diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..991a31d
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,22 @@
+[build-system]
+requires = ["setuptools>=68.0"]
+build-backend = "setuptools.backends._legacy:_Backend"
+
+[project]
+name = "t2a"
+version = "2.0.0"
+requires-python = ">=3.12"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "--strict-markers -x -q"
+markers = ["integration: tests requiring Ollama"]
+
+[tool.coverage.run]
+source = ["src"]
+omit = ["src/viewer/templates/*"]
+
+[tool.coverage.report]
+fail_under = 55
+show_missing = true
+exclude_lines = ["pragma: no cover", "if __name__", "except ImportError"]
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..c2b3c09
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,3 @@
+-r requirements.txt
+pytest-cov>=4.1.0
+pytest-xdist>=3.5.0
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..325f575
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,80 @@
+"""Fixtures partagées pour les tests T2A."""
+
+from __future__ import annotations
+
+import pytest
+
+from src.config import (
+    ActeCCAM,
+    Antecedent,
+    BiologieCle,
+    Complication,
+    ControleCPAM,
+    Diagnostic,
+    DossierMedical,
+    Imagerie,
+    Sejour,
+    Traitement,
+)
+
+
+@pytest.fixture
+def dossier_minimal() -> DossierMedical:
+    """Dossier médical minimal : DP seul, pas de DAS/bio/imagerie."""
+    return DossierMedical(
+        source_file="test_minimal.pdf",
+        document_type="crh",
+        sejour=Sejour(sexe="M", age=65, duree_sejour=5),
+        diagnostic_principal=Diagnostic(
+            texte="Cholécystite aiguë",
+            cim10_suggestion="K81.0",
+        ),
+    )
+
+
+@pytest.fixture
+def dossier_complet() -> DossierMedical:
+    """Dossier médical enrichi : DP + DAS + bio + imagerie + traitements."""
+    return DossierMedical(
+        source_file="test_complet.pdf",
+        document_type="crh",
+        sejour=Sejour(sexe="M", age=65, duree_sejour=5, imc=31.2),
+        diagnostic_principal=Diagnostic(
+            texte="Cholécystite aiguë",
+            cim10_suggestion="K81.0",
+        ),
+        diagnostics_associes=[
+            Diagnostic(texte="Iléus réflexe", cim10_suggestion="K56.0"),
+        ],
+        actes_ccam=[
+            ActeCCAM(texte="Cholécystectomie", code_ccam_suggestion="HMFC004"),
+        ],
+        biologie_cle=[
+            BiologieCle(test="CRP", valeur="180", anomalie=True),
+            BiologieCle(test="Créatinine", valeur="450", anomalie=True),
+        ],
+        imagerie=[
+            Imagerie(type="Scanner abdominal", conclusion="Lithiase cholédocienne confirmée"),
+        ],
+        traitements_sortie=[
+            Traitement(medicament="Augmentin IV", posologie="3g/j"),
+            Traitement(medicament="Morphine SC"),
+        ],
+        antecedents=[
+            Antecedent(texte="HTA"),
+            Antecedent(texte="Diabète type 2"),
+        ],
+    )
+
+
+@pytest.fixture
+def controle_cpam() -> ControleCPAM:
+    """Contrôle CPAM de test avec codes contestés."""
+    return ControleCPAM(
+        numero_ogc=12345,
+        titre="Contestation du codage CIM-10",
+        arg_ucr="Le codage du DP K81.0 est contesté, proposition K80.2",
+        decision_ucr="Modification du DP",
+        dp_ucr="K80.2",
+        da_ucr="K56.0",
+    )