adding result objects, renaming components

tests/analysis/test_forecast.py

@@ -5,18 +5,18 @@ from delta_barth.analysis import forecast as fc
 
 def test_sales_per_customer_success(sales_data):
     customer_id = 1133
-    err, res = fc.sales_per_customer(sales_data, customer_id)
+    res = fc.sales_per_customer(sales_data, customer_id)
 
-    assert err == 0
-    assert res is not None
+    assert res.status.status_code == 0
+    assert res.data is not None
 
 
 def test_sales_per_customer_too_few_data_points(sales_data):
     customer_id = 1000
-    err, res = fc.sales_per_customer(sales_data, customer_id)
+    res = fc.sales_per_customer(sales_data, customer_id)
 
-    assert err == 1
-    assert res is None
+    assert res.status.status_code == 1
+    assert res.data is None
 
 
 def test_parse_api_resp_to_df(exmpl_api_sales_prognosis_resp):