feat: add conversational RollCalc assistant

tests/test_template_integration.py

@@ -0,0 +1,44 @@
+from pathlib import Path
+import unittest
+
+
+PROJECT_ROOT = Path(__file__).resolve().parents[1]
+
+
+class TemplatePdfIntegrationTests(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.template = (PROJECT_ROOT / "templates" / "roll_calculator.html").read_text(
+            encoding="utf-8"
+        )
+        cls.pdf_report = (PROJECT_ROOT / "pdf_report.py").read_text(encoding="utf-8")
+
+    def test_ui_uses_the_headless_calculation_result(self):
+        self.assertIn("fetch('/api/calculations/roll'", self.template)
+        self.assertIn("calculation.average_diameter_mm", self.template)
+        self.assertIn("calculation.effective_roll_length_m", self.template)
+        self.assertNotIn("function calculateDiameterResult", self.template)
+
+    def test_optional_weight_requires_both_weight_inputs(self):
+        self.assertIn(
+            "include_roll_weight: width !== null && areaWeight !== null",
+            self.template,
+        )
+
+    def test_pdf_action_starts_disabled_and_posts_structured_result(self):
+        self.assertIn('id="d-pdf" type="button" disabled', self.template)
+        self.assertIn("body: JSON.stringify(window.CURRENT_ROLL_REQUEST)", self.template)
+        self.assertIn("function invalidatePdfReport()", self.template)
+
+    def test_pdf_layout_uses_four_primary_result_cards(self):
+        self.assertIn('"CALCULATION RESULTS"', self.pdf_report)
+        self.assertIn('(("ROLL", "LENGTH"), report["roll_length"]["display"])', self.pdf_report)
+
+    def test_direct_forklift_display_consumes_service_warning_or_note(self):
+        self.assertIn("renderAuthoritativeForkliftResult(authoritativeResult)", self.template)
+        self.assertIn("const warning = result.warnings?.[0]", self.template)
+        self.assertIn("const note = result.notes?.[0]", self.template)
+
+
+if __name__ == "__main__":
+    unittest.main()