feat: add medicine dose graph plotting and toggle functionality with comprehensive tests

TEST_UPDATES_SUMMARY.md

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+# Test Updates for Medicine Dose Plotting Feature
+
+## Overview
+Updated the test suite to accommodate the new medicine dose plotting functionality in the GraphManager class.
+
+## Files Updated
+
+### 1. `/tests/test_graph_manager.py`
+
+#### Updated Tests:
+- **`test_init`**:
+  - Added checks for all 5 medicine toggle variables (bupropion, hydroxyzine, gabapentin, propranolol, quetiapine)
+  - Verified that bupropion and propranolol are enabled by default
+  - Verified that hydroxyzine, gabapentin, and quetiapine are disabled by default
+
+- **`test_toggle_controls_creation`**:
+  - Updated to check for all 9 toggle variables (4 symptoms + 5 medicines)
+
+#### New Test Methods Added:
+- **`test_calculate_daily_dose_empty_input`**: Tests dose calculation with empty/invalid inputs
+- **`test_calculate_daily_dose_standard_format`**: Tests standard timestamp:dose format parsing
+- **`test_calculate_daily_dose_with_symbols`**: Tests parsing with bullet symbols (•)
+- **`test_calculate_daily_dose_no_timestamp`**: Tests parsing without timestamps
+- **`test_calculate_daily_dose_decimal_values`**: Tests decimal dose values
+- **`test_medicine_dose_plotting`**: Tests that medicine doses are plotted correctly
+- **`test_medicine_toggle_functionality`**: Tests that medicine toggles affect dose display
+- **`test_dose_calculation_comprehensive`**: Tests all sample dose data cases
+- **`test_dose_calculation_edge_cases`**: Tests malformed and edge case inputs
+
+### 2. `/tests/conftest.py`
+
+#### Updated Fixtures:
+- **`sample_dataframe`**: Enhanced with realistic dose data:
+  - Added proper dose strings in various formats
+  - Included multiple dose entries per day
+  - Added decimal doses and different timestamp formats
+
+#### New Fixtures:
+- **`sample_dose_data`**: Comprehensive test cases for dose calculation including:
+  - Standard format: `'2025-07-28 18:59:45:150mg|2025-07-28 19:34:19:75mg'`
+  - With bullets: `'• • • • 2025-07-30 07:50:00:300'`
+  - Decimal doses: `'2025-07-28 18:59:45:12.5mg|2025-07-28 19:34:19:7.5mg'`
+  - No timestamp: `'100mg|50mg'`
+  - Mixed format: `'• 2025-07-30 22:50:00:10|75mg'`
+  - Edge cases: empty strings, 'nan' values, no units
+
+## Test Coverage Areas
+
+### Dose Calculation Logic:
+- ✅ Empty/null inputs return 0.0
+- ✅ Standard timestamp:dose format parsing
+- ✅ Multiple dose entries separated by `|`
+- ✅ Bullet symbol (•) handling and removal
+- ✅ Decimal dose values
+- ✅ Doses without timestamps
+- ✅ Doses without units (mg)
+- ✅ Mixed format handling
+- ✅ Malformed data graceful handling
+
+### Graph Plotting:
+- ✅ Medicine dose bars are plotted when toggles are enabled
+- ✅ No plotting occurs when toggles are disabled
+- ✅ No plotting occurs when dose data is empty
+- ✅ Canvas redraw is called appropriately
+- ✅ Axis clearing occurs before plotting
+
+### Toggle Functionality:
+- ✅ All 9 toggle variables are properly initialized
+- ✅ Default states are correct (symptoms on, some medicines on/off)
+- ✅ Toggle changes trigger graph updates
+- ✅ Toggle states affect what gets plotted
+
+## Expected Test Results
+
+### Dose Calculation Examples:
+- `'2025-07-28 18:59:45:150mg|2025-07-28 19:34:19:75mg'` → 225.0mg
+- `'• • • • 2025-07-30 07:50:00:300'` → 300.0mg
+- `'2025-07-28 18:59:45:12.5mg|2025-07-28 19:34:19:7.5mg'` → 20.0mg
+- `'100mg|50mg'` → 150.0mg
+- `'• 2025-07-30 22:50:00:10|75mg'` → 85.0mg
+- `''` → 0.0mg
+- `'nan'` → 0.0mg
+- `'2025-07-28 18:59:45:10|2025-07-28 19:34:19:5'` → 15.0mg
+
+## Running the Tests
+
+To run the updated tests:
+
+```bash
+# Run all graph manager tests
+.venv/bin/python -m pytest tests/test_graph_manager.py -v
+
+# Run specific dose calculation tests
+.venv/bin/python -m pytest tests/test_graph_manager.py -k "dose_calculation" -v
+
+# Run all tests with coverage
+.venv/bin/python -m pytest tests/ --cov=src --cov-report=html
+```
+
+## Notes
+
+- All tests are designed to work with mocked matplotlib components to avoid GUI dependencies
+- Tests use the existing fixture system and follow established patterns
+- New functionality is thoroughly covered while maintaining backward compatibility
+- Edge cases and error conditions are properly tested