Tests stuck on Configuring TestNG with: TestNG652Configurator - maven

Question

I have some TestNG tests in my project running alongside of jUnit tests. Everyone coexists peacefully and stuff runs as expected, until one day instead of working all the time things changed to working some of the time.
When running mvn clean install tests get to the point of
Configuring TestNG with: TestNG652Configurator
and gets stuck. Nothing seems to happen since.
When running mvn -X clean install tests get to the exact same point without issues (no errors on top) and refuses to move further.
I am using
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.8</version>
</dependency>
and
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
What can be going on here please?

Answer 1

I've never seen Surefire (the plugin that runs the tests) run tests from both JUnit and TestNG out-of-the-box, although it's supposed to do it.
You can force surefire to run both JUnit and TestNG by forcing the providers as explained here. For example, the following will force TestNG and JUnit 4.7
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.13</version>
<dependencies>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-junit47</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-testng</artifactId>
<version>2.13</version>
</dependency>
</dependencies>
</plugin>
Another thing that might influence the result is if you have configured TestNG to run some test groups
.