将junit测试加载到不同的jvm

Question

我有TestColumnPrefixFilter来自Apache Hbase项目的名为TestColumnPrefixFilter junit测试用例。 在此测试用例中，有2个测试。 当我使用命令行使用maven运行此测试用例时：

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此测试用例分别运行这两个测试？ Maven或Java有什么选择吗？ 还是可以在不同的jvm中运行这两个测试？ 因为当我调用上面的命令行时，该测试用例被加载到单个jvm中，并且该jvm用于我不想要的两个测试。

我尝试了Maven的perTest选项，但是没有用

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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 * 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。 看起来这就是我要的东西。 但是，它在行家中不起作用。 如何找到Maven的相同设置？

Answer 1

是否可以在不同的jvm中运行这两个测试？

是的，Maven有一个reuseForks选项。 来自文档

指示是否可以重用分支的VM。 如果设置为“ false”，则为要执行的每个测试类创建一个新的VM。 如果设置为“ true”，将最多派生forkFork VM，然后将其重新用于执行所有测试。

默认值为true。

用户属性是：reuseForks。

您可以像这样在pom.xml中进行设置

<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

尝试以下配置

<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>