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测量你的测试的覆盖率

Learn how to measure the test coverage of your application. This guide covers:

  • Measuring the coverage of your Unit Tests

  • Measuring the coverage of your Integration Tests

  • Separating the execution of your Unit Tests and Integration Tests

  • Consolidating the coverage for all your tests

Please note that code coverage is not supported in native mode.

1. 先决条件

完成这个指南,你需要:

  • 大概15分钟

  • 编辑器

  • JDK 17+ installed with JAVA_HOME configured appropriately

  • Apache Maven 3.9.8

  • 如果你愿意的话,还可以选择使用Quarkus CLI

  • 如果你想构建原生可执行程序,可以选择安装Mandrel或者GraalVM,并正确配置(或者使用Docker在容器中进行构建)

  • Having completed the Testing your application guide

2. 应用结构

The application built in this guide is just a Jakarta REST endpoint (hello world) that relies on dependency injection to use a service. The service will be tested with JUnit 5 and the endpoint will be annotated via a @QuarkusTest annotation.

3. 解决方案

We recommend that you follow the instructions in the next sections and create the application step by step. However, you can go right to the completed example. Clone the Git repository: git clone https://github.com/quarkusio/quarkus-quickstarts.git, or download an archive.

The solution is located in the tests-with-coverage-quickstart directory.

4. Starting from a simple project and two tests

Let’s start from an empty application created with the Quarkus Maven plugin:

CLI
quarkus create app org.acme:tests-with-coverage-quickstart \
    --extension='rest' \
    --no-code
cd tests-with-coverage-quickstart

创建Grade项目,请添加 --gradle 或者 --gradle-kotlin-dsl 参数。

For more information about how to install and use the Quarkus CLI, see the Quarkus CLI guide.

Maven
mvn io.quarkus.platform:quarkus-maven-plugin:3.15.1:create \
    -DprojectGroupId=org.acme \
    -DprojectArtifactId=tests-with-coverage-quickstart \
    -Dextensions='rest' \
    -DnoCode
cd tests-with-coverage-quickstart

创建Grade项目,请添加 -DbuildTool=gradle 或者 -DbuildTool=gradle-kotlin-dsl 参数。

For Windows users:

  • If using cmd, (don’t use backward slash \ and put everything on the same line)

  • If using Powershell, wrap -D parameters in double quotes e.g. "-DprojectArtifactId=tests-with-coverage-quickstart"

Now we’ll be adding all the elements necessary to have an application that is properly covered with tests.

First, a Jakarta REST resource serving a hello endpoint:

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";
    }
}

This endpoint uses a greeting service:

package org.acme.testcoverage;

import jakarta.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class GreetingService {

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

}

The project will also need a test:

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));
    }
}

5. Setting up JaCoCo

Now we need to add JaCoCo to our project. To do this we need to add the following to the build file:

pom.xml
<dependency>
  <groupId>io.quarkus</groupId>
  <artifactId>quarkus-jacoco</artifactId>
  <scope>test</scope>
</dependency>
build.gradle
testImplementation("io.quarkus:quarkus-jacoco")

This Quarkus extension takes care of everything that would usually be done via the JaCoCo Maven plugin, so no additional config is required.

Using both the extension and the plugin requires special configuration, if you add both you will get lots of errors about classes already being instrumented. The configuration needed is detailed below.

6. Working with multi-module projects

Up until 3.2, data-file and report-location were always relative to the module’s build output directory, which prevented from working with multi-module projects where you want to aggregate all coverages into a single parent directory. Starting in 3.3, specifying a data-file or report-location will assume the path as is. Here is an example on how to set up the surefire plugin:

<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

7. Running the tests with coverage

Run mvn verify, the tests will be run and the results will end up in target/jacoco-reports. This is all that is needed, the quarkus-jacoco extension allows JaCoCo to just work out of the box.

There are some config options that affect this:

Configuration property fixed at build time - All other configuration properties are overridable at runtime

Configuration property

类型

默认

Whether or not the jacoco extension is enabled.

Environment variable: QUARKUS_JACOCO_ENABLED

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boolean

true

The jacoco data file. The path can be relative (to the module) or absolute.

Environment variable: QUARKUS_JACOCO_DATA_FILE

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string

target/jacoco-quarkus.exec

Whether to reuse (true) or delete (false) the jacoco data file on each run.

Environment variable: QUARKUS_JACOCO_REUSE_DATA_FILE

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boolean

false

If Quarkus should generate the Jacoco report

Environment variable: QUARKUS_JACOCO_REPORT

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boolean

true

Encoding of the generated reports.

