Add NavRootRecursive and NavParentRecursive tests

See kaitai-io/kaitai_struct#1089

formats/nav_parent_recursive.ksy

@@ -0,0 +1,15 @@
+# Tests that `_parent` is passed to recursive invocations of the top-level type
+#
+# See https://github.com/kaitai-io/kaitai_struct/issues/1089
+meta:
+  id: nav_parent_recursive
+seq:
+  - id: value
+    type: u1
+  - id: next
+    type: nav_parent_recursive
+    if: value == 0xff
+instances:
+  parent_value:
+    value: _parent.as<nav_parent_recursive>.value
+    if: value != 0xff

formats/nav_root_recursive.ksy

@@ -0,0 +1,14 @@
+# Tests that `_root` is passed to recursive invocations of the top-level type
+#
+# See https://github.com/kaitai-io/kaitai_struct/issues/1089
+meta:
+  id: nav_root_recursive
+seq:
+  - id: value
+    type: u1
+  - id: next
+    type: nav_root_recursive
+    if: value == 0xff
+instances:
+  root_value:
+    value: _root.value

spec/ks/nav_parent_recursive.kst

@@ -0,0 +1,13 @@
+id: nav_parent_recursive
+data: enum_negative.bin
+asserts:
+  - actual: value
+    expected: 0xff
+
+  - actual: next.value
+    expected: 1
+  - actual: next.parent_value
+    expected: 0xff
+
+  - actual: next.next
+    expected: 'null'

spec/ks/nav_root_recursive.kst

@@ -0,0 +1,13 @@
+id: nav_root_recursive
+data: enum_negative.bin
+asserts:
+  - actual: value
+    expected: 0xff
+
+  - actual: next.value
+    expected: 1
+  - actual: next.root_value
+    expected: 0xff
+
+  - actual: next.next
+    expected: 'null'