server: catch errors while creating and closing a test app

[dirkdev98]

Closes #655

[github-actions]

==== Benchmark result ====

Node.js version: 14
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    6606  ns/op
router - github path params              200000  iterations    9046  ns/op
compas validator simple                 5000000  iterations     227  ns/op
yup validator simple                     100000  iterations   10657  ns/op
fastest-validator validator simple     20000000  iterations     100  ns/op
compas validator nested                 1000000  iterations    1159  ns/op
yup validator nested                      50000  iterations   32452  ns/op
fastest-validator validator nested      5000000  iterations     471  ns/op
logger - strings                         500000  iterations    2384  ns/op
logger - objects                         500000  iterations    2936  ns/op
logger - deep objects                    500000  iterations    4325  ns/op
uuid                                    5000000  iterations     444  ns/op
uuid.isValid                           10000000  iterations     134  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      18  ns/op

[github-actions]

==== Benchmark result ====

Node.js version: 15
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    8239  ns/op
router - github path params              100000  iterations   10120  ns/op
compas validator simple                 5000000  iterations     255  ns/op
yup validator simple                     100000  iterations   11949  ns/op
fastest-validator validator simple     10000000  iterations     107  ns/op
compas validator nested                 1000000  iterations    1508  ns/op
yup validator nested                      50000  iterations   43963  ns/op
fastest-validator validator nested      2000000  iterations     538  ns/op
logger - strings                         500000  iterations    2883  ns/op
logger - objects                         500000  iterations    3575  ns/op
logger - deep objects                    200000  iterations    6075  ns/op
uuid                                    5000000  iterations     382  ns/op
uuid.isValid                           10000000  iterations     140  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      19  ns/op

[github-actions]

==== C8 test coverage ====
Statements: 66.42% ( 24601/37041 )
Branches : 65.25% ( 2715 /4161 )
Functions : 66.86% ( 825 /1234 )
Lines : 66.42% ( 24601 /37041 )