The sidoaf snapshot and release files are in the Sourceforge files section for direct download.
The dependency entry for sidaof-tester is:
<dependency>
<groupId>net.sf.sidaof</groupId>
<artifactId>sidaof-tester</artifactId>
<version>${sidaoftesterVersion}</version>
<scope>test</scope>
</dependency>
Of course, set the correct version - either set a property or edit it directly.
sidaof-tester releases are synced with Maven Central. Just add a dependency as above.
If you want to use the sidaof snapshot or release SourceForge Maven repository, use the following:
<repository> <id>repo.sf.sidaof.releases</id> <name>sidaof Maven release repo</name> <url>http://downloads.sourceforge.net/project/sidaof/releases</url> </repository>
<repository> <id>repo.sf.sidaof.snapshots</id> <name>sidaof Maven snapshot repo</name> <url>http://downloads.sourceforge.net/project/sidaof/snapshots</url> </repository>