Add database tests

[Rakambda]

Pull Request Etiquette

Checklist

• Tests have been added in relevant areas
• Corresponding changes made to the documentation (README.adoc)

Type of change

Internal change

Description

[codecov]

Codecov Report

Merging #272 (8770fa1) into develop (4352dff) will increase coverage by 5.85%.
The diff coverage is 69.23%.

@@              Coverage Diff              @@
##             develop     #272      +/-   ##
=============================================
+ Coverage      83.09%   88.95%   +5.85%     
- Complexity       864      892      +28     
=============================================
  Files            173      173              
  Lines           2644     2652       +8     
  Branches         183      185       +2     
=============================================
+ Hits            2197     2359     +162     
+ Misses           404      244     -160     
- Partials          43       49       +6     

Flag	Coverage Δ
unittests-miner	89.51% <69.23%> (+5.96%)	⬆️
unittests-viewer	58.33% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...nelpointsminer/miner/database/MariaDBDatabase.java	0.00% <0.00%> (ø)
...hannelpointsminer/miner/database/NoOpDatabase.java	7.14% <0.00%> (ø)
...hannelpointsminer/miner/database/BaseDatabase.java	92.62% <94.87%> (+92.00%)	⬆️
...nnelpointsminer/miner/database/SQLiteDatabase.java	100.00% <100.00%> (+100.00%)	⬆️
...channelpointsminer/miner/factory/MinerFactory.java	100.00% <100.00%> (ø)
...intsminer/miner/database/converter/Converters.java	92.85% <0.00%> (+92.85%)	⬆️

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