diff --git a/tests/one_ree_settings.txt b/tests/one_ree_settings.txt
new file mode 100644
index 0000000..f452627
--- /dev/null
+++ b/tests/one_ree_settings.txt
@@ -0,0 +1 @@
+{"exp_csv_filename": "../data/csvs/exp_data.csv", "phases_xml_filename": "../data/xmls/twophase.xml", "opt_dict": {"Nd(H(A)2)3(org)": {"h0": -4662344.6400}}, "phase_names": ["HCl_electrolyte", "PC88A_liquid"], "aq_solvent_name": "H2O(L)", "extractant_name": "(HA)2(org)", "diluant_name": "dodecane", "complex_name": "Nd(H(A)2)3(org)", "rare_earth_ion_name": "Nd+++", "aq_solvent_rho": 1000.0, "extractant_rho": 960.0, "diluant_rho": 750.0}
\ No newline at end of file