diff --git a/tests/test_palier6.py b/tests/test_palier6.py
new file mode 100644
index 0000000..51d0405
--- /dev/null
+++ b/tests/test_palier6.py
@@ -0,0 +1,112 @@
+"""Palier 6 (0.9.0): board dynamique sans refresh (issue #15)."""
+
+import re
+
+import app.main as main
+from tests.conftest import csrf_from
+
+
+def _page_counts(html: str) -> dict[str, int]:
+    counts = {}
+    for col, count in re.findall(
+        r'data-column="(\w+)">\s*<div class="column-header".*?column-count[^>]*>(\d+)',
+        html, re.S,
+    ):
+        counts[col] = int(count)
+    return counts
+
+
+def test_api_board_matches_page(client, fake_gitea):
+    page = client.get("/board/Projets/demo")
+    assert page.status_code == 200
+    api = client.get("/api/board/Projets/demo")
+    assert api.status_code == 200
+    data = api.json()
+    assert data["repo"] == "Projets/demo"
+    page_counts = _page_counts(page.text)
+    for col in ("backlog", "todo", "in_progress", "qa", "review", "done"):
+        assert data["columns"][col]["count"] == page_counts[col], col
+    assert "Tâche un" in data["columns"]["backlog"]["html"]
+    assert 'data-issue="1"' in data["columns"]["backlog"]["html"]
+    # Empty column carries the same hint as the server-rendered page.
+    assert "Glissez une carte ici" in data["columns"]["qa"]["html"]
+
+
+def test_api_board_reflects_move(client, fake_gitea):
+    token = csrf_from(client)
+    r = client.post("/api/move", data={
+        "repo_full_name": "Projets/demo", "issue_number": 1,
+        "from_column": "backlog", "to_column": "in_progress",
+        "to_order": "1", "csrf_token": token,
+    })
+    assert r.status_code == 200 and r.json()["ok"]
+    data = client.get("/api/board/Projets/demo").json()
+    assert 'data-issue="1"' in data["columns"]["in_progress"]["html"]
+    # #5 ("Tâche focus", also unplaced) stays in the backlog.
+    assert data["columns"]["backlog"]["count"] == 1
+    assert 'data-issue="5"' in data["columns"]["backlog"]["html"]
+
+
+def test_board_page_uses_board_live_not_live(client, fake_gitea):
+    page = client.get("/board/Projets/demo")
+    assert "/static/js/board-live.js" in page.text
+    assert "/static/js/live.js" not in page.text
+    focus = client.get("/focus")
+    assert "/static/js/live.js" in focus.text  # unchanged elsewhere
+
+
+def test_move_broadcasts_board_changed(client, fake_gitea, monkeypatch):
+    sent = []
+
+    async def record(payload):
+        sent.append(payload)
+
+    monkeypatch.setattr(main.hub, "broadcast", record)
+    token = csrf_from(client)
+    r = client.post("/api/move", data={
+        "repo_full_name": "Projets/demo", "issue_number": 1,
+        "from_column": "backlog", "to_column": "todo",
+        "to_order": "1", "csrf_token": token,
+    })
+    assert r.status_code == 200
+    assert any(
+        p.get("type") == "board-changed" and p.get("repo") == "Projets/demo"
+        for p in sent
+    ), sent
+
+
+def test_create_issue_broadcasts(client, fake_gitea, monkeypatch):
+    sent = []
+
+    async def record(payload):
+        sent.append(payload)
+
+    monkeypatch.setattr(main.hub, "broadcast", record)
+    token = csrf_from(client)
+    r = client.post("/api/issues", data={
+        "repo_full_name": "Projets/demo", "title": "Nouvelle carte live",
+        "column": "backlog", "csrf_token": token,
+    })
+    assert r.status_code == 201
+    assert any(p.get("type") == "board-changed" for p in sent), sent
+
+
+def test_webhook_label_event_broadcasts(client, fake_gitea, monkeypatch):
+    sent = []
+
+    async def record(payload):
+        sent.append(payload)
+
+    monkeypatch.setattr(main.hub, "broadcast", record)
+    r = client.post(
+        "/webhooks/gitea",
+        json={
+            "action": "labeled",
+            "repository": {"full_name": "Projets/demo"},
+            "issue": {"number": 1},
+        },
+        headers={"x-gitea-event": "issues"},
+    )
+    assert r.status_code == 200
+    assert r.json()["ok"] is True
+    assert sent and sent[0]["action"] == "labeled"