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_parsers.py

@@ -0,0 +1,90 @@
+import tempfile
+from pathlib import Path
+
+import pandas as pd
+
+from app.parsers.base import get_parser, match_column
+from app.parsers.excel_parser import ExcelParser
+from app.parsers.models import MeasurementRecord
+
+
+def test_match_column_nominal():
+    assert match_column("Nominal") == "nominal"
+    assert match_column("NOM") == "nominal"
+    assert match_column("Target Value") == "nominal"
+
+
+def test_match_column_actual():
+    assert match_column("Actual") == "actual"
+    assert match_column("Measured") == "actual"
+
+
+def test_match_column_unknown():
+    assert match_column("random_xyz") is None
+
+
+def test_get_parser_pdf():
+    p = get_parser("report.pdf")
+    from app.parsers.pdf_parser import PDFParser
+    assert isinstance(p, PDFParser)
+
+
+def test_get_parser_excel():
+    p = get_parser("data.xlsx")
+    assert isinstance(p, ExcelParser)
+
+
+def test_get_parser_csv():
+    p = get_parser("data.csv")
+    assert isinstance(p, ExcelParser)
+
+
+def test_get_parser_unsupported():
+    try:
+        get_parser("image.png")
+        assert False, "Should have raised"
+    except ValueError:
+        pass
+
+
+def test_measurement_record_properties():
+    rec = MeasurementRecord(
+        feature_name="D1",
+        nominal=10.0,
+        tolerance_plus=0.05,
+        tolerance_minus=-0.05,
+        actual=10.02,
+    )
+    assert rec.usl == 10.05
+    assert rec.lsl == 9.95
+    assert rec.in_tolerance is True
+
+
+def test_measurement_record_out_of_tolerance():
+    rec = MeasurementRecord(
+        feature_name="D1",
+        nominal=10.0,
+        tolerance_plus=0.05,
+        tolerance_minus=-0.05,
+        actual=10.10,
+    )
+    assert rec.in_tolerance is False
+
+
+def test_excel_parser_with_standard_headers():
+    df = pd.DataFrame({
+        "Feature Name": ["D1", "D2", "D3"],
+        "Nominal": [10.0, 20.0, 30.0],
+        "Actual": [10.02, 19.98, 30.05],
+        "Tol+": [0.05, 0.10, 0.10],
+        "Tol-": [-0.05, -0.10, -0.10],
+    })
+    with tempfile.NamedTemporaryFile(suffix=".xlsx", delete=False) as f:
+        df.to_excel(f.name, index=False)
+        parser = ExcelParser()
+        report = parser.parse(Path(f.name))
+
+    assert len(report.measurements) == 3
+    assert report.measurements[0].feature_name == "D1"
+    assert report.measurements[0].nominal == 10.0
+    assert report.measurements[0].actual == 10.02