Improve test stability

[vboulineau]

What does this PR do?

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Motivation

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[codecov-io]

Codecov Report

Merging #161 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #161   +/-   ##
=======================================
  Coverage   59.51%   59.51%           
=======================================
  Files          33       33           
  Lines        4456     4456           
=======================================
  Hits         2652     2652           
  Misses       1593     1593           
  Partials      211      211           

Flag	Coverage Δ
#unittests	59.51% <ø> (ø)

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