feature: [refactor]add code coverage for api

[nic-chen]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Question or discussion
• Bug
• Requirements
• Feature or performance improvement
• Other

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Requirement or improvement

Add code coverage for api
And improve code coverage

[juzhiyuan]

Should this issue be resolved in or after 2.0?

[moonming]

yes, can be put after 2.0.
But what is the coverage of the code now? @nic-chen

[nic-chen]

@moonming
here is the result currently:

?   	github.com/apisix/manager-api	[no test files]
?   	github.com/apisix/manager-api/conf	[no test files]
?   	github.com/apisix/manager-api/filter	[no test files]
?   	github.com/apisix/manager-api/internal	[no test files]
ok  	github.com/apisix/manager-api/internal/core/entity	0.970s	coverage: 19.7% of statements
?   	github.com/apisix/manager-api/internal/core/storage	[no test files]
ok  	github.com/apisix/manager-api/internal/core/store	2.216s	coverage: 72.2% of statements
?   	github.com/apisix/manager-api/internal/handler	[no test files]
ok  	github.com/apisix/manager-api/internal/handler/authentication	1.161s	coverage: 83.3% of statements
ok  	github.com/apisix/manager-api/internal/handler/consumer	2.429s	coverage: 62.8% of statements
?   	github.com/apisix/manager-api/internal/handler/healthz	[no test files]
ok  	github.com/apisix/manager-api/internal/handler/plugin	0.907s	coverage: 75.0% of statements
ok  	github.com/apisix/manager-api/internal/handler/route	2.918s	coverage: 60.0% of statements
ok  	github.com/apisix/manager-api/internal/handler/service	2.944s	coverage: 40.3% of statements
ok  	github.com/apisix/manager-api/internal/handler/ssl	1.899s	coverage: 40.5% of statements
ok  	github.com/apisix/manager-api/internal/handler/upstream	1.561s	coverage: 28.3% of statements
ok  	github.com/apisix/manager-api/internal/utils	0.708s	coverage: 63.3% of statements

[nic-chen]

We have collected code coverage for unit test.

But can't find a way to collect coverage for e2e test.

I created an issue to continue tracking to see if I can find a solution. #966

close this first.