Add failing test

Author: znicholls

tests/integration/test_io.py

@@ -0,0 +1,14 @@
+import os.path
+
+import scmdata
+import scmdata.testing
+
+
+def test_read_write_circularity(test_scm_df_monthly, tmpdir):
+    tempfile = os.path.join(tmpdir, "test.csv")
+
+    test_scm_df_monthly.to_csv(tempfile)
+
+    read = scmdata.ScmRun(tempfile)
+
+    scmdata.testing.assert_scmdf_almost_equal(read, test_scm_df_monthly)