Create Inherited TestDatabaseAPI class with protected methods to test the private curl methods

[nedvedba]

The DatabaseAPI class is currently untestable because the methods are private, so a new class must be created to inherit DatabaseAPI to be able to call those private methods.

[JoshuaSBrown]

Acceptance

A Database test class is created in the DatabaseAPI unit test that inherits from DatabaseAPI class, the unit test runs and the protected methods are directly callable.