运行JUnit @Test方法的子集


问题内容

我们正在使用JUnit
4进行测试:我们的类不是的子类TestCase,并且它们的公共方法带有注释@Test。一个文件有很多@Test方法。能够通过命令行从Ant运行它们的一个子集,就像JUnit
3的本食谱一样,这将是很好的:

ant runtest -Dtest=MyTest -Dtests=testFoo,testBar

http://today.java.net/pub/a/today/2003/09/12/individual-test-
cases.html

我一直在尝试用Java反射等方法来实现此目的。由于似乎没有任何方法可以@Test在运行时“隐藏”
方法或删除其注释,因此唯一的选择似乎是使用ClassLoader的defineClass方法,这似乎相当困难。

PS在这种情况下正确的事情是将文件分割开,但是还有其他选择吗?

谢谢你的时间。


问题答案:

guerda的解决方案很好。这就是我最终要做的事情(这是我以前联系过的卢克·弗朗克食谱的混合物,还有我在网上看到的其他东西):

import org.junit.runner.manipulation.Filter;
import org.junit.runner.Description;

public final class AntCLFilter extends Filter {
    private static final String TEST_CASES = "tests";
    private static final String ANT_PROPERTY = "${tests}";
    private static final String DELIMITER = "\\,";
    private String[] testCaseNames;

    public AntCLFilter() {
        super();
        if (hasTestCases()) testCaseNames = getTestCaseNames();
    }

    public String describe() {
        return "Filters out all tests not explicitly named in a comma-delimited list in the system property 'tests'.";
    }

    public boolean shouldRun(Description d) {
        String displayName = d.getDisplayName();
        // cut off the method name:
        String testName = displayName.substring(0, displayName.indexOf('('));
        if (testCaseNames == null) return true;

        for (int i = 0; i < testCaseNames.length; i++)
            if (testName.equals(testCaseNames[i]))
                return true;
        return false;
    }

    /**
     * Check to see if the test cases property is set. Ignores Ant's
     * default setting for the property (or null to be on the safe side).
     **/
    public static boolean hasTestCases() {
        return
            System.getProperty( TEST_CASES ) == null ||
            System.getProperty( TEST_CASES ).equals( ANT_PROPERTY ) ?
            false : true;
    }

    /**
     * Create a List of String names of test cases specified in the
     * JVM property in comma-separated format.
     *
     * @return a List of String test case names
     *
     * @throws NullPointerException if the TEST_CASES property
     * isn't set
     **/
    private static String[] getTestCaseNames() {

        if ( System.getProperty( TEST_CASES ) == null ) {
            throw new NullPointerException( "Test case property is not set" );
        }

        String testCases = System.getProperty( TEST_CASES );
        String[] cases = testCases.split(DELIMITER);

        return cases;
    }
}

import org.junit.internal.runners.*;
import org.junit.runner.manipulation.Filter;
import org.junit.runner.manipulation.NoTestsRemainException;

public class FilteredRunner extends TestClassRunner {

    public FilteredRunner(Class<?> clazz) throws InitializationError {
        super(clazz);
        Filter f = new AntCLFilter();
        try {
            f.apply(this);
        } catch (NoTestsRemainException ex) {
            throw new RuntimeException(ex);
        }
    }
}

然后,我用以下注释了测试类:

@RunWith(FilteredRunner.class)
public class MyTest {

并将以下内容放入我的ant buildfile中:

<target name="runtest"
        description="Runs the test you specify on the command line with -Dtest="
        depends="compile, ensure-test-name">
    <junit printsummary="withOutAndErr" fork="yes">
        <sysproperty key="tests" value="${tests}" />
        <classpath refid="classpath" />
        <formatter type="plain" usefile="false" />
        <batchtest>
            <fileset dir="${src}">
                <include name="**/${test}.java" />
            </fileset>
        </batchtest>
    </junit>
</target>

关键行是sysproperty标签。

现在我可以跑步

ant runtest -Dtest=MyTest -Dtests=testFoo,testBar

如预期的。这适用于JUnit 4.1
—在4.4中是JUnit4ClassRunner的子类,在4.5及更高版本中是BlockJUnit4ClassRunner的子类。