import static org.hamcrest.MatcherAssert.assertThat;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestExecutionListeners;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.support.DependencyInjectionTestExecutionListener;
import org.springframework.test.context.transaction.TransactionalTestExecutionListener;

import com.github.springtestdbunit.DbUnitTestExecutionListener;
import com.github.springtestdbunit.annotation.DatabaseSetup;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {PersistenceContext.class})
@TestExecutionListeners({DependencyInjectionTestExecutionListener.class,
        TransactionalTestExecutionListener.class,
        DbUnitTestExecutionListener.class})
@DatabaseSetup("users-entries.xml")
public class UserTest {

    @Autowired
    private UserRepository userRepo;

    @Test
    public void findbyName_usingName() {
        Iterable<User> searchResults = userRepo.findAll();
        assertThat(searchResults, IsIterableWithSize.<User>iterableWithSize(2));    }
}

application.properties

# ===============================
# = DATA SOURCE
# ===============================

# Set here configurations for the database connection

# Connection url for the database "netgloo_blog"
spring.datasource.url = jdbc:mysql://localhost:3306/test
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

# Username and password
spring.datasource.username = root
spring.datasource.password = blah

# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1

# ===============================
# = JPA / HIBERNATE
# ===============================

# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager).

# Show or not log for each sql query
spring.jpa.show-sql = true

# Hibernate ddl auto (create, create-drop, update): with "update" the database
# schema will be automatically updated accordingly to java entities found in
# the project
spring.jpa.hibernate.ddl-auto = update

# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

# Allows Hibernate to generate SQL optimized for a particular DBMS
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

If anyone can spot the root cause of this error, it would be much appreciated.