Unit test samples

[airleks]

This pull request is sample of unit test cases that we plan to contribute in order to raise the overall coverage to 80%. Code coverage is measured using Intellij IDEA. This pull request increases code coverage of library from 0% to 15%.

Metric | Before | After
Coverage % | 0% | 15%
Lines Covered | 0 | 45
Total Lines | 291 | 291
Please let me know if you have any questions.

Alexey Syrtsev
DevFactory - Code Quality Team

[airleks]

Greetings @alexec. Circleci verification failed on unauthorized plugin deployment attempt. Is it ok for PR or there is a way to fix it?
The circleci error message is below

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.8.1:deploy (default-deploy) on project docker-maven-plugin: Failed to deploy artifacts: Could not transfer artifact com.alexecollins.docker:docker-maven-plugin:jar:2.11.10-20160128.101200-4 from/to sonatype-nexus-snapshots (https://oss.sonatype.org/content/repositories/snapshots/): Failed to transfer file: https://oss.sonatype.org/content/repositories/snapshots/com/alexecollins/docker/docker-maven-plugin/2.11.10-SNAPSHOT/docker-maven-plugin-2.11.10-20160128.101200-4.jar. Return code is: 401, ReasonPhrase: Unauthorized. -> [Help 1]

[alexec]

Great stuff.