chore(examples): add nested type to tests

This builds on top of the previous commit's fix to ensure that it gets
generated correctly.

Author: Jamie Tanna

examples/output-options/preferskipoptionalpointer/api.yaml

@@ -31,3 +31,9 @@ components:
           description: This field should have an optional pointer, as the field-level definition of `x-go-type-skip-optional-pointer` overrides the `prefer-skip-optional-pointer` Output Option.
           # NOTE that this overrides the global preference
           x-go-type-skip-optional-pointer: false
+    NestedType:
+      type: object
+      properties:
+        client:
+          description: This field is optional, but the `prefer-skip-optional-pointer` Output Option ensures that this should not have an optional pointer.
+          $ref: '#/components/schemas/Client'

examples/output-options/preferskipoptionalpointer/gen.go

@@ -54,6 +54,32 @@ func TestClient(t *testing.T) {
 	})
 }
 
+func TestNestedType(t *testing.T) {
+	t.Run("zero value (empty struct) on Client is not omitted", func(t *testing.T) {
+		nestedType := NestedType{
+			Client: Client{},
+		}
+
+		b, err := json.Marshal(nestedType)
+		require.NoError(t, err)
+
+		assert.True(t, jsonContainsKey(b, "client"))
+	})
+
+	t.Run("value on Client is not omitted", func(t *testing.T) {
+		nestedType := NestedType{
+			Client: Client{
+				Name: "foo",
+			},
+		}
+
+		b, err := json.Marshal(nestedType)
+		require.NoError(t, err)
+
+		assert.True(t, jsonContainsKey(b, "client"))
+	})
+}
+
 // jsonContainsKey checks if the given JSON object contains the specified key at the top level.
 func jsonContainsKey(b []byte, key string) bool {
 	var m map[string]any