Improved unit tests in 'test_clerk'.
Improved unit tests in 'test_clerk'.

olitheolix/azrael,daviddeng/azrael,olitheolix/azrael,daviddeng/azrael,olitheolix/azrael,daviddeng/azrael,daviddeng/azrael,olitheolix/azrael,olitheolix/azrael,daviddeng/azrael