Keep test for duplicate consecutive keys

See: #1153

Author: WhyNotHugo

tests/unit/utils/test_vobject.py

@@ -364,6 +364,15 @@ def sanity_check(self, c):
 
 TestVobjectMachine = VobjectMachine.TestCase
 
+def test_dupe_consecutive_keys():
+    state = VobjectMachine()
+    unparsed_0 = state.get_unparsed_lines(encoded=False, joined=False)
+    parsed_0 = state.parse(unparsed=unparsed_0)
+    state.add_prop_raw(c=parsed_0, key='0', params=[], value='0')
+    state.add_prop_raw(c=parsed_0, key='0', params=[], value='0')
+    state.add_prop(c=parsed_0, key='0', value='1')
+    state.teardown()
+
 
 def test_component_contains():
     item = vobject._Component.parse(["BEGIN:FOO", "FOO:YES", "END:FOO"])