我正在udemy上学习Spring 5等，我在测试我们的应用程序的部分。到现在为止一切都很好，我能够连接到PostgreSQL数据库，但现在我被困在这个测试失败，因为2天。
我不明白是什么导致测试失败。应用程序运行，但测试没有。下面是测试类：

package com.ghevi.dao;

import com.ghevi.pma.ProjectManagementApplication;
import com.ghevi.pma.dao.ProjectRepository;
import com.ghevi.pma.entities.Project;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.jdbc.Sql;
import org.springframework.test.context.jdbc.SqlGroup;
import org.springframework.test.context.junit4.SpringRunner;

import static org.junit.Assert.assertEquals;

@ContextConfiguration(classes= ProjectManagementApplication.class)
@RunWith(SpringRunner.class)
@DataJpaTest // for temporary databases like h2
@SqlGroup({
        @Sql(executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD, scripts = {"classpath:schema.sql", "classpath:data.sql"}),
        @Sql(executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD, scripts = "classpath:drop.sql")
})
public class ProjectRepositoryIntegrationTest {

    @Autowired
    ProjectRepository proRepo;

    @Test
    public void ifNewProjectSaved_thenSuccess(){
        Project newProject = new Project("New Test Project", "COMPLETE", "Test description");
        proRepo.save(newProject);

        assertEquals(5, proRepo.findAll().size());
    }

}

下面是堆栈跟踪：
https://pastebin.com/WcjNU76p
员工类（不要介意这些评论，它们可能是垃圾）：

package com.ghevi.pma.entities;

import javax.persistence.*;
import java.util.List;

@Entity
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "employee_seq") // AUTO for data insertion in the class projmanagapplication (the commented out part), IDENTITY let hibernate use the database id counter.
    private long employeeId;                            // The downside of IDENTITY is that if we batch a lot of employees or projects it will be much slower to update them, we use SEQUENCE now that we have schema.sql (spring does batch update)

    private String firstName;
    private String lastName;
    private String email;

    // @ManyToOne many employees can be assigned to one project
    // Cascade, the query done on projects it's also done on children entities
    @ManyToMany(cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.REFRESH, CascadeType.PERSIST}, // Standard in the industry, dont use the REMOVE (if delete project delete also children) or ALL (because include REMOVE)
               fetch = FetchType.LAZY)  // LAZY is industry standard it loads project into memory, EAGER load also associated entities so it slows the app, so we use LAZY and call child entities later
    //@JoinColumn(name="project_id")  // Foreign key, creates a new table on Employee database
    @JoinTable(name = "project_employee",  // Merge the two table using two foreign keys
               joinColumns = @JoinColumn(name="employee_id"),
               inverseJoinColumns = @JoinColumn(name="project_id"))

    private List<Project> projects;

    public Employee(){

    }

    public Employee(String firstName, String lastName, String email) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    public List<Project> getProjects() {
        return projects;
    }

    public void setProjects(List<Project> projects) {
        this.projects = projects;
    }

    /* Replaced with List<Project>
    public Project getProject() {
        return project;
    }

    public void setProject(Project project) {
        this.project = project;
    }
    */

    public long getEmployeeId() {
        return employeeId;
    }

    public void setEmployeeId(long employeeId) {
        this.employeeId = employeeId;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

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

这也是schema.sql，我在这里引用了这些序列，因为这个文件是由测试运行的，我刚刚注意到IntelliJ在这个文件中标记了一些错误。例如，它将一些空格和TABLE的T标记为红色，说：
第一次