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

Question

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.