Travis CI - Maven build - Tests are skipped by default - maven

Question

I observed that unit tests are skipped by default during travis-ci builds.
My travis config file
language: java
sudo: false
jdk:
- openjdk11
cache:
directories:
- "$HOME/.m2/repository"
- "$HOME/.sonar/cache"
addons:
sonarcloud:
organization: st-spring-samples
token:
secure: ${SONAR_TOKEN}
script:
- mvn org.jacoco:jacoco-maven-plugin:prepare-agent install sonar:sonar
My travis build output:
Can someone please let me know why travis-ci forces -DskipTests=true option in this case?

Answer 1

Was able to overcome the problem by making use of maven build profiles. Assembly plugin will be invoked only with an explicit build profile. So travis install dependencies phase doesn't kickoff assembly process, hence no assembly error.
<profiles>
<profile>
<id>assemble</id>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>io.spring.javaformat</groupId>
<artifactId>spring-javaformat-maven-plugin</artifactId>
<version>0.0.15</version>
<executions>
<execution>
<phase>package</phase>
<inherited>true</inherited>
<goals>
<goal>validate</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<finalName>${project.artifactId}-mocks-${project.version}</finalName>
<attach>false</attach>
<appendAssemblyId>false</appendAssemblyId>
<descriptors>
<descriptor>src/main/assembly/wiremock-assembly.xml</descriptor>
</descriptors>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<id>attach-mock-jar</id>
<phase>package</phase>
<goals>
<goal>attach-artifact</goal>
</goals>
<configuration>
<artifacts>
<artifact>
<file>target/${project.artifactId}-mocks-${project.version}.jar</file>
<type>jar</type>
<classifier>mocks</classifier>
</artifact>
</artifacts>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>io.spring.javaformat</groupId>
<artifactId>spring-javaformat-maven-plugin</artifactId>
<version>0.0.15</version>
<executions>
<execution>
<phase>package</phase>
<inherited>true</inherited>
<goals>
<goal>validate</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Full pom.xml can be found here
I am still interested to see if there is a better option available. If anyone knows one, please let me know.