append counters when there are multiple cyst items

This is visually hidden, and ensures that we don't have multiple links
close together that are hard to distinguish by users of assistive tech

Author: MatMoore

manage_breast_screening/mammograms/presenters/medical_information_presenter.py

@@ -60,10 +60,15 @@ def __init__(self, appointment):
             BenignLumpHistoryItemPresenter(item)
             for item in appointment.benign_lump_history_items.all()
         ]
-        self.cyst_history = [
-            CystHistoryItemPresenter(item)
-            for item in appointment.cyst_history_items.all()
-        ]
+
+        cyst_history_items = list(appointment.cyst_history_items.all())
+        if len(cyst_history_items) == 1:
+            self.cyst_history = [CystHistoryItemPresenter(cyst_history_items[0])]
+        else:
+            self.cyst_history = [
+                CystHistoryItemPresenter(item, counter=counter)
+                for counter, item in enumerate(cyst_history_items, 1)
+            ]
         self.existing_symptom_type_ids = {
             symptom.symptom_type_id for symptom in symptoms
         }

manage_breast_screening/mammograms/tests/presenters/test_medical_information_presenter.py

@@ -9,6 +9,7 @@
 )
 from manage_breast_screening.participants.tests.factories import (
     AppointmentFactory,
+    CystHistoryItemFactory,
     SymptomFactory,
 )
 
@@ -114,6 +115,28 @@ def test_add_nipple_change_link(self):
             "text": "Add another nipple change",
         }
 
+    def test_cyst_history_items_have_a_counter(self):
+        appointment = AppointmentFactory()
+        CystHistoryItemFactory.create_batch(2, appointment=appointment)
+
+        counters = [
+            item.counter
+            for item in MedicalInformationPresenter(appointment).cyst_history
+        ]
+
+        assert counters == [1, 2]
+
+    def test_single_cyst_history_item_has_no_counter(self):
+        appointment = AppointmentFactory()
+        CystHistoryItemFactory.create(appointment=appointment)
+
+        counters = [
+            item.counter
+            for item in MedicalInformationPresenter(appointment).cyst_history
+        ]
+
+        assert counters == [None]
+
     def test_implanted_medical_device_history_link(self):
         appointment = AppointmentFactory()