CodeRabbit Generated Unit Tests: Add presence modules and comprehensive unit tests

TEST_COVERAGE_SUMMARY.md

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+# Test Coverage Summary for User Presence Changes
+
+This document summarizes the comprehensive test coverage added for the user presence and connection status management changes.
+
+## Files Changed and Test Coverage
+
+### 1. `ee/packages/presence/src/processPresenceAndStatus.ts`
+**New file containing presence status calculation logic with time-based filtering**
+
+**Test File:** `ee/packages/presence/tests/lib/processPresenceAndStatus.test.ts`
+
+**Coverage:**
+- ✅ Basic single connection scenarios with all status combinations
+- ✅ Multiple concurrent connections (2+ connections)
+- ✅ Empty connection arrays (offline users)
+- ✅ Time-based filtering (5-minute window)
+  - Exact boundary conditions (300,000ms)
+  - Just under boundary (299,999ms)
+  - Just over boundary (300,001ms)
+  - Very stale connections (days old)
+  - Future timestamps (clock skew scenarios)
+- ✅ Mixed fresh and stale connections
+- ✅ Priority handling (ONLINE > BUSY > AWAY > OFFLINE)
+- ✅ Default parameter handling (undefined inputs)
+- ✅ Large number of connections
+- ✅ All combinations of connection and default statuses
+- ✅ Edge cases with BUSY status
+- ✅ Reducer function behavior validation
+
+### 2. `ee/packages/presence/src/lib/processStatus.ts`
+**New file containing status resolution logic**
+
+**Test File:** `ee/packages/presence/tests/lib/processStatus.test.ts`
+
+**Coverage:**
+- ✅ All status combinations (4x4 matrix: ONLINE, AWAY, BUSY, OFFLINE)
+- ✅ OFFLINE connection priority (always wins)
+- ✅ ONLINE default behavior (returns connection status)
+- ✅ Non-ONLINE default behavior (returns default)
+- ✅ Deterministic behavior verification
+- ✅ Pure function validation (no side effects)
+- ✅ Two-rule logic structure validation
+- ✅ User preference scenarios
+- ✅ Contradiction handling (user wants OFFLINE but is connected)
+
+### 3. `ee/packages/presence/src/lib/processConnectionStatus.ts`
+**Existing file - unchanged but additional tests added**
+
+**Test File:** `ee/packages/presence/tests/lib/processConnectionStatus.test.ts`
+
+**New Coverage Added:**
+- ✅ All possible status combinations (4x4 matrix)
+- ✅ Transitivity of status precedence
+- ✅ Commutativity for same values
+- ✅ Associativity property
+- ✅ Reduce operation behavior
+- ✅ Different orderings produce consistent results
+- ✅ Empty array handling
+- ✅ Single element arrays
+- ✅ Mathematical properties validation
+
+### 4. `packages/models/src/models/UsersSessions.ts`
+**Modified: `updateConnectionStatusById` method now accepts optional status parameter**
+
+**Test File:** `packages/models/tests/UsersSessions.test.ts` (NEW)
+
+**Coverage:**
+- ✅ Update with status provided
+- ✅ Update with status undefined
+- ✅ Update with status parameter omitted
+- ✅ Empty string status (falsy value)
+- ✅ All valid status values (online, away, busy, offline)
+- ✅ Positional operator usage (MongoDB `$` operator)
+- ✅ Date object creation for each call
+- ✅ Database error handling
+- ✅ Return value validation
+- ✅ Special characters in userId and connectionId
+- ✅ Modified count scenarios
+- ✅ Timestamp always updated regardless of status parameter
+
+### 5. `apps/meteor/client/meteor/overrides/ddpOverREST.ts`
+**Modified: Added type guard and ping message handling**
+
+**Test File:** `apps/meteor/tests/unit/client/meteor/overrides/ddpOverREST.test.ts` (NEW)
+
+**Coverage:**
+- ✅ Type discrimination (ping vs method messages)
+- ✅ Login with resume token detection
+- ✅ Login without resume token
+- ✅ UserPresence method identification
+- ✅ Bypass methods identification (setUserStatus, logout)
+- ✅ Stream methods identification (stream-*)
+- ✅ Regular methods that should not bypass
+- ✅ Type narrowing behavior
+- ✅ Property preservation after type guards
+- ✅ Edge cases:
+  - Empty params array
+  - Null in params
+  - Falsy resume values (empty string, null, undefined, 0, false)
+  - Special characters in method names
+  - Case-sensitive matching
+  - Very long method names
+- ✅ Ping message differentiation
+- ✅ UserPresence:ping trigger logic
+
+## Test Statistics
+
+### Total Test Files Created/Modified: 5
+- 3 Modified existing test files with additional tests
+- 2 New test files created
+
+### Total Test Cases Added: 100+
+- processPresenceAndStatus: 50+ test cases
+- processStatus: 15+ test cases
+- processConnectionStatus: 15+ test cases
+- UsersSessions: 15+ test cases
+- ddpOverREST: 20+ test cases
+
+### Coverage Areas:
+1. **Happy Paths**: All normal operation scenarios
+2. **Edge Cases**: Boundary conditions, empty inputs, null/undefined
+3. **Error Conditions**: Database errors, invalid inputs
+4. **Integration**: Multiple components working together
+5. **Mathematical Properties**: Commutativity, associativity, transitivity
+6. **Time-Based Logic**: Exact boundaries, clock skew, staleness
+7. **Type Safety**: Type guards, type narrowing, union types
+8. **Pure Functions**: Deterministic behavior, no side effects
+
+## Testing Framework
+- **Framework**: Jest (v30.2.0)
+- **Language**: TypeScript (v5.9.3)
+- **Assertion Style**: expect/toBe/toEqual/toStrictEqual
+
+## Key Testing Principles Applied
+
+1. **Comprehensive Coverage**: Test all possible input combinations
+2. **Boundary Testing**: Test exact boundaries and edge cases
+3. **Property-Based Testing**: Validate mathematical properties
+4. **Isolation**: Each function tested independently
+5. **Clarity**: Descriptive test names explaining what is tested
+6. **Maintainability**: Tests follow existing project patterns
+7. **Determinism**: All tests produce consistent results
+8. **Real-World Scenarios**: Tests reflect actual usage patterns
+
+## Running the Tests
+
+```bash
+# Run all presence tests
+cd ee/packages/presence
+yarn test
+
+# Run specific test file
+yarn test processPresenceAndStatus.test.ts
+
+# Run with coverage
+yarn test --coverage
+
+# Run models tests
+cd packages/models
+yarn test UsersSessions.test.ts
+
+# Run client tests
+cd apps/meteor
+yarn test ddpOverREST.test.ts
+```
+
+## Notes
+
+- All tests follow the existing project testing patterns and conventions
+- Tests use the same imports and structure as existing tests in the repository
+- Mock implementations are provided where external dependencies exist
+- Tests are designed to be fast and deterministic
+- No external services or databases are required for test execution
+- Tests validate both positive and negative scenarios
+- Type safety is maintained throughout all test implementations