mongo-db-demo added

2026-05-30 10:50:42 +00:00 · 2019-04-01 23:05:36 +04:00
parent 6620521317
commit cd6f9757df
28 changed files with 675 additions and 1 deletions
@@ -4,4 +4,5 @@

 * *unit-testing-plain-spring* - пример тестирования в проектах на чистом Spring
 * *unit-testing-spring-boot* - то же самое, только на Spring Boot
-* *hibernate-fetch-mode-demo* - демонстрация настроек Hibernate, в частности для решения проблемы N+1
+* *hibernate-fetch-mode-demo* - демонстрация настроек Hibernate, в частности для решения проблемы N+1
+* *mongo-db-demo* - демонстрация подходов к хранению вложенных сущностенй в MongoDB, работы с MongoEventListener, агрегациями и инструментом миграций Mongock
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,7 @@
+## Пример работы с MongoDB
+
+В примере демонстрируется:
+* *два подхода к хранению вложенных сущностей*
+* *инициализация базы данными с помощью инструмента миграций Mongock*   
+* *использование AbstractMongoEventListener для выполнения каскадных операций*
+* *работа с массивами с помощью агрегаций и Criteria api*
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.3.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>mongo-db-demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>mongo-db-demo</name>
+    <description>Demo project for MongoDB</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+        <maven.compiler.sourcre>1.8.</maven.compiler.sourcre>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-mongodb</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>com.github.cloudyrock.mongock</groupId>
+            <artifactId>mongock-spring</artifactId>
+            <version>2.0.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.assertj</groupId>
+                    <artifactId>org.assertj.core</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+
+        <!--Тестирование-->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>2.21.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-junit-jupiter</artifactId>
+            <version>2.23.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.12.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>de.flapdoodle.embed</groupId>
+            <artifactId>de.flapdoodle.embed.mongo</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+    <repositories>
+        <repository>
+            <id>spring-milestones</id>
+            <name>Spring Milestones</name>
+            <url>https://repo.spring.io/milestone</url>
+        </repository>
+    </repositories>
+
+</project>
@@ -0,0 +1,15 @@
+package ru.otus.example.mongoDbDemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+
+@SpringBootApplication
+@EnableConfigurationProperties
+public class MongoDbDemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(MongoDbDemoApplication.class, args);
+	}
+
+}
@@ -0,0 +1,42 @@
+package ru.otus.example.mongoDbDemo.changelogs;
+
+import com.github.cloudyrock.mongock.ChangeLog;
+import com.github.cloudyrock.mongock.ChangeSet;
+import com.mongodb.client.MongoDatabase;
+import lombok.val;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+import ru.otus.example.mongoDbDemo.model.Student;
+import ru.otus.example.mongoDbDemo.model.Teacher;
+
+@ChangeLog(order = "001")
+public class InitMongoDBDataChangeLog {
+
+    private Knowledge springDataKnowledge;
+    private Knowledge mongockKnowledge;
+    private Knowledge aggregationApiKnowledge;
+
+    @ChangeSet(order = "000", id = "dropDB", author = "stvort", runAlways = true)
+    public void dropDB(MongoDatabase database){
+        database.drop();
+    }
+
+    @ChangeSet(order = "001", id = "initKnowledges", author = "stvort", runAlways = true)
+    public void initKnowledges(MongoTemplate template){
+        springDataKnowledge = template.save(new Knowledge("Spring Data"));
+        mongockKnowledge = template.save(new Knowledge("Mongock"));
+        aggregationApiKnowledge = template.save(new Knowledge("AggregationApi"));
+    }
+
+    @ChangeSet(order = "002", id = "initStudents", author = "stvort", runAlways = true)
+    public void initStudents(MongoTemplate template){
+        val student = new Student("Student #1", springDataKnowledge, mongockKnowledge);
+        template.save(student);
+    }
+
+    @ChangeSet(order = "003", id = "Teacher", author = "stvort", runAlways = true)
+    public void initTeachers(MongoTemplate template){
+        val teacher = new Teacher("Teacher #1", springDataKnowledge, mongockKnowledge, aggregationApiKnowledge);
+        template.save(teacher);
+    }
+}
@@ -0,0 +1,20 @@
+package ru.otus.example.mongoDbDemo.config;
+
+import com.github.cloudyrock.mongock.Mongock;
+import com.github.cloudyrock.mongock.SpringMongockBuilder;