Environment variable: QUARKUS_JACOCO_OUTPUT_ENCODING

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string

UTF-8

Name of the root node HTML report pages.

Environment variable: QUARKUS_JACOCO_TITLE

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string

${quarkus.application.name}

Footer text used in HTML report pages.

Environment variable: QUARKUS_JACOCO_FOOTER

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string

Encoding of the source files.

Environment variable: QUARKUS_JACOCO_SOURCE_ENCODING

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string

UTF-8

A list of class files to include in the report. May use wildcard characters (* and ?). When not specified everything will be included.

For instance:

  • **/fo/**/* targets all classes under fo and sub packages

  • **/bar/* targets all classes directly under bar

  • **/*BAR*.class targets classes that contain BAR in their name regardless of path

Environment variable: QUARKUS_JACOCO_INCLUDES

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list of string

**

A list of class files to exclude from the report. May use wildcard characters (* and ?). When not specified nothing will be excluded.

For instance:

  • **/fo/**/* targets all classes under fo and sub packages

  • **/bar/* targets all classes directly under bar

  • **/*BAR*.class targets classes that contain BAR in their name regardless of path

Environment variable: QUARKUS_JACOCO_EXCLUDES

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list of string

The location of the report files. The path can be relative (to the module) or absolute.

Environment variable: QUARKUS_JACOCO_REPORT_LOCATION

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string

target/jacoco-report

When working with a multi-module project, then for code coverage to work properly, the upstream modules need to be properly indexed.

8. Coverage for tests not using @QuarkusTest

The Quarkus automatic JaCoCo config will only work for tests that are annotated with @QuarkusTest. If you want to check the coverage of other tests as well then you will need to fall back to the JaCoCo maven plugin.

In addition to including the quarkus-jacoco extension in your pom.xml you will need the following config:

pom.xml
<project>
    <build>
        <plugins>
            ...
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>${jacoco.version}</version>
                <executions>
                   <execution>
                      <id>default-prepare-agent</id>
                      <goals>
                           <goal>prepare-agent</goal>
                      </goals>
                      <configuration>
                        <exclClassLoaders>*QuarkusClassLoader</exclClassLoaders>  (1)
                        <destFile>${project.build.directory}/jacoco-quarkus.exec</destFile>
                        <append>true</append>
                      </configuration>
                   </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>
1 This config tells it to ignore @QuarkusTest related classes, as they are loaded by QuarkusClassLoader
build.gradle
plugins {
    id 'jacoco' (1)
}

test {
    finalizedBy jacocoTestReport
    jacoco {
        excludeClassLoaders = ["*QuarkusClassLoader"] (2)
        destinationFile = layout.buildDirectory.file("jacoco-quarkus.exec").get().asFile (2)
    }
    jacocoTestReport.enabled = false (3)
}
1 Add the jacoco gradle plugin
2 This config tells it to ignore @QuarkusTest related classes, as they are loaded by QuarkusClassLoader
3 Set this config to false if you are also using the quarkus-jacoco extension and have at least one @QuarkusTest. The default jacocoTestReport task can be skipped since quarkus-jacoco will generate the combined report of regular unit tests and @QuarkusTest classes since the execution data is recorded in the same file.
This config will only work if at least one @QuarkusTest is being run. If you are not using @QuarkusTest then you can simply use the JaCoCo plugin in the standard manner with no additional config.

8.1. Coverage for Integration Tests

To get code coverage data from integration tests, the following requirements need to be met:

  • The built artifact is a jar (and not a container or native binary).

  • JaCoCo needs to be configured in your build tool.

  • The application must have been built with quarkus.package.write-transformed-bytecode-to-build-output set to true

Setting quarkus.package.write-transformed-bytecode-to-build-output=true should be done with caution and only if subsequent builds are done in a clean environment - i.e. the build tool’s output directory has been completely cleaned.

In the pom.xml, you can add the following plugin configuration for JaCoCo. This will append integration test data into the same destination file as unit tests, re-build the JaCoCo report after the integration tests are complete, and thus produce a comprehensive code-coverage report.

