Implement distribution management API and UI forms; add distribution model and tests

tests/unit/test_distribution.py

@@ -0,0 +1,33 @@
+from fastapi.testclient import TestClient
+from main import app
+from config.database import Base, engine
+from models.distribution import Distribution
+
+# Setup and teardown
+
+
+def setup_module(module):
+    Base.metadata.create_all(bind=engine)
+
+
+def teardown_module(module):
+    Base.metadata.drop_all(bind=engine)
+
+
+client = TestClient(app)
+
+
+def test_create_and_list_distribution():
+    # Create distribution
+    payload = {"name": "NormalDist", "distribution_type": "normal",
+               "parameters": {"mu": 0, "sigma": 1}}
+    resp = client.post("/api/distributions/", json=payload)
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["name"] == "NormalDist"
+
+    # List distributions
+    resp2 = client.get("/api/distributions/")
+    assert resp2.status_code == 200
+    data2 = resp2.json()
+    assert any(d["name"] == "NormalDist" for d in data2)