test: add fuzz tests for chaos experiment run MongoDB operator

[jaehyyuun]

Proposed changes

Fixes #5544

Add fuzz tests for MongoDB operator functions in the chaos experiment run package.

The following functions in
chaoscenter/graphql/server/pkg/database/mongodb/chaos_experiment_run/operations.go are covered:

• CreateExperimentRun
• GetExperimentRun
• GetExperimentRuns
• UpdateExperimentRun
• UpdateExperimentRunWithQuery
• UpdateExperimentRunsWithQuery
• GetExperimentRunsByInfraID
• GetAggregateExperimentRuns

Types of changes

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• New feature (non-breaking change which adds functionality)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices applies)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have signed the commit for DCO to be passed.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

Dependency

None

Special notes for your reviewer:

Fuzz tests follow the existing patterns in:

• chaoscenter/graphql/server/pkg/chaos_experiment_run/handler/fuzz_tests/handler_fuzz_test.go
• chaoscenter/graphql/server/pkg/chaos_experiment_run/fuzz_tests/service_fuzz_test.go

To verify the tests pass:

cd chaoscenter/graphql/server
go test ./pkg/database/mongodb/chaos_experiment_run/fuzz_tests/...

To run a specific fuzz target:

go test ./pkg/database/mongodb/chaos_experiment_run/fuzz_tests/... -run=FuzzCreateExperimentRun -fuzz=FuzzCreateExperimentRun -fuzztime=30s

[Copilot]

Pull request overview

Adds Go fuzz tests to improve robustness coverage for the MongoDB chaos experiment run operator layer (operations.go) by exercising its public CRUD/query methods with arbitrary inputs using the existing AdaLogics fuzzing pattern already present in the repo.

Changes:

• Introduces operator_fuzz_test.go with fuzz targets for the chaos experiment run MongoDB operator methods.
• Mocks the MongoDB operator calls to keep fuzz targets deterministic and focused on “no panic” behavior for malformed inputs.

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[Copilot]

Pull request overview

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