Fix Gradle task on Linux and add integration test.

[vanniktech]

Fixes #13

[codecov]

Codecov Report

Merging #14 into master will decrease coverage by 0.98%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master      #14      +/-   ##
============================================
- Coverage     88.72%   87.73%   -0.99%     
  Complexity       48       48              
============================================
  Files            12       12              
  Lines           266      269       +3     
  Branches         36       37       +1     
============================================
  Hits            236      236              
- Misses           25       28       +3     
  Partials          5        5

Impacted Files	Coverage Δ	Complexity Δ
...cy/graph/generator/DependencyGraphGeneratorTask.kt	3.57% <0%> (-0.43%)	5 <0> (ø)

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