Move integration test files out of resources and into code

[LachlanMcKee]

Relates to issue #251

[codecov[bot]]

Codecov Report

Merging #252 into develop will not change coverage. The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #252   +/-   ##
==========================================
  Coverage      80.83%   80.83%           
  Complexity       456      456           
==========================================
  Files             91       91           
  Lines           1993     1993           
  Branches         295      295           
==========================================
  Hits            1611     1611           
  Misses           305      305           
  Partials          77       77

Flag	Coverage Δ	Complexity Δ
#integration	87.52% <ø> (ø)	441 <ø> (ø)	:arrow_down:
#unit_tests	80.83% <ø> (ø)	456 <ø> (ø)	:arrow_down:

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