MAESTRO: add engine TDD fixtures and tests

backend/tests/engine/test_analyzer.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from app.engine.analyzer import HeaderAnalyzer
+from app.engine.models import AnalysisRequest, AnalysisResult, TestResult
+
+
+FIXTURES_DIR = Path(__file__).resolve().parents[1] / "fixtures"
+
+
+def test_analyzer_runs_selected_tests_and_reports_progress() -> None:
+    raw_headers = (FIXTURES_DIR / "sample_headers.txt").read_text(encoding="utf-8")
+    request = AnalysisRequest(
+        headers=raw_headers,
+        config={
+            "test_ids": [12, 13],
+            "resolve": False,
+            "decode_all": False,
+        },
+    )
+
+    progress_events: list[tuple[int, int, str]] = []
+
+    def on_progress(current_index: int, total_tests: int, test_name: str) -> None:
+        progress_events.append((current_index, total_tests, test_name))
+
+    analyzer = HeaderAnalyzer()
+    result = analyzer.analyze(request, progress_callback=on_progress)
+
+    assert isinstance(result, AnalysisResult)
+    assert len(result.results) == 2
+    assert [item.test_id for item in result.results] == [12, 13]
+    assert all(isinstance(item, TestResult) for item in result.results)
+
+    assert result.metadata.total_tests == 2
+    assert (
+        result.metadata.passed_tests
+        + result.metadata.failed_tests
+        + result.metadata.skipped_tests
+    ) == result.metadata.total_tests
+
+    assert progress_events
+    assert all(total == 2 for _, total, _ in progress_events)
+    assert progress_events[0][0] == 0
+    assert progress_events[-1][0] == 1

backend/tests/engine/test_parser.py

@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from app.engine.parser import HeaderParser
+
+
+FIXTURES_DIR = Path(__file__).resolve().parents[1] / "fixtures"
+
+
+@pytest.fixture()
+def sample_headers() -> str:
+    return (FIXTURES_DIR / "sample_headers.txt").read_text(encoding="utf-8")
+
+
+def test_parser_extracts_headers_and_preserves_order(sample_headers: str) -> None:
+    parser = HeaderParser()
+    headers = parser.parse(sample_headers)
+
+    assert headers, "Expected parsed headers to be non-empty."
+
+    indices = [header.index for header in headers]
+    assert indices == list(range(len(headers)))
+
+    names = [header.name for header in headers]
+    assert names[:2] == ["Received", "Received"]
+    assert "X-Should-Not-Be-Parsed" not in names
+
+
+def test_parser_handles_folded_lines(sample_headers: str) -> None:
+    parser = HeaderParser()
+    headers = parser.parse(sample_headers)
+
+    subject = next(header for header in headers if header.name == "Subject")
+    assert "folded line" in subject.value
+    assert "\n" in subject.value
+
+    authentication = next(
+        header for header in headers if header.name == "Authentication-Results"
+    )
+    assert "spf=pass" in authentication.value
+    assert "\n" in authentication.value
+
+
+def test_parser_preserves_content_type_boundary(sample_headers: str) -> None:
+    parser = HeaderParser()
+    headers = parser.parse(sample_headers)
+
+    content_type = next(header for header in headers if header.name == "Content-Type")
+    assert "boundary=\"boundary-123\"" in content_type.value

backend/tests/engine/test_scanner_registry.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from app.engine.scanner_registry import ScannerRegistry
+
+
+def test_registry_discovers_all_scanners() -> None:
+    registry = ScannerRegistry()
+    scanners = registry.get_all()
+
+    assert len(scanners) >= 106
+
+    ids = [scanner.id for scanner in scanners]
+    assert len(ids) == len(set(ids))
+    assert {1, 12, 66}.issubset(set(ids))
+
+
+def test_registry_filters_by_ids_and_lists_tests() -> None:
+    registry = ScannerRegistry()
+    selected = registry.get_by_ids([1, 12, 66])
+
+    assert [scanner.id for scanner in selected] == [1, 12, 66]
+
+    tests = registry.list_tests()
+    lookup = {test.id: test for test in tests}
+
+    assert lookup[1].name == "Received - Mail Servers Flow"
+    assert lookup[12].name == "X-Forefront-Antispam-Report"
+    assert lookup[66].name == "X-Proofpoint-Spam-Details"
+
+    assert lookup[1].category
+    assert lookup[12].category
+    assert lookup[66].category

backend/tests/fixtures/sample_headers.txt

@@ -0,0 +1,34 @@
+Received: from mail.example.org (mail.example.org [203.0.113.10])
+    by mx.example.com with ESMTPS id 12345
+    for <user@example.com>; Tue, 17 Feb 2026 10:00:00 +0000
+Received: from localhost (localhost [127.0.0.1])
+    by mail.example.org with SMTP id 67890
+    for <user@example.com>; Tue, 17 Feb 2026 09:59:00 +0000
+Authentication-Results: mx.example.com;
+    spf=pass smtp.mailfrom=example.org;
+    dkim=pass header.d=example.org;
+    dmarc=pass
+Subject: This is a test subject
+    with a folded line
+From: "Sender Name" <sender@example.org>
+To: user@example.com
+Date: Tue, 17 Feb 2026 10:00:00 +0000
+Message-ID: <1234@example.org>
+Content-Type: multipart/alternative; boundary="boundary-123"
+X-Forefront-Antispam-Report: CIP:203.0.113.10;CTRY:US;LANG:en;SCL:1;SRV:;
+    IPV:NLI;SFV:SKI;H:mail.example.org;CAT:NONE;SFTY:0.0;SFS:(0);DIR:INB;
+X-Spam-Status: No, score=-0.1 required=5.0 tests=NONE
+X-Spam-Level: **
+X-Spam-Flag: NO
+X-Spam-Report: Example report line one
+    Example report line two
+X-Mimecast-Spam-Score: 1
+X-Proofpoint-Spam-Details: rule=default, score=0
+X-MS-Exchange-Organization-SCL: 1
+
+--boundary-123
+Content-Type: text/plain; charset=utf-8
+
+This is the body.
+X-Should-Not-Be-Parsed: nope
+--boundary-123--