Add cassandra option test (part 3)

[kevindiu]

Description:

This PR implements the test case for cassandra_option.

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.15.2
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.1

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - add changelog comment
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase master

[codecov]

Codecov Report

Merging #798 into master will increase coverage by 0.48%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
+ Coverage   16.91%   17.39%   +0.48%     
==========================================
  Files         421      421              
  Lines       19534    19554      +20     
==========================================
+ Hits         3304     3402      +98     
+ Misses      16005    15937      -68     
+ Partials      225      215      -10     

Impacted Files	Coverage Δ
internal/db/nosql/cassandra/option.go	100.00% <100.00%> (+41.66%)	⬆️
internal/db/storage/blob/s3/reader/reader.go	65.90% <0.00%> (-31.82%)	⬇️
internal/worker/worker.go	83.33% <0.00%> (+1.04%)	⬆️

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[kevindiu]

/rebase

[vdaas-ci]

[REBASE] Rebase triggered by kevindiu for branch: test/internal/db/cassandra-option-part3

[hlts2]

LGTM

[vankichi]

LGTM

[vankichi]

/rebase
/format
/approve

[vdaas-ci]

[REBASE] Rebase triggered by vankichi for branch: test/internal/db/cassandra-option-part3

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by vankichi.

[vdaas-ci]

[APPROVED] This PR is approved by vankichi.

[vankichi]

/rebase
/format
/approve

[vdaas-ci]

[REBASE] Rebase triggered by vankichi for branch: test/internal/db/cassandra-option-part3

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by vankichi.

[vdaas-ci]

[APPROVED] This PR is approved by vankichi.