add ut for pkg/util/annotation

[jxs1211]

Signed-off-by: xian-jie.shen 327411586@qq.com

Pre-Checklist

Description

add ut

New Behavior (screenshots if needed)

[root@dev testing]# go test annotation_test.go annotation.go -v -cover 
=== RUN   TestGetRegion
=== RUN   TestGetRegion/base
=== RUN   TestGetRegion/LabelZoneRegion
=== RUN   TestGetRegion/not_found
--- PASS: TestGetRegion (0.00s)
    --- PASS: TestGetRegion/base (0.00s)
    --- PASS: TestGetRegion/LabelZoneRegion (0.00s)
    --- PASS: TestGetRegion/not_found (0.00s)
=== RUN   TestGetZone
=== RUN   TestGetZone/base
=== RUN   TestGetZone/LabelZoneFailureDomain
=== RUN   TestGetZone/not_found
--- PASS: TestGetZone (0.00s)
    --- PASS: TestGetZone/base (0.00s)
    --- PASS: TestGetZone/LabelZoneFailureDomain (0.00s)
    --- PASS: TestGetZone/not_found (0.00s)
=== RUN   TestGetInstanceType
=== RUN   TestGetInstanceType/base
=== RUN   TestGetInstanceType/LabelInstanceTypeStable
=== RUN   TestGetInstanceType/not_found
--- PASS: TestGetInstanceType (0.00s)
    --- PASS: TestGetInstanceType/base (0.00s)
    --- PASS: TestGetInstanceType/LabelInstanceTypeStable (0.00s)
    --- PASS: TestGetInstanceType/not_found (0.00s)
=== RUN   TestGetOperatingSystem
=== RUN   TestGetOperatingSystem/base
=== RUN   TestGetOperatingSystem/betaLabel
=== RUN   TestGetOperatingSystem/not_found
--- PASS: TestGetOperatingSystem (0.00s)
    --- PASS: TestGetOperatingSystem/base (0.00s)
    --- PASS: TestGetOperatingSystem/betaLabel (0.00s)
    --- PASS: TestGetOperatingSystem/not_found (0.00s)
PASS
coverage: 100.0% of statements
ok      command-line-arguments  0.010s  coverage: 100.0% of statements

[mfanjie]

there is no need to make such change as the original code line is a better approach to me, it create a variable in smaller scope and the memory would be release soon. and it's a common practice in golang.
if _, ok := labels[v1.LabelTopologyRegion]; ok {

[jxs1211]

there is no need to make such change as the original code line is a better approach to me, it create a variable in smaller scope and the memory would be release soon. and it's a common practice in golang. if _, ok := labels[v1.LabelTopologyRegion]; ok {

The original code has a little bit much if-else, which seems is not necessary, so the pr is try to reduce the unnecessary code for making the logic clearn.
Speaking of golang's idioms, on one hand I suppose happy path is the commonly used way in golang for reducing indent and embeded codes, on the other hand the memory will be eventually released after the function returned, just sooner or later, not a big deal.

[qmhu]

agreed with @mfanjie

[jxs1211]

agreed with @mfanjie

@qmhu @mfanjie
updated.