Test/internal/nosql/cassandra test

[kevindiu]

Description:

This PR implements cassandra test.
It also include the following changes:

1. [Refactor] Create ClusterConfig mock implementation for the testing
2. [Refactor] Separate events struct definition for the testing
3. [Improvement] Avoid runtime instantiation of WhiteListHostFilter
4. [Bugfix] Use dcHost in DataCentreHostFilter

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.

[kevindiu]

/rebase

[vdaas-ci]

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• ⏪ /rebase - rebase master

[vdaas-ci]

[REBASE] Rebase triggered by kevindiu for branch: test/internal/nosql/cassandra-test

[vdaas-ci]

[REBASE] Failed to rebase.

[codecov]

Codecov Report

Merging #809 (4a2dc28) into master (baeb365) will increase coverage by 0.60%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master     #809      +/-   ##
==========================================
+ Coverage   17.37%   17.97%   +0.60%     
==========================================
  Files         420      421       +1     
  Lines       19500    19500              
==========================================
+ Hits         3388     3505     +117     
+ Misses      15905    15787     -118     
- Partials      207      208       +1     

Impacted Files	Coverage Δ
internal/db/nosql/cassandra/cassandra.go	97.43% <76.92%> (+97.43%)	⬆️
internal/db/nosql/cassandra/cassandra_mock.go	100.00% <100.00%> (ø)
internal/worker/worker.go	83.33% <0.00%> (+2.08%)	⬆️

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[hlts2]

LGTM

[vankichi]

/rebase
/format
/approve

[vdaas-ci]

[REBASE] Rebase triggered by vankichi for branch: test/internal/nosql/cassandra-test

[vdaas-ci]

[REBASE] Failed to rebase.

[vankichi]

/rebase
/format
/approve

[vdaas-ci]

[REBASE] Rebase triggered by vankichi for branch: test/internal/nosql/cassandra-test

[vdaas-ci]

[REBASE] Failed to rebase.

[vankichi]

/format
/approve

[vdaas-ci]

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

[vdaas-ci]

[FORMAT] Failed to format.