+import com.mongodb.MongoClient;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class ApplicationConfig {
+
+    private static final String CHANGELOGS_PACKAGE = "ru.otus.example.mongoDbDemo.changelogs";
+
+    @Bean
+    public Mongock mongock(MongoProps mongoProps, MongoClient mongoClient) {
+        return new SpringMongockBuilder(mongoClient, mongoProps.getDatabase(), CHANGELOGS_PACKAGE)
+                .setLockQuickConfig()
+                .build();
+    }
+}
@@ -0,0 +1,14 @@
+package ru.otus.example.mongoDbDemo.config;
+
+import lombok.Data;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Data
+@Component
+@ConfigurationProperties("spring.data.mongodb")
+public class MongoProps {
+    private int port;
+    private String database;
+    private String uri;
+}
@@ -0,0 +1,24 @@
+package ru.otus.example.mongoDbDemo.events;
+
+import lombok.RequiredArgsConstructor;
+import lombok.val;
+import org.springframework.data.mongodb.core.mapping.event.AbstractMongoEventListener;
+import org.springframework.data.mongodb.core.mapping.event.AfterDeleteEvent;
+import org.springframework.stereotype.Component;
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+import ru.otus.example.mongoDbDemo.repositories.StudentRepository;
+
+@Component
+@RequiredArgsConstructor
+public class MongoKnowledgeCascadeDeleteEventsListener extends AbstractMongoEventListener<Knowledge> {
+
+    private final StudentRepository studentRepository;
+
+    @Override
+    public void onAfterDelete(AfterDeleteEvent<Knowledge> event) {
+        super.onAfterDelete(event);
+        val source = event.getSource();
+        val id = source.get("_id").toString();
+        studentRepository.removeExperienceArrayElementsById(id);
+    }
+}
@@ -0,0 +1,27 @@
+package ru.otus.example.mongoDbDemo.events;
+
+import lombok.RequiredArgsConstructor;
+import lombok.val;
+import org.springframework.data.mongodb.core.mapping.event.AbstractMongoEventListener;
+import org.springframework.data.mongodb.core.mapping.event.BeforeConvertEvent;
+import org.springframework.stereotype.Component;
+import ru.otus.example.mongoDbDemo.model.Student;
+import ru.otus.example.mongoDbDemo.repositories.KnowledgeRepository;
+
+import java.util.Objects;
+
+@Component
+@RequiredArgsConstructor
+public class MongoStudentCascadeSaveEventsListener extends AbstractMongoEventListener<Student> {
+
+    private final KnowledgeRepository knowledgeRepository;
+
+    @Override
+    public void onBeforeConvert(BeforeConvertEvent<Student> event) {
+        super.onBeforeConvert(event);
+        val student = event.getSource();
+        if (student.getExperience() != null) {
+            student.getExperience().stream().filter(e -> Objects.isNull(e.getId())).forEach(knowledgeRepository::save);
+        }
+    }
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.mongoDbDemo.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Document
+public class Knowledge {
+    @Id
+    private String id;
+    private String name;
+
+    public Knowledge(String name) {
+        this.name = name;
+    }
+}
@@ -0,0 +1,29 @@
+package ru.otus.example.mongoDbDemo.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.DBRef;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+import java.util.Arrays;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Document
+public class Student {
+    @Id
+    private String id;
+    private String name;
+
+    @DBRef
+    private List<Knowledge> experience;
+
+    public Student(String name, Knowledge... experience) {
+        this.name = name;
+        this.experience = Arrays.asList(experience);
+    }
+}
@@ -0,0 +1,28 @@
+package ru.otus.example.mongoDbDemo.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+import java.util.Arrays;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Document
+public class Teacher {
+    @Id
+    private String id;
+    private String name;
+
+    private List<Knowledge> experience;
+
+    public Teacher(String name, Knowledge... experience) {
+        this.name = name;
+        this.experience = Arrays.asList(experience);
+
+    }
+}
@@ -0,0 +1,7 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+
+public interface KnowledgeRepository extends MongoRepository<Knowledge, String> {
+}
@@ -0,0 +1,8 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+import ru.otus.example.mongoDbDemo.model.Student;
+
+
+public interface StudentRepository extends MongoRepository<Student, String>, StudentRepositoryCustom {
+}
@@ -0,0 +1,6 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+public interface StudentRepositoryCustom {
+    long getExperienceArrayLengthByStudentId(String id);
+    void removeExperienceArrayElementsById(String id);
