Initial commit: CMM Report Analyzer

FastAPI app that parses CMM inspection reports (PDF/Excel/CSV),
computes SPC metrics (Cp/Cpk/Pp/Ppk, control limits, Shapiro-Wilk),
generates interactive Plotly charts, and provides AI-powered quality
summaries via Azure OpenAI with graceful fallback.

Includes 21 passing tests covering parsers, SPC calculations, and
API endpoints.

tests/test_api.py

@@ -0,0 +1,72 @@
+import io
+import tempfile
+from pathlib import Path
+
+import pandas as pd
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+from app.main import app
+
+
+@pytest.fixture
+def sample_excel() -> bytes:
+    df = pd.DataFrame({
+        "Feature Name": ["D1", "D1", "D1", "D2", "D2", "D2"],
+        "Nominal": [10.0, 10.0, 10.0, 20.0, 20.0, 20.0],
+        "Actual": [10.02, 9.99, 10.01, 20.05, 19.97, 20.02],
+        "Tol+": [0.05, 0.05, 0.05, 0.10, 0.10, 0.10],
+        "Tol-": [-0.05, -0.05, -0.05, -0.10, -0.10, -0.10],
+    })
+    buf = io.BytesIO()
+    df.to_excel(buf, index=False)
+    buf.seek(0)
+    return buf.read()
+
+
+@pytest.mark.asyncio
+async def test_upload_and_results(sample_excel):
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as client:
+        resp = await client.post(
+            "/api/upload",
+            files=[("files", ("test.xlsx", sample_excel, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"))],
+        )
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "batch_id" in data
+
+        resp2 = await client.get(f"/api/results/{data['batch_id']}")
+        assert resp2.status_code == 200
+        result = resp2.json()
+        assert result["status"] == "complete"
+        assert len(result["files"]) == 1
+        assert result["files"][0]["filename"] == "test.xlsx"
+        assert len(result["files"][0]["spc"]) == 2  # D1 and D2
+
+
+@pytest.mark.asyncio
+async def test_upload_no_files():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as client:
+        resp = await client.post("/api/upload", files=[])
+        assert resp.status_code in (400, 422)
+
+
+@pytest.mark.asyncio
+async def test_upload_unsupported_type():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as client:
+        resp = await client.post(
+            "/api/upload",
+            files=[("files", ("test.png", b"fake", "image/png"))],
+        )
+        assert resp.status_code == 400
+
+
+@pytest.mark.asyncio
+async def test_results_not_found():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as client:
+        resp = await client.get("/api/results/nonexistent")
+        assert resp.status_code == 404