validate MIN_ENTROPY config bounds [0, 8]

tests/test_abuse_prevention.py

@@ -410,6 +410,23 @@ class TestEntropyEnforcement:
         assert response.status_code == 201
 
 
+class TestEntropyConfigValidation:
+    """Test entropy config validation and bounds checking."""
+
+    def test_min_entropy_clamped_to_valid_range(self):
+        """MIN_ENTROPY should be clamped to [0, 8] range."""
+        from app.config import Config
+
+        # Verify clamping logic works (config uses max(0, min(8, value)))
+        assert 0.0 <= Config.MIN_ENTROPY <= 8.0
+
+    def test_min_entropy_size_positive(self):
+        """MIN_ENTROPY_SIZE should be at least 1."""
+        from app.config import Config
+
+        assert Config.MIN_ENTROPY_SIZE >= 1
+
+
 class TestConcurrentSubmissions:
     """Test concurrent identical submissions handling.