Add unit tests for session.in_scope

tests/unit_tests/categories/test_session.py

@@ -1,4 +1,4 @@
-from app.categories.constants import Category, HOUSING
+from app.categories.constants import Category, HOUSING, EDUCATION
 from app.categories.models import CategoryAnswer
 
 
@@ -99,3 +99,28 @@ def test_set_category_dataclass(app, client):
         session["category"] = {"code": EDUCATION.code}
         assert session.category == EDUCATION
         assert isinstance(session.category, Category)
+
+
+def test_in_scope(client):
+    in_scope_answer = CategoryAnswer(
+        question="What is your favourite mode of transport?",
+        answer_value="bus",
+        answer_label="Bus",
+        next_page="categories.index",
+        question_page="categories.housing.homelessness",
+        category=HOUSING.sub.homelessness,
+    )
+    out_scope_answer = CategoryAnswer(
+        question="What is your favourite mode of transport?",
+        answer_value="car",
+        answer_label="Car",
+        next_page="categories.index",
+        question_page="categories.housing.homelessness",
+        category=EDUCATION.sub.child_young_person,
+    )
+    with client.session_transaction() as session:
+        assert session.in_scope is False
+        session.set_category_question_answer(in_scope_answer)
+        assert session.in_scope is True
+        session.set_category_question_answer(out_scope_answer)
+        assert session.in_scope is False