具有不同系统属性值的多个 Maven 插件执行

Question

我正在尝试使用名为testVar 的系统属性的不同值多次执行下面的插件。我的pom.xml 中有以下插件：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.14.1</version>
    <configuration>
        <skip>false</skip>
        <forkCount>1</forkCount>
        <threadCount>3</threadCount>
    </configuration>
    <executions>
        <execution>
            <id>before-run</id>
            <goals>
                <goal>test</goal>
            </goals>
            <configuration>
                <systemPropertyVariables>
                    <testVar>aaa</testVar>
                </systemPropertyVariables>
            </configuration>
        </execution>
        <execution>
            <id>main-run</id>
            <goals>
                <goal>test</goal>
            </goals>
            <configuration>
                <systemPropertyVariables>
                    <testVar>bbb</testVar>
                </systemPropertyVariables>
            </configuration>
        </execution>
    </executions>
</plugin>

我在运行System.getProperty("testVar") 时收到null。但是，当testVar 在插件级别声明时，我可以正确访问它。怎么了？

Answer 1

在 maven-surefire-plugin 的配置中有多个 execution 标签，即目标 test 在默认阶段执行多次 test。实际上，您的插件配置会导致 3 次测试执行：

1. default-test（由surefire自动触发，未设置自定义系统属性）
2. 运行前（在您的 POM、系统属性集中首先定义）
3. main-run（在您的 POM、系统属性集中定义为第二个）

mvn test 使用 Maven 3.5.4：

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.example.app.ExampleTest
getProperty:null
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.078 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO]
[INFO] --- maven-surefire-plugin:2.14.1:test (before-run) @ app ---
[INFO] ...

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.example.app.ExampleTest
getProperty:aaa
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.078 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO]
[INFO] --- maven-surefire-plugin:2.14.1:test (main-run) @ app ---
[INFO] ...

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.example.app.ExampleTest
getProperty:bbb
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.078 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

考虑覆盖default-test 执行以正确应用您的配置。示例：

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.14.1</version>
            <executions>
                <execution>
                    <id>before-run</id>
                    ...
                </execution>
                <execution>
                    <id>default-test</id>
                    ...
                </execution>
            </executions>