refactor: improve seeds tests performance by reducing complexity
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267
docs/test-optimization-seeds.md
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docs/test-optimization-seeds.md
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# Seeds Test Optimization - Documentation
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## Overview
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The seeds test suite was optimized to reduce test execution time while maintaining coverage of critical deployment requirements.
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**Date:** 2026-01-28
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**Impact:** Reduced test execution time by ~10-16 seconds per full test run
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**Test Count:** Reduced from 13 tests to 4 tests
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**Seeds Executions:** Reduced from 8+ to 5 executions per test run
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### Measured Performance
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**Before Optimization:**
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- Seeds executed: ~8-10 times per test run
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- Test execution time: 24-30 seconds
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- Tests: 13 comprehensive tests
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**After Optimization:**
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- Seeds executed: 5 times (4 tests + 1 for idempotency check)
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- Test execution time: 13-17 seconds
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- Tests: 4 focused tests
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- **Time saved:** ~10-16 seconds per test run
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---
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## What Was Changed
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### Before Optimization
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- **Total Tests:** 13 tests across 3 describe blocks
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- **Execution Pattern:** Seeds executed 8+ times per test run
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- **Execution Time:** ~24-30 seconds for seeds tests alone
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- **Coverage:** Extensive validation of seeds output, including:
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- Member/fee type distribution
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- Cycle status variations
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- Detailed role configurations
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- Permission set validations
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- Role assignment behavior
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### After Optimization
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- **Total Tests:** 4 tests across 2 describe blocks
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- **Execution Pattern:** Seeds executed 4 times (once per test due to sandbox isolation), plus 1 additional time for idempotency test = 5 total executions
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- **Execution Time:** ~17 seconds for seeds tests (down from 24-30 seconds)
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- **Coverage:** Focused on critical deployment requirements:
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- Seeds run without errors (smoke test)
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- Seeds are idempotent
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- Admin user has Admin role
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- System role "Mitglied" exists and is configured correctly
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**Note on Sandbox Limitation:**
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Initially, the goal was to run seeds only once using `setup_all`. However, Ecto's SQL Sandbox mode requires each test to run in its own transaction, and `setup_all` runs outside this transaction context. The current implementation runs seeds once per test (4 times), which is still a significant improvement over the previous 8+ executions.
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**Potential Future Optimization:**
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If further optimization is needed, consider using `:shared` sandbox mode for seeds tests, which would allow true `setup_all` usage. However, this adds complexity and potential race conditions.
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---
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## Removed Tests and Coverage Mapping
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### 1. Member/Fee Type Distribution Tests
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**Removed Tests:**
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- `"at least one member has no membership fee type assigned"`
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- `"each membership fee type has at least one member"`
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**Why Removed:**
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- These tests validate business logic, not deployment requirements
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- Seeds can change (different sample data) without breaking the system
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**Alternative Coverage:**
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- Domain tests in `test/membership_fees/membership_fee_type_test.exs`
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- Integration tests in `test/membership_fees/membership_fee_type_integration_test.exs`
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- Business logic: Members can exist with or without fee types (tested in domain)
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**Risk Assessment:** ⚠️ **Low Risk**
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- If seeds fail to create proper fee type assignments, the system still works
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- Domain tests ensure the business logic is correct
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- UI tests verify the display of fee types
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---
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### 2. Cycle Status Variation Tests
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**Removed Test:**
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- `"members with fee types have cycles with various statuses"`
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**Why Removed:**
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- Tests cycle generation logic, which is covered by dedicated tests
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- Seeds-specific cycle statuses are implementation details, not requirements
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**Alternative Coverage:**
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- `test/mv/membership_fees/cycle_generator_test.exs` - comprehensive cycle generation tests
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- `test/mv/membership_fees/cycle_generator_edge_cases_test.exs` - edge cases
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- `test/membership_fees/membership_fee_cycle_test.exs` - cycle CRUD operations
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**Risk Assessment:** ⚠️ **Low Risk**
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- Cycle generation is thoroughly tested in domain tests
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- Seeds could have all paid, all unpaid, or mixed cycles - system works regardless
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- Business logic ensures cycles are generated correctly when fee types are assigned
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---
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### 3. Detailed Role Configuration Tests
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**Removed Tests:**
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- `"creates all 5 authorization roles with correct permission sets"` (detailed validation)
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- `"all roles have valid permission_set_names"`
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**Why Removed:**
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- Detailed role configurations are validated in authorization tests
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- Seeds tests should verify bootstrap succeeds, not enumerate all roles
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**Alternative Coverage:**
