如何通过单个java_test()规则在Bazel中运行所有测试? [英] How to run all tests in Bazel from a single java_test() rule?

问题描述

我要在Bazel中添加测试，但是我不想为每个测试文件编写一个测试规则.但是，每个测试规则都需要一个test_class-正在运行的测试类，因此，没有简单的方法就可以使用单个java_test规则来运行所有测试.是否不需要我指定test_class并立即运行所有测试的解决方法?

I am adding tests in Bazel, but I don't want to write a test rule for every single test file. However, each test rule requires a test_class - the test class that is being ran, so there is no easy way to just run all tests with a single java_test rule. Is there a work around for where I wouldn't need to specify a test_class and just run all tests at once?

推荐答案

您可以编写一个JUnit测试套件类，该类将运行您的其他测试.例如，如果您具有测试类Test1.java和Test2.java，则可以执行以下操作:

You can write a JUnit test suite class, which will run your other tests. For example, if you have test classes Test1.java and Test2.java, you can do something like this:

AllTests.java

AllTests.java

import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import org.junit.runners.Suite.SuiteClasses;

@RunWith(Suite.class)
@SuiteClasses({
    Test1.class,
    Test2.class
})
public class AllTests {}

已构建

java_test(
    name = "AllTests",
    test_class = "AllTests",
    srcs = [
        "AllTests.java",
        "Test1.java",
        "Test2.java",
    ],
)

编辑以回应评论:

如果您不想在测试套件中指定测试类名称，则可以通过反射进行某些操作.下面的示例假定所有测试都在"com.foo"包中，并且所有测试都是java_test规则的srcs:

If you don't want to specify the test class names in your test suite, you could do something via reflection. The following example assumes all your tests are in the "com.foo" package and that all the tests are srcs of the java_test rule:

package com.foo;

import java.io.File;
import java.io.IOException;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.Set;
import java.util.TreeSet;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import junit.framework.JUnit4TestAdapter;
import junit.framework.TestSuite;
import org.junit.runner.RunWith;

@RunWith(org.junit.runners.AllTests.class)
public class AllTests {
  public static TestSuite suite() throws IOException {
    TestSuite suite = new TestSuite();
    URLClassLoader classLoader = (URLClassLoader) Thread.currentThread().getContextClassLoader();
    // The first entry on the classpath contains the srcs from java_test
    findClassesInJar(new File(classLoader.getURLs()[0].getPath()))
        .stream()
        .map(c -> {
          try {
            return Class.forName(c);
          } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
          }
        })
        .filter(clazz -> !clazz.equals(AllTests.class))
        .map(JUnit4TestAdapter::new)
        .forEach(suite::addTest);
    return suite;
  }

  private static Set<String> findClassesInJar(File jarFile) {
    Set<String> classNames = new TreeSet<>();
    try {
      try (ZipFile zipFile = new ZipFile(jarFile)) {
        Enumeration<? extends ZipEntry> entries = zipFile.entries();
        while (entries.hasMoreElements()) {
          String entryName = entries.nextElement().getName();
          if (entryName.startsWith("com/foo") && entryName.endsWith(".class")) {
            int classNameEnd = entryName.length() - ".class".length();
            classNames.add(entryName.substring(0, classNameEnd).replace('/', '.'));
          }
        }
      }
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
    return classNames;
  }
}

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