Make sure that you have the following dependencies in your pom.xml file:

<!--Testing-->
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.skyscreamer</groupId>
  <artifactId>jsonassert</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>io.projectreactor</groupId>
  <artifactId>reactor-test</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-test</artifactId>
  <scope>test</scope>
</dependency>

As you can see, in the preceding code, all of the dependencies can be scoped for testing purposes.