+}
@@ -0,0 +1,42 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+import lombok.val;
+import org.bson.types.ObjectId;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.core.aggregation.Aggregation;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.data.mongodb.core.query.Update;
+import ru.otus.example.mongoDbDemo.model.Student;
+
+
+import static org.springframework.data.mongodb.core.query.Criteria.where;
+
+@RequiredArgsConstructor
+public class StudentRepositoryCustomImpl implements StudentRepositoryCustom {
+
+    @Data
+    private class ArraySizeProjection {
+        private int size;
+    }
+
+    private final MongoTemplate mongoTemplate;
+
+    public long getExperienceArrayLengthByStudentId(String id) {
+        val aggregation = Aggregation.newAggregation(
+                Aggregation.match(where("id").is(id)),
+                Aggregation.project().andExclude("_id").and("experience").size().as("size"));
+
+        val arraySizeProjection = mongoTemplate.aggregate(aggregation, Student.class, ArraySizeProjection.class).getUniqueMappedResult();
+        return arraySizeProjection == null ? 0 : arraySizeProjection.getSize();
+    }
+
+    public void removeExperienceArrayElementsById(String id) {
+        val query = Query.query(Criteria.where("$id").is(new ObjectId(id)));
+        val update = new Update().pull("experience", query);
+        mongoTemplate.updateMulti(new Query(), update, Student.class);
+    }
+
+}
@@ -0,0 +1,7 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+import ru.otus.example.mongoDbDemo.model.Teacher;
+
+public interface TeacherRepository extends MongoRepository<Teacher, String>, TeacherRepositoryCustom {
+}
@@ -0,0 +1,9 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+
+import java.util.List;
+
+public interface TeacherRepositoryCustom {
+    List<Knowledge> getTeacherExperienceById(String teacherId);
+}
@@ -0,0 +1,28 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import lombok.RequiredArgsConstructor;
+import lombok.val;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.core.query.Criteria;
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+import ru.otus.example.mongoDbDemo.model.Teacher;
+
+import java.util.List;
+
+import static org.springframework.data.mongodb.core.aggregation.Aggregation.*;
+
+@RequiredArgsConstructor
+public class TeacherRepositoryCustomImpl implements TeacherRepositoryCustom {
+
+    private final MongoTemplate mongoTemplate;
+
+    @Override
+    public List<Knowledge> getTeacherExperienceById(String teacherId) {
+        val aggregation = newAggregation(
+                match(Criteria.where("id").is(teacherId))
+                , unwind("experience")
+                , project().andExclude("_id").and("experience.id").as("_id").and("experience.name").as("name")
+        );
+        return mongoTemplate.aggregate(aggregation, Teacher.class, Knowledge.class).getMappedResults();
+    }
+}
@@ -0,0 +1,6 @@
+spring:
+  data:
+    mongodb:
+      uri: mongodb://localhost
+      port: 27017
+      database: test
@@ -0,0 +1,13 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.test.autoconfigure.data.mongo.DataMongoTest;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.test.annotation.DirtiesContext;
+
+@DataMongoTest
+@EnableConfigurationProperties
+@ComponentScan({"ru.otus.example.mongoDbDemo.config", "ru.otus.example.mongoDbDemo.repositories"})
+@DirtiesContext(methodMode = DirtiesContext.MethodMode.BEFORE_METHOD)
+abstract class AbstractRepositoryTest {
+}
@@ -0,0 +1,41 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import lombok.val;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.ComponentScan;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@DisplayName("KnowledgeRepository при наличии listener-ов в контексте ")
+@ComponentScan("ru.otus.example.mongoDbDemo.events")
+class KnowledgeRepositoryWithListenerTest extends AbstractRepositoryTest {
+
+    @Autowired
+    private KnowledgeRepository knowledgeRepository;
+
+    @Autowired
+    private StudentRepository studentRepository;
+
+    @DisplayName("при удалении Knowledge должен удалить его из опыта студента")
+    @Test
+    void shouldRemoveKnowledgeFromStudentExperienceWhenRemovingKnowledge() {
+
+        // Загрузка студента и его пе
+        val students = studentRepository.findAll();
+        val student = students.get(0);
+        val experience = student.getExperience();
+        val firstKnowledge = experience.get(0);
+
+        knowledgeRepository.delete(firstKnowledge);
+
+        val expectedExperienceArrayLength = experience.size() - 1;
+        val actualExperienceArrayLength = studentRepository.getExperienceArrayLengthByStudentId(student.getId());
