Ensure calculator factors are explicit

tests/test_gauss_to_oersted_conversion_rate.py

@@ -9,6 +9,9 @@ CONVERSION_RATE_UTIL = ROOT / "hdyc-svelte" / "src" / "lib" / "utils" / "convers
 CATEGORY_PAGE = ROOT / "hdyc-svelte" / "src" / "routes" / "category" / "[category]" / "+page.svelte"
 CALCULATOR_COMPONENT = ROOT / "hdyc-svelte" / "src" / "lib" / "components" / "Calculator.svelte"
 TARGET_SLUG = "gauss-to-oersted"
+NON_APPLICABLE_TWO_INPUT_STANDARD_SLUGS = {
+    "grams-per-liter-to-molarity",
+}
 
 
 def _extract_calculator_block(slug: str) -> str:
@@ -38,6 +41,28 @@ class GaussToOerstedConversionRateRegressionTests(unittest.TestCase):
         self.assertIn("conversionRateText = getConversionRateText(config)", calculator_component_text)
         self.assertIn('<span class="formula-hint">', calculator_component_text)
 
+    def test_all_applicable_two_input_standard_calculators_have_factors(self) -> None:
+        missing_factors: list[str] = []
+        for line in CALCULATORS_TS.read_text(encoding="utf-8").splitlines():
+            if '"type": "standard"' not in line:
+                continue
+            if '"labels": {"in1":' not in line or '"in2":' not in line or '"in3":' in line:
+                continue
+            slug_match = re.search(r'"slug": "([^"]+)"', line)
+            if not slug_match:
+                continue
+            slug = slug_match.group(1)
+            if slug in NON_APPLICABLE_TWO_INPUT_STANDARD_SLUGS:
+                continue
+            if '"factor":' not in line:
+                missing_factors.append(slug)
+
+        self.assertEqual(
+            missing_factors,
+            [],
+            f"Two-input standard calculators missing factors (and therefore conversion-rate text): {missing_factors}",
+        )
+
 
 if __name__ == "__main__":
     unittest.main()