add test file

Author: molpopgen

python/test_json_metadata.py

@@ -0,0 +1,11 @@
+import tskit
+
+
+def setup_ts():
+    ts = tskit.TreeSequence.load("with_json_metadata.trees")
+    return ts
+
+
+def test_mutation_metadata():
+    ts = setup_ts()
+    raise NotImplementedError()