add more sample inputs and unit tests

samples/input2.json

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+{
+  "weather": {
+    "temperature": 25,
+    "humidity": 60.5,
+    "wind_speed": 10.2
+  },
+  "traffic_flow": {
+    "average_speed": 45.5,
+    "traffic_density": [0.3, 0.5, 0.7],
+    "incident_reports": 2
+  },
+  "road_condition": {
+    "road_quality": 8,
+    "lighting_conditions": 9,
+    "accident_history": 1
+  }
+}

samples/input3.json

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+{
+  "weather": {
+    "temperature": -5,
+    "humidity": 90.5,
+    "wind_speed": 25.0
+  },
+  "traffic_flow": {
+    "average_speed": 10.5,
+    "traffic_density": [0.95, 0.98, 0.99],
+    "incident_reports": 10
+  },
+  "road_condition": {
+    "road_quality": 2,
+    "lighting_conditions": 3,
+    "accident_history": 7
+  }
+}

tests/unit/test_calculators.py

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+from src.calculators import (
+    calculate_comfort_index,
+    calculate_traffic_flow_efficiency,
+    calculate_safety_score,
+    calculate_overall_commute_quality_score,
+)
+
+
+def test_calculate_comfort_index():
+    assert calculate_comfort_index(25, 60) == 45
+    assert calculate_comfort_index(30, 70, 10) == 25
+    assert calculate_comfort_index(20, 50, 5) == 57.5
+
+
+def test_calculate_traffic_flow_efficiency():
+    assert calculate_traffic_flow_efficiency(60, [0.5, 0.3, 0.2]) == 30.0
+    assert calculate_traffic_flow_efficiency(50, [0.4, 0.4, 0.2], 2) == 21
+    assert calculate_traffic_flow_efficiency(40, [0.1, 0.1], 0) == 33.333333333333336
+
+
+def test_calculate_safety_score():
+    assert calculate_safety_score(8, 7, 2, 50, [0.3, 0.4, 0.3]) == 353.6666666666667
+    assert calculate_safety_score(9, 8, 1, 60, [0.2, 0.2, 0.1], 3, 5) == 478.5
+    assert calculate_safety_score(7, 6, 3, 40, [0.5, 0.5], 1) == 241.75
+
+
+def test_calculate_overall_commute_quality_score():
+    assert calculate_overall_commute_quality_score(45, 60, 120) == 75
+    assert calculate_overall_commute_quality_score(25, 21, 472) == 172.66666666666666