diff --git a/tests/test_backend.py b/tests/test_backend.py
index e2d2eda0..f610603d 100644
--- a/tests/test_backend.py
+++ b/tests/test_backend.py
@@ -12,8 +12,10 @@ def test_import_julia_modules():
     Main = julia_helpers.init_julia()
 
     # Ensure installed modules can be imported
-    julia_helpers.import_package(Main, "EquivalentCircuits")
+    ec = julia_helpers.import_package("EquivalentCircuits", Main=Main)
+    # Test Main is not required
+    ec = julia_helpers.import_package("EquivalentCircuits")
 
     # Throw error for non-existent module
     with pytest.raises(Exception):
-        julia_helpers.import_package(Main, "NonExistentModule")
+        julia_helpers.import_package("NonExistentModule", Main)
diff --git a/tests/test_io.py b/tests/test_io.py
index 53134344..bd6359d2 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -15,8 +15,8 @@ def test_load_eis_data():
         ae.load_eis_data("nonexistentfile.csv")
 
     # Load a valid txt file of EIS data
-    fpath = ASSETS_DIR / 'testdata.txt'
-    df = ae.load_eis_data(fpath)
+    fpath = ASSETS_DIR / 'test_data.txt'
+    df = ae.io.load_eis_data(fpath)
     frequencies = np.array(df["freq/Hz"]).astype(float)
     reals = np.array(df["Re(Z)/Ohm"]).astype(float)
     imags = -np.array(df["-Im(Z)/Ohm"]).astype(float)