Prevent more than 1 decimal place in height metric

Author: jamiefalcus

lung_cancer_screening/questions/forms/metric_height_form.py

@@ -11,10 +11,12 @@ def __init__(self, *args, **kwargs):
         self.instance.participant = self.participant
 
         self.fields["height"] = DecimalField(
+            decimal_places=1,
             label="Centimetres",
             classes="nhsuk-input--width-4",
             error_messages={
                 'required': 'Enter your height',
+                "max_decimal_places": "Centimetres must be to 1 decimal place, for example 185.5cm",
             },
             suffix="cm"
         )

lung_cancer_screening/questions/tests/unit/forms/test_metric_height_form.py

@@ -56,3 +56,17 @@ def test_is_invalid(self):
             }
         )
         self.assertFalse(form.is_valid())
+
+    def test_is_invalid_with_multiple_decimal_places(self):
+        form = MetricHeightForm(
+            participant=self.participant,
+            instance=self.response_set,
+            data={
+                "height": "170.45"  # too many decimal places
+            }
+        )
+        self.assertFalse(form.is_valid())
+        self.assertEqual(
+            form.errors["height"],
+            ["Centimetres must be to 1 decimal place, for example 185.5cm"]
+        )