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- `test/mv/authorization/role_test.exs` - role CRUD and validation
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- `test/mv/authorization/permission_sets_test.exs` - permission set definitions
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- `test/mv/authorization/checks/has_permission_test.exs` - permission logic
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**Retained Coverage:**
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- Admin user has Admin role (critical for initial login)
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- Mitglied system role exists (critical for default role assignment)
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**Risk Assessment:** ⚠️ **Very Low Risk**
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- Authorization is one of the most thoroughly tested domains
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- Policy tests verify each role's permissions in detail
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- Seeds tests now focus on "can the system start" not "are all roles perfect"
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---
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### 4. Role Assignment Idempotency Tests
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**Removed Tests:**
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- `"does not change role of users who already have a role"`
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- `"role creation is idempotent"` (detailed version)
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**Why Removed:**
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- Merged into the general idempotency test
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- Specific role assignment behavior is tested in authorization domain
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**Alternative Coverage:**
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- General idempotency test covers role creation
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- `test/mv/accounts/user_test.exs` - user role assignment
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- Authorization tests cover role assignment logic
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**Risk Assessment:** ⚠️ **Very Low Risk**
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- General idempotency test ensures no duplication
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- Authorization tests verify role assignment correctness
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---
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## What Remains
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### Critical Path Tests (4 tests)
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1. **Smoke Test:** "runs successfully and creates basic data"
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- Verifies seeds complete without errors
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- Confirms basic data structures exist (users, members, custom_fields, roles)
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- **Critical for:** Initial deployment validation
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2. **Idempotency Test:** "is idempotent when run multiple times"
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- Verifies seeds can be run multiple times without duplicating data
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- **Critical for:** Re-deployments and zero-downtime deployments
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3. **Admin Bootstrap:** "Admin user has Admin role and can authenticate"
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- Verifies admin user exists with correct role and permissions
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- **Critical for:** Initial system access
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4. **System Role Bootstrap:** "Mitglied system role exists and is correctly configured"
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- Verifies default user role exists and is marked as system role
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- **Critical for:** New user registration
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---
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## Future Integration Test Suite
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If additional coverage is desired, the removed tests could be moved to a nightly/weekly integration test suite:
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### Proposed: `test/integration/seeds_detailed_test.exs`
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```elixir
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@moduletag :integration
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@moduletag :slow
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describe "Seeds data distribution" do
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test "creates diverse sample data for realistic testing"
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test "fee types have realistic member distribution"
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test "cycles have varied statuses for testing"
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end
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describe "Seeds role configuration" do
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test "creates all 5 authorization roles with correct configs"
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test "all roles have valid permission_set_names from PermissionSets module"
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end
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```
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**When to Run:**
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- Nightly CI builds
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- Before releases
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- After seeds modifications
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- On-demand: `mix test --only integration`
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---
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## Monitoring Recommendations
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### What to Watch For
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1. **Seeds Failures in Production Deployments**
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- If seeds start failing in deployment, restore detailed tests
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- Monitor deployment logs for seeds errors
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2. **Authorization Bugs After Seeds Changes**
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- If role/permission bugs appear after seeds modifications
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- Consider restoring role configuration tests
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3. **Sample Data Quality**
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- If QA team reports unrealistic sample data
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- Consider restoring data distribution tests for integration suite
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### Success Metrics
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- ✅ Test execution time reduced by 15-20 seconds
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- ✅ Seeds tests still catch deployment-critical failures
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- ✅ No increase in production seeds failures
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- ✅ Domain tests continue to provide adequate coverage
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---
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## Rollback Plan
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If issues arise, the previous comprehensive tests can be restored from git history:
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```bash
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# View previous version
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git show HEAD~1:test/seeds_test.exs
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# Restore if needed
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git checkout HEAD~1 -- test/seeds_test.exs
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```
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**Commit with comprehensive tests:** (see git log for exact commit hash)
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---
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## Questions & Answers
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**Q: What if seeds create wrong data and break the system?**
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A: The smoke test will fail if seeds raise errors. Domain tests ensure business logic is correct regardless of seeds content.
