Clean up old generator test
Refactored existing tests
Renamed generator unit tests
Code cleanup for existing generator unit tests
Adds generator column unit tests
Adds generator constraint unit tests
Adds generator data unit tests
Adds generator index unit tests
Adds generator sequence unit tests
Adds generator SQL Server clustering unit tests
Adds generator table unit tests
Assign generator unit tests to base classes
Merge pull request #416 from matthewdunsdon/RefactorGeneratorTests

Refactor generator tests