将 junit 测试加载到不同的 jvm

Question

我有来自 Apache Hbase 项目的名为 TestColumnPrefixFilter 的 junit 测试用例。在这个测试用例中，有 2 个测试。当我使用命令行使用 maven 运行这个测试用例时：

mvn test -Dtest=org.apache.hadoop.hbase.filter.TestColumnPrefixFilter

我得到这个结果：

Running org.apache.hadoop.hbase.filter.TestColumnPrefixFilter
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 3.585 seconds

我的问题是，有没有办法在不修改代码的情况下从这个测试用例中分别运行这两个测试？ maven或java有什么选择吗？或者是否可以在不同的 jvm 中运行这两个测试？因为当我调用上面的命令行时，这个测试用例被加载到一个 jvm 并且这个 jvm 用于我不想要的两个测试。

我尝试了 maven 的 perTest 选项，但它不起作用

Java 文件在下面

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
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 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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package org.apache.hadoop.hbase.filter;

import static org.junit.Assert.*;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.InternalScanner;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category(SmallTests.class)
public class TestColumnPrefixFilter {

  private final static HBaseTestingUtility TEST_UTIL = new
      HBaseTestingUtility();

  @Test
  public void testColumnPrefixFilter() throws IOException {
    String family = "Family";
    HTableDescriptor htd = new HTableDescriptor("TestColumnPrefixFilter");
    htd.addFamily(new HColumnDescriptor(family));
    HRegionInfo info = new HRegionInfo(htd.getName(), null, null, false);
    HRegion region = HRegion.createHRegion(info, TEST_UTIL.
      getDataTestDir(), TEST_UTIL.getConfiguration(), htd);
    try {
      List<String> rows = generateRandomWords(100, "row");
      List<String> columns = generateRandomWords(10000, "column");
      long maxTimestamp = 2;

      List<KeyValue> kvList = new ArrayList<KeyValue>();

      Map<String, List<KeyValue>> prefixMap = new HashMap<String,
          List<KeyValue>>();

      prefixMap.put("p", new ArrayList<KeyValue>());
      prefixMap.put("s", new ArrayList<KeyValue>());

      String valueString = "ValueString";

      for (String row: rows) {
        Put p = new Put(Bytes.toBytes(row));
        p.setWriteToWAL(false);
        for (String column: columns) {
          for (long timestamp = 1; timestamp <= maxTimestamp; timestamp++) {
            KeyValue kv = KeyValueTestUtil.create(row, family, column, timestamp,
                valueString);
            p.add(kv);
            kvList.add(kv);
            for (String s: prefixMap.keySet()) {
              if (column.startsWith(s)) {
                prefixMap.get(s).add(kv);
              }
            }
          }
        }
        region.put(p);
      }

      ColumnPrefixFilter filter;
      Scan scan = new Scan();
      scan.setMaxVersions();
      for (String s: prefixMap.keySet()) {
        filter = new ColumnPrefixFilter(Bytes.toBytes(s));

        scan.setFilter(filter);

        InternalScanner scanner = region.getScanner(scan);
        List<KeyValue> results = new ArrayList<KeyValue>();
        while(scanner.next(results));
        assertEquals(prefixMap.get(s).size(), results.size());
      }
    } finally {
      region.close();
      region.getLog().closeAndDelete();
    }

    region.close();
    region.getLog().closeAndDelete();
  }

  @Test
  public void testColumnPrefixFilterWithFilterList() throws IOException {
    String family = "Family";
    HTableDescriptor htd = new HTableDescriptor("TestColumnPrefixFilter");
    htd.addFamily(new HColumnDescriptor(family));
    HRegionInfo info = new HRegionInfo(htd.getName(), null, null, false);
    HRegion region = HRegion.createHRegion(info, TEST_UTIL.
      getDataTestDir(), TEST_UTIL.getConfiguration(), htd);
    try {
      List<String> rows = generateRandomWords(100, "row");
      List<String> columns = generateRandomWords(10000, "column");
      long maxTimestamp = 2;

      List<KeyValue> kvList = new ArrayList<KeyValue>();

      Map<String, List<KeyValue>> prefixMap = new HashMap<String,
          List<KeyValue>>();

      prefixMap.put("p", new ArrayList<KeyValue>());
      prefixMap.put("s", new ArrayList<KeyValue>());

      String valueString = "ValueString";

      for (String row: rows) {
        Put p = new Put(Bytes.toBytes(row));
        p.setWriteToWAL(false);
        for (String column: columns) {
          for (long timestamp = 1; timestamp <= maxTimestamp; timestamp++) {
            KeyValue kv = KeyValueTestUtil.create(row, family, column, timestamp,
                valueString);
            p.add(kv);
            kvList.add(kv);
            for (String s: prefixMap.keySet()) {
              if (column.startsWith(s)) {
                prefixMap.get(s).add(kv);
              }
            }
          }
        }
        region.put(p);
      }

      ColumnPrefixFilter filter;
      Scan scan = new Scan();
      scan.setMaxVersions();
      for (String s: prefixMap.keySet()) {
        filter = new ColumnPrefixFilter(Bytes.toBytes(s));

        //this is how this test differs from the one above
        FilterList filterList = new FilterList(FilterList.Operator.MUST_PASS_ALL);
        filterList.addFilter(filter);
        scan.setFilter(filterList);

        InternalScanner scanner = region.getScanner(scan);
        List<KeyValue> results = new ArrayList<KeyValue>();
        while(scanner.next(results));
        assertEquals(prefixMap.get(s).size(), results.size());
      }
    } finally {
      region.close();
      region.getLog().closeAndDelete();
    }

    region.close();
    region.getLog().closeAndDelete();
  }

  List<String> generateRandomWords(int numberOfWords, String suffix) {
    Set<String> wordSet = new HashSet<String>();
    for (int i = 0; i < numberOfWords; i++) {
      int lengthOfWords = (int) (Math.random()*2) + 1;
      char[] wordChar = new char[lengthOfWords];
      for (int j = 0; j < wordChar.length; j++) {
        wordChar[j] = (char) (Math.random() * 26 + 97);
      }
      String word;
      if (suffix == null) {
        word = new String(wordChar);
      } else {
        word = new String(wordChar) + suffix;
      }
      wordSet.add(word);
    }
    List<String> wordList = new ArrayList<String>(wordSet);
    return wordList;
  }

  @org.junit.Rule
  public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =
    new org.apache.hadoop.hbase.ResourceCheckerJUnitRule();
}

编辑：我发现了一些有用的东西。在 ant 中，forkmode 有一个名为“perBatch”的选项。看起来这就是我要找的东西。但是它在 Maven 中不起作用。如何找到 maven 的相同设置？

Answer 1

是否可以在不同的 jvm 中运行这 2 个测试？

是的，maven 有一个 reuseForks 的选项。来自文档

指示是否可以重复使用分叉的 VM。如果设置为“false”，则为每个要执行的测试类派生一个新的 VM。如果设置为“true”，最多 forkCount 个虚拟机将被分叉，然后重新用于执行所有测试。

默认值为：true。

用户属性是：reuseForks。

你可以像这样在 pom.xml 中设置它

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.16</version>
    <configuration>
        <reuseForks>false</reuseForks> <!-- This will make sure to spawn a fresh jvm for each test -->
    </configuration>
</plugin>

编辑

试试下面的配置

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-surefire-plugin</artifactId>
  <version>2.9</version>
  <configuration>
    <forkMode>always</forkMode> <!-- try with 'pertest' option as well -->
  </configuration>
</plugin>