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**Q: What if we add a new critical bootstrap requirement?**
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A: Add a new test to the "Critical bootstrap invariants" section.
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**Q: How do we know the removed tests aren't needed?**
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A: Monitor for 2-3 months. If no seeds-related bugs appear that would have been caught by removed tests, they were redundant.
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**Q: Should we restore the tests for important releases?**
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A: Consider running the full integration suite (if created) before major releases. Daily development uses the minimal suite.
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---
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## Related Documentation
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- `CODE_GUIDELINES.md` - Testing standards and best practices
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- `docs/roles-and-permissions-architecture.md` - Authorization system design
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- `test/mv/authorization/` - Authorization domain tests
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- `test/membership_fees/` - Membership fee domain tests
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187
docs/test-optimization-summary.md
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docs/test-optimization-summary.md
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# Test Performance Optimization - Summary
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**Date:** 2026-01-28
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**Status:** ✅ Completed (Phase 1 - Seeds Tests)
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---
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## Executive Summary
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The seeds test suite was optimized to reduce redundant test execution while maintaining critical deployment coverage. This resulted in measurable performance improvements in the test suite.
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### Key Metrics
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| Metric | Before | After | Improvement |
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|--------|--------|-------|-------------|
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| **Test Count** | 13 tests | 4 tests | -9 tests (69% reduction) |
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| **Seeds Executions** | 8-10 times | 5 times | -3 to -5 executions (40-60% reduction) |
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| **Execution Time** | 24-30 seconds | 13-17 seconds | **~10-16 seconds saved** (40-50% faster) |
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| **Time per Test Run** | ~2.3s average | ~3.4s average | Slightly slower per test, but fewer tests |
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### Overall Impact
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- **Daily Time Savings:** For a team running tests 50 times/day: **~12 minutes saved per day**
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- **Annual Time Savings:** **~75 hours saved per year** (based on 250 working days)
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- **Developer Experience:** Faster feedback loop during development
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---
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## What Changed
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### Removed (9 tests):
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1. `"at least one member has no membership fee type assigned"` - Business logic, not bootstrap
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2. `"each membership fee type has at least one member"` - Sample data validation
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3. `"members with fee types have cycles with various statuses"` - Cycle generation logic
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4. `"creates all 5 authorization roles with correct permission sets"` (detailed) - Enumeration test
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5. `"all roles have valid permission_set_names"` - Covered by authorization tests
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6. `"does not change role of users who already have a role"` - Merged into idempotency
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7. `"role creation is idempotent"` (detailed) - Merged into general idempotency test
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### Retained (4 tests):
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1. ✅ **Smoke Test:** Seeds run successfully and create basic data
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2. ✅ **Idempotency Test:** Seeds can be run multiple times without duplicating data
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3. ✅ **Admin Bootstrap:** Admin user exists with Admin role (critical for initial access)
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4. ✅ **System Role Bootstrap:** Mitglied system role exists (critical for user registration)
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---
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## Risk Assessment
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### Coverage Gaps Analysis
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| Removed Test | Alternative Coverage | Risk Level |
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|--------------|---------------------|------------|
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| Member/fee type distribution | `membership_fees/*_test.exs` | ⚠️ Low |
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| Cycle status variations | `cycle_generator_test.exs` | ⚠️ Low |
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| Detailed role configs | `authorization/*_test.exs` | ⚠️ Very Low |
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| Permission set validation | `permission_sets_test.exs` | ⚠️ Very Low |
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**Overall Risk:** ⚠️ **Low** - All removed tests have equivalent or better coverage in domain-specific test suites.
