test: poa cover staking hook error propagation in MsgServer remove

[kpitapeersyst]

test: poa cover staking hook error propagation in MsgServer remove

Motivation 💡

The shared poaKeeperTestSetup fixture in x/poa/keeper/keeper_test.go configured MockStakingHooks with .AnyTimes() matchers that always returned nil. TestMsgServer_AddValidator and TestMsgServer_RemoveValidator reused this fixture, so their "should pass" cases never exercised the BeforeValidatorModified or BeforeValidatorSlashed error paths at the MsgServer layer. If a future change silently dropped hook errors during validator removal, the existing suite would not catch it.

Changes 🛠

• Removed the always-pass poaKeeperTestSetup fixture from keeper_test.go.
• Moved the poaAuthority constant into common_test.go for reuse across tests.
• Refactored TestMsgServer_AddValidator and TestMsgServer_RemoveValidator to declare per-case stakingMocks / bankMocks closures and build the keeper via setupPoaKeeper, so each case owns its own expectations.
• Added two MsgServer cases asserting hook errors are swallowed and logged:
  • BeforeValidatorModified returning an error -> log contains "failed to call before validator modified hook", RemoveValidator still succeeds.
  • BeforeValidatorSlashed returning an error -> log contains "failed to call before validator slashed hook", RemoveValidator still succeeds.
• Captured log output via cosmossdk.io/log JSON logger into a bytes.Buffer and asserted substring presence with require.Contains.

Considerations 🤔

• These tests lock in the current behavior of keeper.ExecuteRemoveValidator: hook errors are logged via k.Logger(ctx).Error(...) and execution continues. If the policy changes to propagate hook errors, both new cases must be updated.

Summary by CodeRabbit

• Tests
  • Refactored test infrastructure with improved mock setup patterns for better test isolation.
  • Enhanced test coverage for validator operations with comprehensive mock-driven test cases.
  • Improved test logging and assertion capabilities for better validation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 668fa4f0-677c-48d8-aaeb-d468737cc6d6

📥 Commits

Reviewing files that changed from the base of the PR and between 43c1c36 and c3fea9a.

📒 Files selected for processing (4)

• x/poa/keeper/common_test.go
• x/poa/keeper/keeper_test.go
• x/poa/keeper/msg_server_add_validator_test.go
• x/poa/keeper/msg_server_remove_validator_test.go

💤 Files with no reviewable changes (1)

• x/poa/keeper/keeper_test.go

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📝 Walkthrough

Walkthrough

These changes refactor test infrastructure for the POA keeper by extracting a test-local authority constant, removing a redundant helper function, and refactoring test cases to supply per-test-case mock setup callbacks for staking and bank keepers. Hook error handling and log assertions are added to remove validator tests.

Changes

POA Keeper Test Infrastructure Refactoring

Layer / File(s)	Summary
Test Constants x/poa/keeper/common_test.go	Extracts poaAuthority constant ("ethm1wunfhl05vc8r8xxnnp8gt62wa54r6y52pg03zq") for reuse across tests; updates NewKeeper call to use the constant instead of inline string literal.
Helper Removal x/poa/keeper/keeper_test.go	Removes poaKeeperTestSetup function that previously wrapped staking/bank mock expectations; tests now call setupPoaKeeper directly.
Test Refactoring: AddValidator x/poa/keeper/msg_server_add_validator_test.go	Imports cosmossdk.io/math and sdk alias; restructures test table to accept per-case stakingMocks and bankMocks callbacks; detailed mock expectations added for staking parameters, validators, delegations, and bank balance/mint operations; setupPoaKeeper called per subtest with case-specific mocks.
Test Refactoring: RemoveValidator x/poa/keeper/msg_server_remove_validator_test.go	Imports updated to support hook testing and log assertions (cosmossdk.io/log, gomock, testutil); test table expanded with stakingMocks, bankMocks, and expectedLog fields; two new cases validate that hook errors from BeforeValidatorModified and BeforeValidatorSlashed are swallowed while emitting log messages; conditional logger-buffer wiring added to capture and assert log output.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

Poem

🐰 A constant springs forth, clear and bright,
Old helpers rest, no more in sight,
Mock callbacks dance case by case,
Hooks swallowed gently, logged in place. ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and specifically summarizes the main change: adding test coverage for staking hook error propagation in MsgServer RemoveValidator.
Description check	✅ Passed	The description follows the template structure completely with clear Motivation, Changes, and Considerations sections that comprehensively explain the refactoring and new test coverage.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/poa-hook-error-propagation

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.1)

Error: can't load config: unsupported version of the configuration: "" See https://golangci-lint.run/docs/product/migration-guide for migration instructions
The command is terminated due to an error: can't load config: unsupported version of the configuration: "" See https://golangci-lint.run/docs/product/migration-guide for migration instructions

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