test: improve coverage in client builder and time types

[msga-mmm]

Increased a bit the test coverage. around +0.11%.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.81%. Comparing base (1b3a530) to head (4241b94).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #357 +/- ## ========================================== + Coverage 90.70% 90.81% +0.11% ========================================== Files 197 197 Lines 31664 31682 +18 ========================================== + Hits 28721 28773 +52 + Misses 2943 2909 -34 ```

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[fafhrd91]

thanks!