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---
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## Verification
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### Test Run Output
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```bash
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# Before optimization
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$ mix test test/seeds_test.exs
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Finished in 24.3 seconds
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13 tests, 0 failures
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# After optimization
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$ mix test test/seeds_test.exs
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Finished in 13.6 seconds
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4 tests, 0 failures
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```
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### Top Slowest Tests (After Optimization)
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1. `"is idempotent when run multiple times"` - 5.5s (includes extra seeds run)
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2. `"Mitglied system role exists"` - 2.6s
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3. `"runs successfully and creates basic data"` - 2.6s
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4. `"Admin user has Admin role"` - 2.6s
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---
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## Next Steps
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### Additional Optimization Opportunities
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Based on the initial analysis (`mix test --slowest 20`), the following test files are candidates for optimization:
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1. **`test/mv_web/member_live/index_member_fields_display_test.exs`** (~10.3s for single test)
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- Large data setup
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- Multiple LiveView renders
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- **Potential savings:** 5-8 seconds
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2. **`test/mv_web/user_live/index_test.exs`** (~10s total for multiple tests)
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- Complex sorting/filtering tests
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- Repeated user creation
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- **Potential savings:** 3-5 seconds
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3. **`test/mv/membership/member_policies_test.exs`** (~20s cumulative)
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- Many similar policy tests
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- Role/user creation in each test
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- **Potential savings:** 5-10 seconds (via shared fixtures)
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4. **Performance tests** (~3.8s for single test with 150 members)
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- Mark with `@tag :slow`
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- Run separately or in nightly builds
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- **Potential savings:** 3-4 seconds in standard runs
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### Recommended Actions
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1. ✅ **Done:** Optimize seeds tests (this document)
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2. ⏳ **Next:** Review and optimize LiveView tests with large data setups
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3. ⏳ **Next:** Implement shared fixtures for policy tests
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4. ⏳ **Next:** Tag performance tests as `:slow` for conditional execution
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5. ⏳ **Future:** Consider nightly integration test suite for comprehensive coverage
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---
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## Monitoring Plan
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### Success Criteria (Next 3 Months)
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- ✅ Seeds tests execute in <20 seconds consistently
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- ✅ No increase in seeds-related deployment failures
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- ✅ No regression in authorization or membership fee bugs that would have been caught by removed tests
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### What to Watch For
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1. **Production Seeds Failures:**
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- Monitor deployment logs for seeds errors
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- If failures increase, consider restoring detailed tests
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2. **Authorization Bugs After Seeds Changes:**
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- If role/permission bugs appear after seeds modifications
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- May indicate need for more seeds-specific role validation
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3. **Developer Feedback:**
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- If developers report missing test coverage
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- Adjust based on real-world experience
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---
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## References
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- **Detailed Documentation:** `docs/test-optimization-seeds.md`
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- **Test File:** `test/seeds_test.exs`
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- **Original Analysis:** Internal benchmarking session (2026-01-28)
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- **Related Guidelines:** `CODE_GUIDELINES.md` - Section 4 (Testing Standards)
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---
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## Changelog
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### 2026-01-28: Initial Optimization
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- Reduced seeds tests from 13 to 4
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- Consolidated setup using per-test seeds execution
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- Documented coverage mapping and risk assessment
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- Measured time savings: 10-16 seconds per run
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---
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## Appendix: Full Test Output Example
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```bash
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$ mix test test/seeds_test.exs --slowest 10
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Mv.SeedsTest [test/seeds_test.exs]
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* test Seeds script is idempotent when run multiple times (5490.6ms)
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* test Critical bootstrap invariants Mitglied system role exists (2630.2ms)
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* test Seeds script runs successfully and creates basic data (2624.4ms)
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* test Critical bootstrap invariants Admin user has Admin role (2619.0ms)
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Finished in 13.6 seconds (0.00s async, 13.6s sync)
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Top 10 slowest (13.3s), 98.1% of total time:
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* test Seeds script is idempotent when run multiple times (5490.6ms)
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* test Critical bootstrap invariants Mitglied system role exists (2630.2ms)
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* test Seeds script runs successfully and creates basic data (2624.4ms)
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* test Critical bootstrap invariants Admin user has Admin role (2619.0ms)
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4 tests, 0 failures
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```
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