add test examining the current behavior when `optionalField` are nested and `set` is applied

Current result:

One could think that nested `optionalField`s and `set` would create intermediate
objects as well. However, this is currently not possible, since
 1. the signature of UpdateLens.updated doesn't allow to operate on
    missing parents, which would be necessary to let child lenses
    control the creation of parents.
 2. the combine lens would then have to support it

This test remains here as witness to the current behavior.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/test/scala/cc/spray/json/lenses/JsonLensesSpec.scala b/src/test/scala/cc/spray/json/lenses/JsonLensesSpec.scala
index b115afd..a6a7697 100644
--- a/src/test/scala/cc/spray/json/lenses/JsonLensesSpec.scala
+++ b/src/test/scala/cc/spray/json/lenses/JsonLensesSpec.scala
@@ -124,6 +124,19 @@ class JsonLensesSpec extends Specification with SpecHelpers {
         "create" in {
           """[{"b": 4}, {"c": 5}]""".update((* / 'b.?) ! set(38)) must be_json("""[{"b": 38}, {"c": 5, "b": 38}]""")
         }
+        "create nested (current behavior)" in {
+          // One could think that nested `optionalField`s and `set` would create intermediate
+          // objects as well. However, this is currently not possible, since
+          //  1. the signature of UpdateLens.updated doesn't allow to operate on
+          //     missing parents, which would be necessary to let child lenses
+          //     control the creation of parents.
+          //  2. the combine lens would then have to support it
+          //
+          // This test remains here as witness to the current behavior.
+
+          """[{"b": {}}, {"c": 5}]""".update((* / 'b.? / 'd.?) ! set(38)) must be_json(
+            """[{"b":{"d":38}},{"c":5}]""")
+        }
         "delete some" in {
           def f(i: Int): Option[Int] =
             Some(i).filter(_ % 2 == 0)