Create test_timeline_formatter.py

tests/test_timeline_formatter.py

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+"""
+Test suite for TimelineFormatter
+
+Tests the formatting and display generation for timeline visualizations.
+"""
+
+import pytest
+from typing import Dict, Any
+
+# Import your formatter (adjust path as needed)
+# from app import TimelineFormatter, TimelineMetrics
+
+
+class TestTimelineFormatter:
+    """Test suite for TimelineFormatter class"""
+    
+    @pytest.fixture
+    def sample_metrics(self):
+        """Create sample TimelineMetrics for testing"""
+        # TODO: Create TimelineMetrics instance with known values
+        pass
+    
+    def test_format_markdown_comparison(self, sample_metrics):
+        """Test markdown comparison formatting"""
+        # TODO: Generate markdown and verify structure
+        # - Should contain both timelines
+        # - Should show costs
+        # - Should include time savings
+        pass
+    
+    def test_markdown_contains_industry_timeline(self, sample_metrics):
+        """Test that markdown includes industry standard timeline"""
+        # TODO: Verify "WITHOUT ARF" section exists
+        # - T+0, T+14, T+28, T+60 markers
+        # - Cost display
+        pass
+    
+    def test_markdown_contains_arf_timeline(self, sample_metrics):
+        """Test that markdown includes ARF timeline"""
+        # TODO: Verify "WITH ARF" section exists
+        # - T+0, T+2, T+3, T+5 markers
+        # - Cost display
+        pass
+    
+    def test_markdown_shows_difference_section(self, sample_metrics):
+        """Test that markdown includes difference section"""
+        # TODO: Verify "THE DIFFERENCE" section
+        # - Time saved
+        # - Cost saved
+        # - Speed multiplier
+        pass
+    
+    def test_format_summary_stats(self, sample_metrics):
+        """Test summary statistics formatting"""
+        # TODO: Verify returns dict with correct keys
+        # - time_saved_minutes
+        # - cost_savings
+        # - speed_multiplier
+        # - time_improvement_pct
+        # - arf_total_time
+        # - industry_total_time
+        pass
+    
+    def test_summary_stats_rounding(self, sample_metrics):
+        """Test that summary stats are rounded appropriately"""
+        # TODO: Verify decimal precision
+        # - Cost should be integer
+        # - Time should be 1 decimal
+        # - Percentage should be 1 decimal
+        pass
+    
+    def test_format_visual_bars(self, sample_metrics):
+        """Test visual bar chart formatting"""
+        # TODO: Generate bars and verify
+        # - Industry bar length
+        # - ARF bar length (proportional)
+        # - Percentage display
+        pass
+    
+    def test_visual_bars_proportional(self, sample_metrics):
+        """Test that visual bars maintain correct proportions"""
+        # TODO: Verify bar lengths are proportional to time
+        pass
+    
+    def test_visual_bars_max_length(self):
+        """Test that visual bars don't exceed max length"""
+        # TODO: Even with extreme values, bars should fit
+        pass
+    
+    def test_format_with_zero_values(self):
+        """Test formatting with edge case values"""
+        # TODO: Handle zero time savings gracefully
+        pass
+    
+    def test_format_with_large_numbers(self):
+        """Test formatting with very large cost savings"""
+        # TODO: Verify comma formatting for readability
+        # - \$1,000,000 not \$1000000
+        pass
+    
+    def test_format_special_characters_escaped(self, sample_metrics):
+        """Test that special markdown characters are escaped"""
+        # TODO: Ensure no markdown injection possible
+        pass
+
+
+class TestTimelineFormatterEdgeCases:
+    """Test edge cases in formatting"""
+    
+    def test_format_negative_time_savings(self):
+        """Test formatting when ARF is slower (shouldn't happen)"""
+        # TODO: Handle gracefully, maybe show "N/A"
+        pass
+    
+    def test_format_very_small_time_differences(self):
+        """Test formatting when times are very close"""
+        # TODO: Should still display clearly
+        pass
+    
+    def test_format_extremely_large_costs(self):
+        """Test formatting multi-million dollar savings"""
+        # TODO: Verify readability with large numbers
+        pass
+    
+    def test_unicode_characters_in_bars(self):
+        """Test that unicode bar characters render correctly"""
+        # TODO: Verify █ character displays properly
+        pass
+
+
+class TestTimelineFormatterIntegration:
+    """Test formatter integration with calculator"""
+    
+    def test_calculator_to_formatter_pipeline(self):
+        """Test complete flow from calculation to formatting"""
+        # TODO: Calculate metrics → Format → Verify output
+        pass
+    
+    def test_multiple_format_calls_consistent(self, sample_metrics):
+        """Test that formatter is deterministic"""
+        # TODO: Same input should always produce same output
+        pass
+    
+    def test_all_format_methods_use_same_metrics(self, sample_metrics):
+        """Test that all format methods work with same metrics object"""
+        # TODO: Verify consistency across formats
+        pass
+
+
+# Parametrized tests for different metric scenarios
+@pytest.mark.parametrize("time_saved,expected_emoji", [
+    (55.0, "⏰"),  # Good savings
+    (30.0, "⏰"),  # Medium savings
+    (5.0, "⏰"),   # Small savings
+])
+def test_format_includes_appropriate_emojis(time_saved, expected_emoji):
+    """Test that formatting includes appropriate visual indicators"""
+    # TODO: Implement parametrized test
+    pass