Fixes Maven build error(s)

Fixes Maven build error:
`[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.16:test (default-test) on project geekseek-domain-core: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.16:test failed: Illegal Unicode escape sequence near index 4`
`[ERROR] .*\unit\.*TestCase.*`