#40: Refactored the test environment

[morazow]

Fixes #40

[codecov]

Codecov Report

Merging #87 (b5e8de6) into main (cf83de2) will increase coverage by 18.74%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #87       +/-   ##
===========================================
+ Coverage   75.84%   94.59%   +18.74%     
===========================================
  Files          11       10        -1     
  Lines         472      407       -65     
  Branches       65       53       -12     
===========================================
+ Hits          358      385       +27     
+ Misses        114       22       -92     

Impacted Files	Coverage Δ
...c/main/scala/com/exasol/spark/util/Converter.scala	92.30% <ø> (+89.02%)	⬆️
src/main/scala/com/exasol/spark/util/Types.scala	98.83% <100.00%> (+18.60%)	⬆️
src/main/scala/com/exasol/spark/ExasolWriter.scala	89.58% <0.00%> (+2.08%)	⬆️

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