refactor(test): improve test quality

[steoj]

No description provided.

[github-actions]

Test Coverage

Jest Coverage (summary)

Lines	Statements	Branches	Functions
	100% (300/300)	100% (91/91)	100% (58/58)

Coverage Report (100%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	100	100	100	100
ChangeFailureRate.ts	100	100	100	100
CommitsAdapter.ts	100	100	100	100
DeployFrequency.ts	100	100	100	100
IssuesAdapter.ts	100	100	100	100
LeadTime.ts	100	100	100	100
MeanTimeToRestore.ts	100	100	100	100
PullRequestsAdapter.ts	100	100	100	100
ReleaseAdapter.ts	100	100	100	100
index.ts	100	100	100	100

[github-actions]

Code Coverage change
This PR changes coverage by 0 %
Component coverage will change from 100% to 100%.

[github-actions]

Stryker report

File	% score	# killed	# timeout	# survived	# no cov	# errors
DeployFrequency.ts	100.00	29	0	0	0	12
LeadTime.ts	70.45	62	0	26	0	17
MeanTimeToRestore.ts	86.27	88	0	14	0	24
ChangeFailureRate.ts	87.36	76	0	11	0	11
CommitsAdapter.ts	20.00	1	0	4	0	4
IssuesAdapter.ts	85.00	17	0	3	0	6
PullRequestsAdapter.ts	45.00	9	0	11	0	6
ReleaseAdapter.ts	45.00	9	0	11	0	6
index.ts	69.77	60	0	26	0	3
All	76.81	351	0	106	0	89