Measuring the coverage of your tests

package org.acme.testcoverage;

import jakarta.inject.Inject;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;

@Path("/hello")
public class GreetingResource {

    private final GreetingService service;

    @Inject
    public GreetingResource(GreetingService service) {
        this.service = service;
    }

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    @Path("/greeting/{name}")
    public String greeting(String name) {
        return service.greeting(name);
    }

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String hello() {
        return "hello";
    }
}

package org.acme.testcoverage;

import jakarta.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class GreetingService {

    public String greeting(String name) {
        return "hello " + name;
    }

}

package org.acme.testcoverage;

import io.quarkus.test.junit.QuarkusTest;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Tag;

import java.util.UUID;

import static io.restassured.RestAssured.given;
import static org.hamcrest.CoreMatchers.is;

@QuarkusTest
public class GreetingResourceTest {

    @Test
    public void testHelloEndpoint() {
        given()
          .when().get("/hello")
          .then()
             .statusCode(200)
             .body(is("hello"));
    }

    @Test
    public void testGreetingEndpoint() {
        String uuid = UUID.randomUUID().toString();
        given()
          .pathParam("name", uuid)
          .when().get("/hello/greeting/{name}")
          .then()
            .statusCode(200)
            .body(is("hello " + uuid));
    }
}

<dependency>
  <groupId>io.quarkus</groupId>
  <artifactId>quarkus-jacoco</artifactId>
  <scope>test</scope>
</dependency>

testImplementation("io.quarkus:quarkus-jacoco")

<plugin>
  <artifactId>maven-surefire-plugin</artifactId>
  <configuration>
    <systemPropertyVariables>
      <quarkus.jacoco.data-file>${maven.multiModuleProjectDirectory}/target/jacoco.exec</quarkus.jacoco.data-file>
      <quarkus.jacoco.reuse-data-file>true</quarkus.jacoco.reuse-data-file>
      <quarkus.jacoco.report-location>${maven.multiModuleProjectDirectory}/target/coverage</quarkus.jacoco.report-location>
    </systemPropertyVariables>
  </configuration>
</plugin

jacocoTestCoverageVerification {
    afterEvaluate { 1
        classDirectories.setFrom(files(classDirectories.files.collect { 2
            fileTree(dir: it, exclude: [
                    "org/example/package/**/*" 3
            ])
        }))
    }
}