maven test on scala code return successful build but There are no tests to run - scala

Question

I have the problem using mvn test to run the test code in my maven scala code. Here are the settings:
.
├── pom.xml
├── run
└── src
├── main
│   └── scala
│   └── com
│   └── myCompany
│   └── scala
│   └── MaxPrice.scala
├── resources
│   └── JCudaMultiplyBy2.ptx
└── test
├── resources
│   └── JCudaMultiplyBy2.ptx
└── scala
└── MyTest.scala
JCudaMultiplyBy2.ptx is the file will be used in MyTest.scala.
Here is my pom.xml:
<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>com.myCompany.scala</groupId>
<artifactId>sparkExample</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<scala.version>2.10.5</scala.version> <!-- Well we can use 2.11 scala, but scala-maven-plugin may have issue with that, so if to use mvn -q scala:run, then keep 2.10 scala, otherwise, have to spark-submit -->
</properties>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.4</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<version>2.11</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.jcuda</groupId>
<artifactId>jcuda</artifactId>
<version>0.8.0</version>
</dependency>
<dependency>
<groupId>org.jcuda</groupId>
<artifactId>jcublas</artifactId>
<version>0.8.0</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
<configuration>
<scalaVersion>${scala.version}</scalaVersion>
<args>
<!--arg>-target:jvm-1.5</arg-->
</args>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.8.1</version>
<configuration>
<includes>
<include>**/*Spec.class</include>
<include>**/*Test.class</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>
<reporting>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<configuration>
<scalaVersion>${scala.version}</scalaVersion>
</configuration>
</plugin>
</plugins>
</reporting>
</project>
The MyTest.scala code is the same as the MaxPrice.scala code, and if I run mvn compile and then run mvn -q scala:run -DmainClass=com.myCompany.scala.MaxPrice -DaddArgs="local[*]", it works perfectly. Now I change the Object name of MaxPrice.scala into MyTest and also its file name into MyTest.scala. Putting MyTest.scala under src/test/scala and run mvn test, it doesn't work and give this results:
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.myCompany.scala:sparkExample:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.scala-tools:maven-scala-plugin is missing. # line 48, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building sparkExample 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) # sparkExample ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/yuxin/OwensGroup/MavenPract/maven-sparkJcublas/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.2:compile (default-compile) # sparkExample ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-scala-plugin:2.15.2:compile (default) # sparkExample ---
[INFO] Checking for multiple versions of scala
[WARNING] Expected all dependencies to require Scala version: 2.10.5
[WARNING] com.myCompany.scala:sparkExample:1.0-SNAPSHOT requires scala version: 2.10.5
[WARNING] com.twitter:chill_2.10:0.5.0 requires scala version: 2.10.4
[WARNING] Multiple versions of scala libraries detected!
[INFO] includes = [**/*.java,**/*.scala,]
[INFO] excludes = []
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) # sparkExample ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.2:testCompile (default-testCompile) # sparkExample ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-scala-plugin:2.15.2:testCompile (default) # sparkExample ---
[INFO] Checking for multiple versions of scala
[WARNING] Expected all dependencies to require Scala version: 2.10.5
[WARNING] com.myCompany.scala:sparkExample:1.0-SNAPSHOT requires scala version: 2.10.5
[WARNING] com.twitter:chill_2.10:0.5.0 requires scala version: 2.10.4
[WARNING] Multiple versions of scala libraries detected!
[INFO] includes = [**/*.java,**/*.scala,]
[INFO] excludes = []
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.8.1:test (default-test) # sparkExample ---
[INFO] Surefire report directory: /home/yuxin/OwensGroup/MavenPract/maven-sparkJcublas/target/surefire-reports
-------------------------------------------------------
T E S T S
-------------------------------------------------------
There are no tests to run.
Results :
Tests run: 0, Failures: 0, Errors: 0, Skipped: 0
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.202 s
[INFO] Finished at: 2017-03-30T14:52:29-07:00
[INFO] Final Memory: 25M/592M
[INFO] ------------------------------------------------------------------------
Also if I run mvn test -Dtest=MyTest, it still gives the same result: no tests to run.
Anyone has an idea? I have search a lot but couldn't find the answer, help!

Answer 1

Apparently from the author you should use scala-maven-plugin instead of maven-scala-plugin (see here).
More importantly, to run scala tests, according to the (almighty) documentation, you should disable the surefire plugin:
To use the ScalaTest Maven plugin, you need to disable SureFire and
enable ScalaTest.
Add in the configuration section of the surefire plugin:
<skipTests>true</skipTests>