diff --git a/tests/test_registrator.py b/tests/test_registrator.py
index 4287ca8..079401c 100644
--- a/tests/test_registrator.py
+++ b/tests/test_registrator.py
@@ -1 +1,106 @@
-#
\ No newline at end of file
+import importlib
+import sys
+from datetime import datetime as real_datetime
+
+import logging
+import pytest
+
+
+def import_registrator_safely(monkeypatch):
+    """
+    registrator.py configure logging.basicConfig(filename='/sdsat/logs/..') au top-level.
+    En CI, ce chemin peut ne pas exister et casser l'import.
+    On neutralise basicConfig avant import.
+    """
+    monkeypatch.setattr(logging, "basicConfig", lambda *args, **kwargs: None)
+
+    if "registrator" in sys.modules:
+        del sys.modules["registrator"]
+
+    return importlib.import_module("registrator")
+
+
+def test_get_hostname_success(monkeypatch):
+    registrator = import_registrator_safely(monkeypatch)
+
+    monkeypatch.setattr(registrator.socket, "gethostname", lambda: "my-host")
+    assert registrator.get_hostname() == "my-host"
+
+
+def test_get_hostname_exception(monkeypatch):
+    registrator = import_registrator_safely(monkeypatch)
+
+    def boom():
+        raise Exception("fail")
+
+    monkeypatch.setattr(registrator.socket, "gethostname", boom)
+    assert registrator.get_hostname() is None
+
+
+def test_get_public_ip_success(monkeypatch):
+    registrator = import_registrator_safely(monkeypatch)
+
+    class FakeResp:
+        def json(self):
+            return {"origin": "1.2.3.4"}
+
+    monkeypatch.setattr(registrator.requests, "get", lambda url: FakeResp())
+    assert registrator.get_public_ip() == "1.2.3.4"
+
+
+def test_get_public_ip_multiple_addresses(monkeypatch):
+    registrator = import_registrator_safely(monkeypatch)
+
+    class FakeResp:
+        def json(self):
+            return {"origin": "1.2.3.4, 5.6.7.8"}
+
+    monkeypatch.setattr(registrator.requests, "get", lambda url: FakeResp())
+    assert registrator.get_public_ip() == "1.2.3.4"
+
+
+def test_get_public_ip_exception_returns_fallback(monkeypatch):
+    registrator = import_registrator_safely(monkeypatch)
+
+    def boom(url):
+        raise Exception("network down")
+
+    monkeypatch.setattr(registrator.requests, "get", boom)
+    assert registrator.get_public_ip() == "69.69.69.69"
+
+
+def test_send_to_api_posts_expected_payload(monkeypatch):
+    registrator = import_registrator_safely(monkeypatch)
+
+    # Fixe la date pour un test déterministe
+    class FakeDateTime:
+        @staticmethod
+        def now():
+            return real_datetime(2025, 1, 2, 3, 4, 5)
+
+    monkeypatch.setattr(registrator, "datetime", FakeDateTime)
+
+    captured = {}
+
+    class FakePostResp:
+        status_code = 200
+        text = "OK"
+
+    def fake_post(url, json):
+        captured["url"] = url
+        captured["json"] = json
+        return FakePostResp()
+
+    monkeypatch.setattr(registrator.requests, "post", fake_post)
+
+    registrator.send_to_api("my-host", "8.8.8.8")
+
+    assert captured["url"] == "http://api.sdsat.fr:8000/registrator"
+    assert captured["json"]["host"] == "my-host"
+
+    # IMPORTANT :
+    # Ce test suppose que tu as corrigé registrator.py :
+    #   "IP": IP
+    assert captured["json"]["IP"] == "8.8.8.8"
+
+    assert captured["json"]["Date_registration"] == "2025-01-02T03:04:05"