VisibilityFixerTest - few more test cases
minor #362 VisibilityFixerTest - few more test cases (keradus)

This PR was merged into the 0.5.x-dev branch.

Discussion
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VisibilityFixerTest - few more test cases

Test cases to satisfy #132 issue, to never let this issue come back ;)

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c6aebe7 VisibilityFixerTest - few more test cases