ant - 使用 Cobertura 进行单元测试很慢

Question

我最近将 Cobertura 集成到我的 Ant 构建脚本中，我想知道我是否做对了，因为它大大减慢了运行单元测试所需的时间。

这是一个示例控制台输出:

...
[junit] Running gov.nyc.doitt.gis.webmap.strategy.markup.ViewportDeterminingMarkupStrategyTest
[junit] Tests run: 5, Failures: 0, Errors: 0, Time elapsed: 0.38 sec
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 282 classes.
[junit] Cobertura: Saved information on 282 classes.
[junit] Running gov.nyc.doitt.gis.webmap.strategy.markup.VisibleFeatureTypesMarkupInfoTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 0.434 sec
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 282 classes.
[junit] Cobertura: Saved information on 282 classes.
[junit] Running gov.nyc.doitt.gis.webmap.strategy.markup.basemap.BasemapByViewportStrategyTest
[junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 2.016 sec
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 282 classes.
[junit] Cobertura: Saved information on 282 classes.
[junit] Running gov.nyc.doitt.gis.webmap.strategy.markup.basemap.BasemapByZoomLevelAndCenterPointStrategyTest
[junit] Tests run: 4, Failures: 0, Errors: 0, Time elapsed: 1.853 sec
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 282 classes.
[junit] Cobertura: Saved information on 282 classes.
...

每次试运行后，Cobertura 都说:

[junit] Cobertura: Loaded information on 282 classes.
[junit] Cobertura: Saved information on 282 classes.
...

这是我的 Ant 构建脚本中的单元测试任务:

    <target name="unit-test" depends="compile-unit-test">
    <delete dir="${reports.xml.dir}" />
    <delete dir="${reports.html.dir}" />
    <mkdir dir="${reports.xml.dir}" />
    <mkdir dir="${reports.html.dir}" />

    <junit fork="yes" dir="${basedir}" failureProperty="test.failed" printsummary="on">
        <!--
                Note the classpath order: instrumented classes are before the
                original (uninstrumented) classes.  This is important.
            -->
        <classpath location="${instrumented.dir}" />
        <classpath refid="test-classpath" />

        <formatter type="xml" />
        <test name="${testcase}" todir="${reports.xml.dir}" if="testcase" />
        <batchtest todir="${reports.xml.dir}" unless="testcase">
            <fileset dir="TestSource">
                <include name="**/*Test.java" />
                <exclude name="**/XmlTest.java" />
                <exclude name="**/ElectedOfficialTest.java" />
                <exclude name="**/ThematicManagerFixturesTest.java" />
            </fileset>
        </batchtest>
    </junit>
</target>

我的设置和输出看起来正确吗？单元测试在单独运行时需要 2.234 秒并且使用 Cobertura 在构建脚本中运行时需要 3 分钟是否正常？

Answer 1

来自 cobertura-anttask reference :

For this same reason, if you're using ant 1.6.2 or higher then you might want to set forkmode="once" This will cause only one JVM to be started for all your JUnit tests, and will reduce the overhead of Cobertura reading/writing the coverage data file each time a JVM starts/stops.

(重点是我的。)