Daily Test Coverage Improver - Add tests for useVariantConfigs hook

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Goal and Rationale

This PR adds comprehensive unit tests for the useVariantConfigs.ts hook (exported as useRuntimeEnvVarConfigs), which was previously untested (0% coverage).

Coverage area chosen: Simple utility hook in /react/src/hooks/useVariantConfigs.ts

Why it matters: This hook provides runtime environment variable configurations for model services (vLLM, SGLang, NIM). Testing it ensures:

• Correct configuration structure for each runtime
• Proper i18n integration for placeholder text
• Consistent API across all runtime configurations

Approach

Testing strategy:

• Unit testing with Jest and React Testing Library's renderHook
• Mock react-i18next to isolate translation logic
• Test all three runtime configurations (vllm, sglang, nim)
• Verify data structure consistency and completeness

Implementation steps:

1. Created comprehensive test suite with 11 test cases
2. Mocked i18n translation function
3. Tested each runtime configuration individually
4. Verified translation function calls
5. Tested structural consistency across all runtimes

Impact Measurement

Test Coverage Results

Metric	Before	After	Change
useVariantConfigs.ts Statements	0%	100%	+100%
useVariantConfigs.ts Branches	0%	100%	+100%
useVariantConfigs.ts Functions	0%	100%	+100%
useVariantConfigs.ts Lines	0%	100%	+100%
React Hooks Coverage (Statements)	8.64%	8.83%	+0.19%
React Hooks Coverage (Functions)	6.65%	6.88%	+0.23%
React Hooks Coverage (Lines)	8.67%	8.86%	+0.19%
Overall React Coverage (Statements)	4.08%	4.10%	+0.02%
Overall React Coverage (Functions)	2.33%	2.35%	+0.02%
Overall React Coverage (Lines)	3.92%	3.94%	+0.02%

Test Suite Results

• Test Suites: 15 total (13 passed previously, now 15 passed)
• Tests: 204 total (193 passed previously, now 204 passed)
• New Tests: 11 comprehensive test cases added

Trade-offs

What changed:

• Added test file: react/src/hooks/useVariantConfigs.test.ts (159 lines)
• No production code changes
• Test maintenance overhead: minimal (pure configuration hook, simple mocking)

Complexity:

• Tests are straightforward unit tests
• Mock setup is simple (i18n translation function)
• Follows existing test patterns in the codebase

Validation

Testing approach:

# Run new tests specifically
cd react && npx jest src/hooks/useVariantConfigs.test.ts

# Run full test suite with coverage
cd react && npx jest --coverage

Success criteria met:
✅ All 11 new tests pass
✅ 100% coverage achieved for useVariantConfigs.ts
✅ No existing tests broken
✅ Hooks coverage improved by 0.19-0.23%
✅ Overall React coverage improved by 0.02%

Test Cases Covered

1. vLLM configuration structure - Verifies vllm runtime has optionalEnvVars with 5 entries
2. vLLM BACKEND_MODEL_NAME - Tests specific environment variable presence
3. vLLM all variables - Verifies all 5 expected environment variables exist
4. SGLang configuration structure - Verifies sglang runtime has optionalEnvVars with 5 entries
5. SGLang BACKEND_MODEL_NAME - Tests specific environment variable presence
6. SGLang all variables - Verifies all 5 expected environment variables exist
7. NIM configuration structure - Verifies nim runtime has optionalEnvVars with 1 entry
8. NIM NGC_API_KEY - Tests specific environment variable presence
9. Translation integration - Verifies translation function is called for all placeholders
10. All runtime configurations - Confirms all three runtimes (vllm, sglang, nim) are present
11. Consistent structure - Validates data structure consistency across all runtimes

Future Work

Additional coverage opportunities identified:

Based on the baseline coverage analysis and previous PR recommendations, the next priority areas are:

1. More Simple Utility Hooks (0% coverage, high ROI):

   • useHighlight.ts - Code syntax highlighting with shiki
   • useKeyboardShortcut.ts - Keyboard event handling
   • useScrollBreackPoint.tsx - Scroll position tracking

2. Validation Hooks (important business logic):

   • useValidateServiceName.tsx - Service name validation
   • useValidateSessionName.tsx - Session name validation

3. State Management Hooks:

   • useLocalStorageGlobalState.tsx - Browser storage hook
   • useHiddenColumnKeysSetting.tsx - UI settings persistence

4. Backend.AI UI Package (packages/backend.ai-ui/src/helper/index.ts):

   • Currently at 63.08% statement coverage
   • Focus on untested functions to reach 80%+ coverage

Reproducibility

Setup Commands

# Install dependencies
pnpm install --ignore-scripts

# Navigate to React project
cd react

Run Tests

# Run only useVariantConfigs tests
NODE_OPTIONS='--no-deprecation --experimental-vm-modules' npx jest src/hooks/useVariantConfigs.test.ts

# Run all tests with coverage
NODE_OPTIONS='--no-deprecation --experimental-vm-modules' npx jest --coverage

Measurement Procedures

1. Coverage is collected via Jest's built-in coverage tool
2. Results are reported per-file and aggregated by directory
3. Coverage metrics: Statements, Branches, Functions, Lines

Expected Results Format

src/hooks
  useVariantConfigs.ts                                                      |     100 |      100 |     100 |     100 |

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Related: Discussion #4760 - Daily Test Coverage Improver Research and Plan

AI generated by Daily Test Coverage Improver

AI generated by Daily Test Coverage Improver