Refactor: aggregate variables into a structure

[nao1215]

No description provided.

[github-actions]

Code Metrics Report

	main (9dd3ad3)	#82 (f36018a)	+/-
Coverage	82.5%	82.7%	+0.2%
Test Execution Time	8s	5s	-3s

Details

  |                     | main (9dd3ad3) | #82 (f36018a) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          82.5% |         82.7% | +0.2% |
  |   Files             |             19 |            21 |    +2 |
  |   Lines             |           1551 |          1566 |   +15 |
+ |   Covered           |           1280 |          1295 |   +15 |
+ | Test Execution Time |             8s |            5s |   -3s |

Code coverage of files in pull request scope (81.3% → 81.5%)

Files	Coverage	+/-
assert.go	22.4%	0.0%
authentication.go	100.0%	+100.0%
debug.go	93.3%	-6.7%
mocks.go	86.4%	-0.1%
network.go	100.0%	+100.0%
request.go	89.2%	+0.1%
response.go	96.2%	-0.0%
spectest.go	96.3%	+0.2%

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Reported by octocov