Upgrade our test coverage

[fthouraud]

While not being bad, our test coverage could be improved.

Here it is:

----------|---------|----------|---------|---------|-------------------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s             
----------|---------|----------|---------|---------|-------------------------------
All files |     100 |    83.33 |     100 |     100 |                               
 index.ts |     100 |    83.33 |     100 |     100 | 57-58,74-79,81-98,115,186-204 
----------|---------|----------|---------|---------|-------------------------------