tests/internals/yaml.py: Mark test_roundtrip_dump() as failing
This is due to an upstream issue in recent versions of ruamel.yaml:
https://sourceforge.net/p/ruamel-yaml/tickets/390/
diff --git a/tests/internals/yaml.py b/tests/internals/yaml.py
index c710891..452906f 100644
--- a/tests/internals/yaml.py
+++ b/tests/internals/yaml.py
@@ -400,6 +400,11 @@
assert exc.value.reason == LoadErrorReason.INVALID_DATA
+# This test has been broken by upstream ruamel.yaml, filed an issue here:
+#
+# https://sourceforge.net/p/ruamel-yaml/tickets/390/
+#
+@pytest.mark.xfail(reason="recent versions of ruamel.yaml have broken roundtripping perfection")
@pytest.mark.datafiles(os.path.join(DATA_DIR))
@pytest.mark.parametrize("fromdisk", [(True), (False)])
def test_roundtrip_dump(datafiles, fromdisk):
