Improve test coverage 96% => 100%

[dbalabka]

We would like to improve our test coverage. The method \Dbalabka\Enumeration\Enumeration isn't covered with a test:

• https://coveralls.io/builds/25420440/source?filename=src/Enumeration.php#L39

Todo

Please add the new test into our test suite:

• https://github.com/dbalabka/php-enumeration/blob/master/tests/EnumerationTest.php