Split tests from index.js into separate files

[holgerd77]

Test cases in this libraries are all packed into one big test/index.js file. This makes it hard to work with the tests.

Tests should be broken to separate files analog to the module structure in the src folder to make it easier to work on specific functionality and have an overview on functionality coverage.

Would be nice to have this for continued work on #228, no strict precondition though (of course).

[ryanio]

Thanks for the issue, I’ll work on this today.

[evertonfraga]

This is a good opportunity to migrate the test runner to ts-node as well.

[ryanio]

This is a good opportunity to migrate the test runner to ts-node as well.

Sure great I can include that.