The import org.springframework.boot.test cannot be resolved - spring

Question

I am currently working on a Spring application using SpringBoot. To manage depedencies of this project, I'm using Gradle.
I wanted to implement some tests but I got this error: "The import org.springframework.boot.test cannot be resolved".
Here is the code.
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
#RunWith(SpringRunner.class)
#SpringBootTest
class ClassTest {
#Test
public void contextLoads() {
}
}
And the content of the build.gradle
plugins {
id "com.moowork.gulp" version "1.2.0"rk.node" version "1.2.0"
id "org.springframework.boot" version "2.1.5.RELEASE"
id "java"
}
configurations {
developmentOnly
runtimeClasspath {
extendsFrom developmentOnly
}
compileOnly {
extendsFrom annotationProcessor
}
}
repositories {
mavenCentral()
}
test {
useJUnitPlatform()
}
dependencies {
implementation "org.springframework.boot:spring-boot-starter-web"
developmentOnly "org.springframework.boot:spring-boot-devtools"
testImplementation "org.springframework.boot:spring-boot-starter-test"
implementation "org.springframework.boot:spring-boot-starter-thymeleaf"
implementation "nz.net.ultraq.thymeleaf:thymeleaf-layout-dialect"
testCompile "org.junit.jupiter:junit-jupiter:5.4.2"
annotationProcessor "org.projectlombok:lombok"
implementation "org.projectlombok:lombok"
implementation "org.apache.commons:commons-csv:1.1"
implementation "org.apache.commons:commons-math3:3.0"
}
The simplified stack trace is the following:
java.lang.Error: Unresolved compilation problems:
The import org.springframework.boot.test cannot be resolved
The import org.springframework.test cannot be resolved
SpringRunner cannot be resolved to a type
Class<SpringRunner> cannot be resolved to a type
SpringBootTest cannot be resolved to a type
at climenvi.webapp.ClassTest.<init>(ClassTest.java:12)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
I have tried some solutions found already for this but nothing corrected the problem. Could you help me please ? Thank you for your help.