I developed some Mockito tests using Jenkins pipeline and will see the report through SonarQube.
So far this is what I typed in the Jenkins script:
sh '  mvn sonar:sonar -Dsonar.sources=src/main/java -Dsonar.css.node=. 
-Dsonar.java.binaries=. -Dsonar.host.url=http://192.168.2.2:9000/ 
-Dsonar.login=admin   -Dsonar.password=sonar -Dsonar.jacoco.reportPath=build/reports/jacoco.xml'
I've also added this command to the stage before creating the artifact to clean the project (so it ignores at first tests so it doesn't generate the exception for ConnectionNeeded)
 sh 'mvn package -Dmaven.test.skip=true -P test-coverage'
I get an exception and the final stage (I believe this is because I don't have a database on my Centos machine)

[ERROR] Tests run: 11, Failures: 0, Errors: 11, Skipped: 0
and the Coverage percentage on SonarQube is still 0% and the number of lines is not changing after adding my tests.
    <?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 https://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>2.5.3</version>
            <relativePath /> <!-- lookup parent from repository -->
        </parent>
        <groupId>uk.un.ts</groupId>
        <artifactId>proj</artifactId>
        <version>1.0</version>
        <name>achat</name>
        <description>Projet pour le module DevOps</description>
        <properties>
            <java.version>1.8</java.version>
            <maven-jar-plugin.version>3.1.0</maven-jar-plugin.version>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
             <jacoco.version>0.8.6</jacoco.version>
        <sonar.java.coveragePlugin>jacoco</sonar.java.coveragePlugin>
        <sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
        <sonar.jacoco.reportPath>${project.basedir}/../target/jacoco.exec</sonar.jacoco.reportPath>
        <sonar.language>java</sonar.language>
        </properties>
    
        <distributionManagement>
            <snapshotRepository>
                <id>nexus-snapshots</id>
                <url>http://192.168.2.2:8081/repository/maven-snapshots/</url>
            </snapshotRepository>
            <repository>
                <id>nexus-releases</id>
                <url>http://192.168.2.2:8081/repository/maven-releases/ </url>
            </repository>
    
    
        </distributionManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-jpa</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-boot-starter</artifactId>
                <version>3.0.0</version>
            </dependency>
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
                <version>3.0.0</version>
            </dependency>
            <dependency>
                <groupId>org.junit.jupiter</groupId>
                <artifactId>junit-jupiter</artifactId>
                <version>5.9.1</version>
            </dependency>
    <dependency>
        <groupId>org.jacoco</groupId> 
        <artifactId>jacoco-maven-plugin</artifactId>
        <version>0.8.6</version>
    </dependency>
        </dependencies>
        <build>
            <plugins>
    <plugin>
        <groupId>org.jacoco</groupId>
        <artifactId>jacoco-maven-plugin</artifactId>
        <version>${jacoco.version}</version>
        <executions>
            <execution>
                <id>jacoco-initialize</id>
                <goals>
                    <goal>prepare-agent</goal>
                </goals>
            </execution>
            <execution>
                <id>jacoco-site</id>
                <phase>package</phase>
                <goals>
                    <goal>report</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
    
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>${maven-deploy-plugin.version}</version>
                    <configuration>
                        <skip>true</skip>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.sonatype.plugins</groupId>
                    <artifactId>nexus-staging-maven-plugin</artifactId>
                    <executions>
                        <execution>
                            <id>default-deploy</id>
                            <phase>deploy</phase>
                            <goals>
                                <goal>deploy</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <serverId>nexus</serverId>
                        <nexusUrl>http://192.168.2.2:8081/</nexusUrl>
                        <skipStaging>true</skipStaging>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>org.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>


 
     
    