test(reports): add ReportEngine unit tests [FASE-2.1]

Stub WeasyPrint for CI-friendly PDF generation and verify HTML render, PDF path, and HTML file output.
2026-05-18 14:00:37 +02:00
parent 0d4c404f08
commit c28a47c43b
2 changed files with 67 additions and 0 deletions
--- a/backend/app/services/report_engine.py
+++ b/backend/app/services/report_engine.py
@@ -76,6 +76,10 @@ class ReportEngine:
        logger.info("DOCX generated: %s", output_path)
        return output_path

+    def generate_html(self, template_name: str, context: dict) -> str:
+        """Render and save a standalone HTML report (alias for spec compatibility)."""
+        return self.generate_html_file(template_name, context)
+
    def generate_html_file(self, template_name: str, context: dict) -> str:
        """Render and save a standalone HTML report."""
        html_content = self.render_html(template_name, context)
--- a/backend/tests/test_report_engine.py
+++ b/backend/tests/test_report_engine.py
@@ -0,0 +1,63 @@
+"""Report engine unit tests (FASE-2.1)."""
+
+import os
+import sys
+from unittest.mock import MagicMock
+
+import pytest
+
+from app.services.report_engine import ReportEngine
+
+
+@pytest.fixture
+def engine(tmp_path, monkeypatch):
+    templates = tmp_path / "templates"
+    styles = templates / "styles"
+    styles.mkdir(parents=True)
+    (styles / "report.css").write_text("body { color: #0e7490; }", encoding="utf-8")
+    (templates / "coverage_report.html").write_text(
+        "<html><body><h1>{{ company_name }}</h1><p>{{ score }}</p></body></html>",
+        encoding="utf-8",
+    )
+    out_dir = tmp_path / "out"
+    monkeypatch.setattr("app.services.report_engine.settings.REPORT_TEMPLATES_DIR", str(templates))
+    monkeypatch.setattr("app.services.report_engine.settings.REPORT_OUTPUT_DIR", str(out_dir))
+    monkeypatch.setattr("app.services.report_engine.settings.COMPANY_NAME", "Test Org")
+    return ReportEngine()
+
+
+def test_render_html_injects_company_and_timestamp(engine):
+    html = engine.render_html("coverage_report", {"score": 42})
+    assert "Test Org" in html
+    assert "42" in html
+
+
+def test_generate_pdf_writes_file(engine, monkeypatch, tmp_path):
+    """WeasyPrint is stubbed so tests run without GTK/Pango system libraries."""
+    def _write_pdf(output_path, stylesheets=None):
+        with open(output_path, "wb") as f:
+            f.write(b"%PDF-1.4 mock")
+
+    mock_html_instance = MagicMock()
+    mock_html_instance.write_pdf.side_effect = _write_pdf
+    mock_wp = MagicMock()
+    mock_wp.HTML.return_value = mock_html_instance
+    mock_wp.CSS = MagicMock()
+    for key in list(sys.modules):
+        if key == "weasyprint" or key.startswith("weasyprint."):
+            monkeypatch.delitem(sys.modules, key, raising=False)
+    monkeypatch.setitem(sys.modules, "weasyprint", mock_wp)
+
+    path = engine.generate_pdf("coverage_report", {"score": 99})
+
+    assert path.endswith(".pdf")
+    assert os.path.isfile(path)
+    mock_html_instance.write_pdf.assert_called_once()
+
+
+def test_generate_html_file_writes_file(engine):
+    path = engine.generate_html("coverage_report", {"score": 7})
+    assert path.endswith(".html")
+    assert os.path.isfile(path)
+    with open(path, encoding="utf-8") as f:
+        assert "Test Org" in f.read()