From 560444b6855c3439812b6b482ef9956d014e74f3 Mon Sep 17 00:00:00 2001
From: Anthon van der Neut <anthon@mnt.org>
Date: Wed, 7 Jun 2017 10:25:29 +0200
Subject: error/warning on duplicate mapping keys

---
 _test/test_anchor.py | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to '_test/test_anchor.py')

diff --git a/_test/test_anchor.py b/_test/test_anchor.py
index 05c8693..fc4a881 100644
--- a/_test/test_anchor.py
+++ b/_test/test_anchor.py
@@ -11,6 +11,7 @@ import platform
 from roundtrip import round_trip, dedent, round_trip_load, round_trip_dump  # NOQA
 from ruamel.yaml.compat import PY3
 from ruamel.yaml.error import ReusedAnchorWarning
+from ruamel.yaml import version_info
 
 
 def load(s):
@@ -325,6 +326,31 @@ class TestMergeKeysValues:
         assert len(x) == ref
 
 
+class TestDuplicateKeyThroughAnchor:
+    def test_duplicate_key_00(self):
+        from ruamel.yaml import safe_load, round_trip_load
+        from ruamel.yaml.constructor import DuplicateKeyFutureWarning, DuplicateKeyError
+        s = dedent("""\
+        &anchor foo:
+            foo: bar
+            *anchor : duplicate key
+            baz: bat
+            *anchor : duplicate key
+        """)
+        if version_info < (0, 15, 1):
+            pass
+        elif version_info < (0, 16, 0):
+            with pytest.warns(DuplicateKeyFutureWarning):
+                safe_load(s)
+            with pytest.warns(DuplicateKeyFutureWarning):
+                round_trip_load(s)
+        else:
+            with pytest.raises(DuplicateKeyError):
+                safe_load(s)
+            with pytest.raises(DuplicateKeyError):
+                round_trip_load(s)
+
+
 class TestFullCharSetAnchors:
     def test_master_of_orion(self):
         # https://bitbucket.org/ruamel/yaml/issues/72/not-allowed-in-anchor-names
-- 
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