<build>
    ...
    <plugins>
        ...
        <plugin>
            <groupId>org.jacoco</groupId>
            <artifactId>jacoco-maven-plugin</artifactId>
            <version>${jacoco.version}</version>
            <executions>
                ... (1)

                <execution>
                    <id>default-prepare-agent-integration</id>
                    <goals>
                        <goal>prepare-agent-integration</goal>
                    </goals>
                    <configuration>
                        <destFile>${project.build.directory}/jacoco-quarkus.exec</destFile>
                        <append>true</append>
                    </configuration>
                </execution>
                <execution>
                    <id>report</id>
                    <phase>post-integration-test</phase>
                    <goals>
                        <goal>report</goal>
                    </goals>
                    <configuration>
                        <dataFile>${project.build.directory}/jacoco-quarkus.exec</dataFile>
                        <outputDirectory>${project.build.directory}/jacoco-report</outputDirectory>
                    </configuration>
                </execution>
            </executions>
        </plugin>
        ...
    </plugins>
    ...
</build>
1 All executions should be in the same <plugin> definition so make sure you concatenate all of them.

In order to run the integration tests as a jar with the JaCoCo agent, add the following to your pom.xml.

<build>
    ...
    <plugins>
        ...
        <plugin>
            <artifactId>maven-failsafe-plugin</artifactId>
            <version>${surefire-plugin.version}</version>
            <executions>
                <execution>
                    <goals>
                        <goal>integration-test</goal>
                        <goal>verify</goal>
                    </goals>
                    <configuration>
                        <systemPropertyVariables>
                            <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
                            <maven.home>${maven.home}</maven.home>
                            <quarkus.test.arg-line>${argLine}</quarkus.test.arg-line>
                        </systemPropertyVariables>
                    </configuration>
                </execution>
            </executions>
        </plugin>
        ...
    </plugins>
    ...
</build>
Sharing the same value for quarkus.test.arg-line might break integration test runs that test different types of Quarkus artifacts. In such cases, the use of Maven profiles is advised.

9. Setting coverage thresholds

You can set thresholds for code coverage using the JaCoCo Maven plugin. Note the element <dataFile>${project.build.directory}/jacoco-quarkus.exec</dataFile>. You must set it matching your choice for quarkus.jacoco.data-file.

pom.xml
<build>
    ...
    <plugins>
        ...
        <plugin>
            <groupId>org.jacoco</groupId>
            <artifactId>jacoco-maven-plugin</artifactId>
            <version>${jacoco.version}</version>
            <executions>
                ... (1)

                <execution>
                    <id>jacoco-check</id>
                    <goals>
                        <goal>check</goal>
                    </goals>
                    <phase>post-integration-test</phase>
                    <configuration>
                        <dataFile>${project.build.directory}/jacoco-quarkus.exec</dataFile>
                        <rules>
                            <rule>
                                <element>BUNDLE</element>
                                <limits>
                                    <limit>
                                        <counter>LINE</counter>
                                        <value>COVEREDRATIO</value>
                                        <minimum>0.8</minimum>
                                    </limit>
                                    <limit>
                                        <counter>BRANCH</counter>
                                        <value>COVEREDRATIO</value>
                                        <minimum>0.72</minimum>
                                    </limit>
                                </limits>
                            </rule>
                        </rules>
                    </configuration>
                </execution>
            </executions>
        </plugin>
        ...
    </plugins>
    ...
</build>
1 All executions should be in the same <plugin> definition so make sure you concatenate all of them.
build.gradle
jacocoTestCoverageVerification {
    executionData.setFrom("$project.buildDir/jacoco-quarkus.exec")
    violationRules {
        rule {
            limit {
                counter = 'INSTRUCTION'
                value = 'COVEREDRATIO'
                minimum = 0.80
            }
            limit {
                counter = 'BRANCH'
                value = 'COVEREDRATIO'
                minimum = 0.72
            }
        }
    }
}
check.dependsOn jacocoTestCoverageVerification

Excluding classes from the verification task can be configured as following:

jacocoTestCoverageVerification {
    afterEvaluate { (1)
        classDirectories.setFrom(files(classDirectories.files.collect { (2)
            fileTree(dir: it, exclude: [
                    "org/example/package/**/*" (3)
            ])
        }))
    }
}
1 classDirectories needs to be read after evaluation phase in Gradle
2 Currently, there is a bug in Gradle JaCoCo which requires the excludes to be specified in this manner - https://github.com/gradle/gradle/issues/14760. Once this issue is fixed, excludes
3 Exclude all classes in org/example/package package

10. 解决方案

You now have all the information you need to study the coverage of your tests! But remember, some code that is not covered is certainly not well tested. But some code that is covered is not necessarily well tested. Make sure to write good tests!

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