Scala、Scalatest 和 Maven 入门
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/12812458/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-10-22 04:36:44 来源:igfitidea点击:
Getting started with Scala, Scalatest, and Maven
提问by MrDrews
I created a new scala project with the following:
我使用以下内容创建了一个新的 Scala 项目：
mvn org.apache.maven.plugins:maven-archetype-plugin:2.2:generate
-DarchetypeGroupId=org.scala-tools.archetypes
-DarchetypeArtifactId=scala-archetype-simple
-DarchetypeVersion=1.3
-DgroupId=myGroup
-DartifactId=myProject
-Dversion=0.1.0
-DinteractiveMode=false
Which gives me the following POM:
这给了我以下 POM：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>myGroup</groupId>
<artifactId>myProject</artifactId>
<version>0.1.0</version>
<name>${project.artifactId}</name>
<description>My wonderfull scala app</description>
<inceptionYear>2010</inceptionYear>
<licenses>
<license>
<name>My License</name>
<url>http://....</url>
<distribution>repo</distribution>
</license>
</licenses>
<properties>
<maven.compiler.source>1.5</maven.compiler.source>
<maven.compiler.target>1.5</maven.compiler.target>
<encoding>UTF-8</encoding>
<scala.version>2.8.0</scala.version>
</properties>
<!--
<repositories>
<repository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</pluginRepository>
</pluginRepositories>
-->
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
<!-- Test -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.scala-tools.testing</groupId>
<artifactId>specs_${scala.version}</artifactId>
<version>1.6.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest</artifactId>
<version>1.2</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<version>2.15.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
<configuration>
<args>
<arg>-make:transitive</arg>
<arg>-dependencyfile</arg>
<arg>${project.build.directory}/.scala_dependencies</arg>
</args>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.6</version>
<configuration>
<useFile>false</useFile>
<disableXmlReport>true</disableXmlReport>
<!-- If you have classpath issue like NoDefClassError,... -->
<!-- useManifestOnlyJar>false</useManifestOnlyJar -->
<includes>
<include>**/*Test.*</include>
<include>**/*Suite.*</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>
</project>
I can run mvn testand the sample tests run successfully. I'd like to use the most recent version of scala (I downloaded / installed 2.9.2...), but the most recent version of the org.scala-tools.testing scala_VERSION dependency seems to be 2.9.1. I made the following changes in my POM:
我可以运行mvn test并且示例测试成功运行。我想使用最新版本的 scala（我下载/安装了 2.9.2...），但org.scala-tools.testing scala_VERSION 依赖项的最新版本似乎是 2.9.1。我在 POM 中进行了以下更改：
<scala.version>2.9.1</scala.version>
and
和
<dependency>
<groupId>org.scala-tools.testing</groupId>
<artifactId>specs_${scala.version}</artifactId>
<version>1.6.5</version>
<scope>test</scope>
</dependency>
Now, running mvn testgives
现在，跑步mvn test给
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running samples.ListSuite
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.674 sec <<< FAILURE!
initializationError(samples.ListSuite) Time elapsed: 0.003 sec <<< ERROR!
java.lang.ClassCastException: scala.collection.immutable.Set$EmptySet$ cannot be
cast to scala.collection.generic.Addable
at org.scalatest.FunSuite$class.test(FunSuite.scala:1039)
at samples.ListSuite.test(scalatest.scala:59)
at samples.ListSuite.<init>(scalatest.scala:61)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at org.scalatest.junit.JUnitRunner.<init>(JUnitRunner.scala:62)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:51)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:120)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:103)
at org.apache.maven.surefire.Surefire.run(Surefire.java:169)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)
Running samples.StackSuite
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.12 sec
Running samples.AppTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.001 sec
Results :
Tests in error:
initializationError(samples.ListSuite)
Tests run: 4, Failures: 0, Errors: 1, Skipped: 0
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.880s
[INFO] Finished at: Wed Oct 10 01:10:56 ADT 2012
[INFO] Final Memory: 9M/112M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.6:test (default-test) on project myProject: There are test failures.
[ERROR]
[ERROR] Please refer to C:\Dropbox\work\dev\scalasandbox\target\surefire-reports for the individual test results.
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
I presumably have some of the most simple tests possible (samples created by the maven archetype plugin), and bumping scala by a single minor version is breaking them? Should I just stick with scala 2.8 until the maven tools catch up?
我大概有一些最简单的测试（由 maven 原型插件创建的示例），并且通过单个次要版本撞击 Scala 是否会破坏它们？在 maven 工具赶上之前，我应该坚持使用 Scala 2.8 吗？
回答by Nikita Volkov
Your artifact is outdated.
您的工件已过时。
The latest version of Scala is 2.10. Currently ScalaTest is being distributed under different groupid and it supports the latest version of Scala. Here's the dependecy:
Scala 的最新版本是 2.10。目前 ScalaTest 分布在不同的 groupid 下，它支持最新版本的 Scala。这是依赖：
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest_2.10</artifactId>
<version>2.0.M5b</version>
<scope>test</scope>
</dependency>
You will also require a different plugin:
您还需要一个不同的插件：
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.1.0</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
You don't need to specify any repositories, since all those artifacts are being distributed with the central repo.
您不需要指定任何存储库，因为所有这些工件都与中央存储库一起分发。
Here's an example of a complete pomof a project depending on the Scala 2.10.
回答by Andrzej Jozwik
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.2.2</version>