+        assertThat(actualExperienceArrayLength).isEqualTo(expectedExperienceArrayLength);
+
+        val actualStudentOptional = studentRepository.findById(student.getId());
+        assertThat(actualStudentOptional.get().getExperience().size()).isEqualTo(expectedExperienceArrayLength);
+
+    }
+}
@@ -0,0 +1,39 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import lombok.val;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@DisplayName("KnowledgeRepository при отсутствии listener-ов в контексте ")
+class KnowledgeRepositoryWithoutListenerTest extends AbstractRepositoryTest {
+
+    @Autowired
+    private KnowledgeRepository knowledgeRepository;
+
+    @Autowired
+    private StudentRepository studentRepository;
+
+    @DisplayName("при удалении Knowledge не должен удалять его из опыта студента")
+    @Test
+    void shouldLeaveKnowledgeInStudentExperienceWhenRemovingKnowledge() {
+
+        // Загрузка студента и его пе
+        val students = studentRepository.findAll();
+        val student = students.get(0);
+        val experience = student.getExperience();
+        val firstKnowledge = experience.get(0);
+
+        knowledgeRepository.delete(firstKnowledge);
+
+        val expectedExperienceArrayLength = experience.size();
+        val actualExperienceArrayLength = studentRepository.getExperienceArrayLengthByStudentId(student.getId());
+        assertThat(actualExperienceArrayLength).isEqualTo(expectedExperienceArrayLength);
+
+        val actualStudentOptional = studentRepository.findById(student.getId());
+        assertThat(actualStudentOptional.get().getExperience().size()).isNotEqualTo(expectedExperienceArrayLength);
+
+    }
+}
@@ -0,0 +1,29 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import lombok.val;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.ComponentScan;
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+import ru.otus.example.mongoDbDemo.model.Student;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DisplayName("StudentRepository при наличии listener-ов в контексте ")
+@ComponentScan("ru.otus.example.mongoDbDemo.events")
+class StudentRepositoryWithListenersTest extends AbstractRepositoryTest {
+
+    @Autowired
+    private StudentRepository studentRepository;
+
+    @DisplayName("должен корректно сохранять студента с отсутствующими в БД знаниями")
+    @Test
+    void shouldCorrectSaveStudentWithNewKnowledge(){
+        val student = new Student("Student #2", new Knowledge("Knowledge #3"));
+        val actual = studentRepository.save(student);
+        assertThat(actual.getId()).isNotNull();
+        assertThat(actual.getName()).isEqualTo(student.getName());
+    }
+
+}
@@ -0,0 +1,25 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import lombok.val;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mapping.MappingException;
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+import ru.otus.example.mongoDbDemo.model.Student;
+
+import static org.assertj.core.api.Assertions.*;
+
+@DisplayName("StudentRepository при отсутствии listener-ов в контексте ")
+class StudentRepositoryWithoutListenerTest extends AbstractRepositoryTest {
+
+    @Autowired
+    private StudentRepository studentRepository;
+
+    @DisplayName("должен кидать MappingException во время сохранения студента с отсутствующими в БД знаниями")
+    @Test
+    void shouldThrowMappingExceptionWhenSaveStudentWithNewKnowledge(){
+        val student = new Student("Student #2", new Knowledge("Knowledge #3"));
+        assertThatThrownBy(() -> studentRepository.save(student)).isInstanceOf(MappingException.class);
+    }
+}
@@ -0,0 +1,29 @@
+package ru.otus.example.mongoDbDemo.repositories;
+
+import lombok.val;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import ru.otus.example.mongoDbDemo.model.Knowledge;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DisplayName("TeacherRepository должен ")
+class TeacherRepositoryTest extends AbstractRepositoryTest {
+
+    @Autowired
+    private TeacherRepository teacherRepository;
+
+    @DisplayName(" возвращать корректный список знаний преподавателя")
+    @Test
+    void shouldReturnCorrectKnowledgeList(){
+        val teachers = teacherRepository.findAll();
+        val teacher = teachers.get(0);
+        val experience = teacher.getExperience();
+        assertThat(experience).isNotNull().hasSize(3);
+
+        val actualExperience = teacherRepository.getTeacherExperienceById(teacher.getId());
+        assertThat(actualExperience).containsExactlyInAnyOrder(experience.toArray(new Knowledge[experience.size()]));
+
+    }
+}
@@ -0,0 +1,5 @@
+spring:
+  data:
+    mongodb:
+      port: 0
+      database: test