Add optional subvalues

1 files changed, 7 insertions, 0 deletions

diff --git a/testing/test_abdl.py b/testing/test_abdl.py
index d28658a..79a0edf 100644
--- a/testing/test_abdl.py
+++ b/testing/test_abdl.py
@@ -262,6 +262,13 @@ def test_empty(foo, pat):
         yield {}
     assert all(LogAndCompare(pat.match(foo), deep(foo)))
 
+def test_optional_value_subtree():
+    pat = abdl.compile("(->foo'foo'?)?(->bar'bar')")
+    matcher = pat.match({'foo': 1, 'bar': 2})
+    assert list(matcher) == [{'foo': ('foo', 1), 'bar': ('bar', 2)}]
+    matcher = pat.match({'bar': 2})
+    assert list(matcher) == [{'bar': ('bar', 2)}]
+
 # FIXME
 #@hypothesis.given(objtree, st.text())
 #def test_exhaustive(foo, pat):