Better tests are needed

[illabo]

All the checks now are performed within a single method in Example/Tests/Tests.swift. This test may be considered integration testing as it tests functioning of the library within example app.

• Tests needs to be enhanced and at least all the current test cases in Example/Tests/Tests.swift should be moved to separate methods.
• Some unit tests better be added to IIDadata/Tests/IIDadataTests/IIDadataTests.swift to validate the correctness of the library internals.