IG Module code coverage improvement

[franck-ledoux]

The aim of this issue is to increase the code coverage percentage of the ig component to reach at least 75% of coverage.
To do that new test suites must be added in the tst/ sub repository of ig module

[create-issue-branch]

Branch issue-343-IG_Module_code_coverage_improvement created!

[franck-ledoux]

Closed due to lack of time to do it right now