How to run all tests in a particular package with Maven?

I can find in the Maven docs where it shows how to run:

1. A single test
2. All tests in a single test class
3. All tests in classes matching a particular pattern

But how to run all the tests in a package? Is this possible?

I would prefer solutions that don't require modifying the pom.xml or code.

You could use a pattern as well, for example

 mvn '-Dtest=de.mypackage.*Test' test

runs all tests in classes from package de.mypackage ending on *Test.

[update 2017/12/18]:
Since this became the accepted answer, here's some further information:

• Maven uses the Maven Surefire plugin to execute tests.

• The syntax used above (qualified package name) requires Surefire version 2.19.1 or higher! Earlier versions require the use of path expressions, for example

  mvn -Dtest="de/mypackage/*Test" test
  

• I'm using quotes (` or ") to prevent the shell from performing pathname expansion, Maven doesn't require any quotes.

• A single test method can be exuted using the following syntax

  mvn -Dtest=MyUnitTest#testMethod test
  

• All tests from subpackages may be includes as well, in order to execute all tests in or beneath package de.mypackage.sub execute:

  mvn -Dtest="de/mypackage/sub/**" test
  

  or with Surefire 2.19.1 or higher

  mvn -Dtest="de.mypackage.sub.**" test
  

There are further possibilities like using regular expressions, see the official documentation of running a single test.

AFAIK there are no command line parameter for surefire:test to run tests in a specific package.

I use a configuration variable to achieve the same effect. A fragment of my pom.xml:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.7.2</version>
            <configuration>
                <includes>
                    <include>**/${testGroup}/*Test.java</include>
                </includes>
            </configuration>
        </plugin>
    </plugins>
</build>

Now if I want to run tests in a package named "com.example", I use the following command:

mvn test -DtestGroup=com/example