Refacto du code coté Python, java et coté angular afin de mieux séparer les responsabilité et d'avoir moins de répétitivité dans le code.

Mise en place de tests unitaires coté Python et Angular
Mise en place de la couverture de test directement dans le workflow : le programme ne build pas si jamais un test échoue
Passage en v0.16.2 en conséquence

brain/tests/test_import_use_cases.py

@@ -0,0 +1,157 @@
+"""Tests des use cases d'import via FAKES (ports LLM + extracteur PDF).
+
+Exerce la chaîne map-reduce complète (extraction → chunking → MAP → REDUCE →
+streaming d'événements) SANS réseau ni vrai PDF. `chunk_text` est monkeypatché
+pour un découpage déterministe (le chunking est testé à part). `asyncio.sleep`
+est neutralisé pour que les backoffs de retry n'imposent aucune attente.
+"""
+from __future__ import annotations
+
+import pytest
+
+from app.application.import_campaign import ImportCampaignUseCase
+from app.application.import_rules import ImportRulesUseCase
+from app.domain.models import ExtractedDocument, ExtractedPage
+from app.domain.ports import LLMProviderError
+
+
+# --- fakes ---------------------------------------------------------------------
+
+class FakeExtractor:
+    def __init__(self, doc: ExtractedDocument) -> None:
+        self._doc = doc
+
+    def extract(self, pdf_bytes: bytes) -> ExtractedDocument:
+        return self._doc
+
+
+class ScriptedLLM:
+    """Rejoue une réponse par appel (la dernière est répétée si on dépasse)."""
+
+    def __init__(self, responses: list) -> None:
+        self._responses = list(responses)
+        self.calls = 0
+
+    async def generate(self, prompt: str, *, output_format=None, temperature=None) -> str:
+        r = self._responses[min(self.calls, len(self._responses) - 1)]
+        self.calls += 1
+        if isinstance(r, Exception):
+            raise r
+        return r
+
+
+class ContentLLM:
+    """Répond selon le CONTENU du prompt (chunk) : (sous-chaîne → réponse/exception)."""
+
+    def __init__(self, rules: list) -> None:
+        self._rules = rules
+
+    async def generate(self, prompt: str, *, output_format=None, temperature=None) -> str:
+        for sub, r in self._rules:
+            if sub in prompt:
+                if isinstance(r, Exception):
+                    raise r
+                return r
+        raise AssertionError(f"aucune règle ContentLLM ne matche : {prompt[:60]!r}")
+
+
+def _doc(text: str = "Texte du PDF.", *, ocr: bool = False) -> ExtractedDocument:
+    return ExtractedDocument(pages=[ExtractedPage(index=0, text=text, used_ocr=ocr)])
+
+
+@pytest.fixture
+def no_sleep(monkeypatch):
+    async def _noop(_d):
+        return None
+    monkeypatch.setattr("asyncio.sleep", _noop)
+
+
+@pytest.fixture
+def one_chunk(monkeypatch):
+    monkeypatch.setattr("app.application.import_rules.chunk_text", lambda *a, **k: ["chunk"])
+    monkeypatch.setattr("app.application.import_campaign.chunk_text", lambda *a, **k: ["chunk"])
+
+
+# --- import de règles ----------------------------------------------------------
+
+async def test_rules_execute_returns_merged_sections(one_chunk):
+    llm = ScriptedLLM(['{"Combat":"## Combat\\nrègles de combat"}'])
+    uc = ImportRulesUseCase(llm, FakeExtractor(_doc(ocr=True)))
+    result = await uc.execute(b"pdf")
+    assert result.sections == {"Combat": "## Combat\nrègles de combat"}
+    assert result.page_count == 1
+    assert result.ocr_page_count == 1
+
+
+async def test_rules_stream_emits_extracting_start_progress_done(one_chunk):
+    llm = ScriptedLLM(['{"Magie":"sorts"}'])
+    uc = ImportRulesUseCase(llm, FakeExtractor(_doc()))
+    events = [e async for e in uc.stream(b"pdf")]
+    types = [e["type"] for e in events]
+    assert types[0] == "extracting"
+    assert types[1] == "start"
+    assert "progress" in types
+    done = events[-1]
+    assert done["type"] == "done"
+    assert done["sections"] == {"Magie": "sorts"}
+
+
+async def test_rules_stream_skips_failed_chunk_but_continues(monkeypatch, no_sleep):
+    monkeypatch.setattr("app.application.import_rules.chunk_text",
+                        lambda *a, **k: ["AAA premier", "BBB second"])
+    llm = ContentLLM([
+        ("AAA premier", LLMProviderError("HTTP 503 saturé")),
+        ("BBB second", '{"Magie":"sorts"}'),
+    ])
+    uc = ImportRulesUseCase(llm, FakeExtractor(_doc()))
+    events = [e async for e in uc.stream(b"pdf")]
+    types = [e["type"] for e in events]
+    assert "chunk_failed" in types
+    done = events[-1]
+    assert done["type"] == "done"
+    assert done["sections"] == {"Magie": "sorts"}
+    assert done["skipped"] == 1
+
+
+async def test_rules_stream_all_chunks_fail_emits_error(one_chunk, no_sleep):
+    llm = ScriptedLLM([LLMProviderError("HTTP 500 panne")])
+    uc = ImportRulesUseCase(llm, FakeExtractor(_doc()))
+    events = [e async for e in uc.stream(b"pdf")]
+    assert events[-1]["type"] == "error"
+    assert "échoué" in events[-1]["message"]
+
+
+# --- import de campagne --------------------------------------------------------
+
+_TREE = ('{"arcs":[{"name":"Acte I","description":"intro",'
+         '"chapters":[{"name":"Ch1","scenes":[{"name":"Sc1"}]}]}],'
+         '"npcs":[{"name":"Gandalf","description":"magicien"}]}')
+
+
+async def test_campaign_execute_builds_tree_and_npcs(one_chunk):
+    uc = ImportCampaignUseCase(ScriptedLLM([_TREE]), FakeExtractor(_doc()))
+    result = await uc.execute(b"pdf")
+    assert result.counts() == (1, 1, 1)
+    assert result.arcs[0].name == "Acte I"
+    assert result.arcs[0].chapters[0].scenes[0].name == "Sc1"
+    assert [n.name for n in result.npcs] == ["Gandalf"]
+
+
+async def test_campaign_stream_emits_done_with_serialized_tree(one_chunk):
+    uc = ImportCampaignUseCase(ScriptedLLM([_TREE]), FakeExtractor(_doc()))
+    events = [e async for e in uc.stream(b"pdf")]
+    types = [e["type"] for e in events]
+    assert types[0] == "extracting"
+    assert types[1] == "start"
+    assert "progress" in types
+    done = events[-1]
+    assert done["type"] == "done"
+    assert done["arcs"][0]["name"] == "Acte I"
+    assert done["arcs"][0]["chapters"][0]["scenes"][0]["name"] == "Sc1"
+    assert done["npcs"] == [{"name": "Gandalf", "description": "magicien"}]
+
+
+async def test_campaign_stream_all_fail_emits_error(one_chunk, no_sleep):
+    uc = ImportCampaignUseCase(ScriptedLLM([LLMProviderError("502")]), FakeExtractor(_doc()))
+    events = [e async for e in uc.stream(b"pdf")]
+    assert events[-1]["type"] == "error"