diff --git a/tests/unit/test_edsnlp_drugs_static.py b/tests/unit/test_edsnlp_drugs_static.py
index 0e9f8f5..c3f58f2 100644
--- a/tests/unit/test_edsnlp_drugs_static.py
+++ b/tests/unit/test_edsnlp_drugs_static.py
@@ -111,3 +111,45 @@ def test_data_source_matches_package_source(monkeypatch, tmp_path):
     from_package = core._load_edsnlp_drug_names()
 
     assert from_data == from_package
+
+
+def test_corrupted_data_falls_back_to_package(monkeypatch, tmp_path):
+    """Fichier data PRÉSENT mais corrompu + edsnlp DISPONIBLE → fail-safe :
+    retombe sur le package et retourne 4206 (jamais un set partiel/tronqué)."""
+    pytest.importorskip("edsnlp")
+    corrupt = tmp_path / "drugs.json"
+    corrupt.write_text("{ invalide", encoding="utf-8")
+    monkeypatch.setattr(core, "_EDSNLP_DRUGS_DATA_PATH", corrupt)
+
+    result = core._load_edsnlp_drug_names()
+    assert len(result) == EXPECTED_COUNT
+    for name in CONFLICT_NAMES:
+        assert name in result
+
+
+def test_corrupted_data_and_no_package_warns(monkeypatch, tmp_path, caplog):
+    """Fichier data corrompu ET edsnlp INDISPONIBLE → set() vide + log.warning
+    (dégradation rendue visible, pas de silence)."""
+    import builtins
+
+    corrupt = tmp_path / "drugs.json"
+    corrupt.write_text("{ invalide", encoding="utf-8")
+    monkeypatch.setattr(core, "_EDSNLP_DRUGS_DATA_PATH", corrupt)
+
+    _real_import = builtins.__import__
+
+    def _fake_import(name, *args, **kwargs):
+        if name == "edsnlp" or name.startswith("edsnlp."):
+            raise ImportError("edsnlp indisponible (torch-free)")
+        return _real_import(name, *args, **kwargs)
+
+    monkeypatch.setattr(builtins, "__import__", _fake_import)
+
+    with caplog.at_level("WARNING", logger=core.log.name):
+        result = core._load_edsnlp_drug_names()
+
+    assert result == set()
+    assert any(
+        "edsnlp" in rec.message.lower() and rec.levelname == "WARNING"
+        for rec in caplog.records
+    ), "aucun log.warning émis lors de l'échec total (data corrompu + pas de package)"