lotto-lab: strategy_evolver — EMA/Softmax 가중치 진화 + 스마트 추천

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/tests/test_strategy_evolver.py

@@ -0,0 +1,72 @@
+import sys, os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "app"))
+
+import math
+import pytest
+
+
+def test_calc_draw_score_basic():
+    """세트별 결과 → draw_score 계산"""
+    from strategy_evolver import calc_draw_score
+
+    results = [
+        {"correct": 3, "rank": 5},  # 3/6 + 0.1 = 0.6
+        {"correct": 1, "rank": 0},  # 1/6 + 0 = 0.167
+    ]
+    score = calc_draw_score(results)
+    expected = ((3/6 + 0.1) + (1/6)) / 2
+    assert abs(score - expected) < 0.01
+
+
+def test_calc_draw_score_empty():
+    """빈 결과 → 0"""
+    from strategy_evolver import calc_draw_score
+    assert calc_draw_score([]) == 0.0
+
+
+def test_recalculate_weights_softmax():
+    """EMA → Softmax 가중치 변환"""
+    from strategy_evolver import _softmax_weights
+
+    ema_scores = {
+        "combined": 0.30,
+        "simulation": 0.25,
+        "heatmap": 0.15,
+        "manual": 0.10,
+        "custom": 0.05,
+    }
+    weights = _softmax_weights(ema_scores)
+
+    assert abs(sum(weights.values()) - 1.0) < 0.001
+    assert weights["combined"] > weights["simulation"]
+    assert weights["simulation"] > weights["heatmap"]
+    assert all(w >= 0.049 for w in weights.values())
+
+
+def test_recalculate_weights_min_weight():
+    """한 전략의 EMA가 매우 낮아도 최소 5% 보장"""
+    from strategy_evolver import _softmax_weights
+
+    ema_scores = {
+        "combined": 0.50,
+        "simulation": 0.01,
+        "heatmap": 0.01,
+        "manual": 0.01,
+        "custom": 0.01,
+    }
+    weights = _softmax_weights(ema_scores)
+
+    assert weights["simulation"] >= 0.049
+    assert weights["custom"] >= 0.049
+    assert abs(sum(weights.values()) - 1.0) < 0.001
+
+
+def test_update_ema():
+    """EMA 갱신 공식 검증"""
+    from strategy_evolver import ALPHA
+
+    old_ema = 0.15
+    draw_score = 0.40
+    new_ema = ALPHA * draw_score + (1 - ALPHA) * old_ema
+    expected = 0.3 * 0.40 + 0.7 * 0.15  # = 0.225
+    assert abs(new_ema - expected) < 0.001