add unit test and modify template to include example with filtered series, closes #3

template.m

@@ -23,9 +23,14 @@ df_cart = fetch_series_by_api_link("https://api.db.nomics.world/v22/series?serie
 df_multi_freq = fetch_series('series_ids', ["BEA/NIUnderlyingDetail-U001BC/S315-A",...
                                             "BEA/NIUnderlyingDetail-U001BC/S315-Q",...
                                             "BEA/NIUnderlyingDetail-U001BC/S315-M"]);
-                                        
-%% TO BE IMPLEMENTED
-% fetch one series and apply interpolation filter %NOT IMPLEMENTED
+                    
+% fetch one series and apply interpolation filter
+filters_ = '[{"code": "interpolate", "parameters": {"frequency": "monthly", "method": "spline"}}]';
 df_filter = fetch_series('series_ids', "AMECO/ZUTN/EA19.1.0.0.0.ZUTN",...
-                         'dbnomics_filters', '[{"code": "interpolate", "parameters": {"frequency": "monthly", "method": "spline"}}]');
+                         'dbnomics_filters', filters_);
 
+% fetch multiple series and apply interpolation filter
+df_filters = fetch_series('series_ids', ["AMECO/ZUTN/EA19.1.0.0.0.ZUTN", "AMECO/ZUTN/DNK.1.0.0.0.ZUTN"],...
+                         'dbnomics_filters', filters_);
+                     
+                     
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tests/run_all_tests_matlab.m

@@ -11,6 +11,7 @@ r = [r; run_this_test('test_fetch_series_of_dataset')];
 r = [r; run_this_test('test_fetch_series_by_api_link')];
 r = [r; run_this_test('test_fetch_series_with_na_values')];
 r = [r; run_this_test('test_fetch_series_with_max_nb_series')];
+r = [r; run_this_test('test_fetch_series_with_filter_on_one_series')];
 print_results(r);
 
 

tests/test_fetch_series_with_filter_on_one_series.m

+function test_fetch_series_with_filter_on_one_series()
+filters_ = '[{"code": "interpolate", "parameters": {"frequency": "monthly", "method": "spline"}}]';
+df = fetch_series('provider_code', "AMECO", 'dataset_code', "ZUTN", 'series_code', "DEU.1.0.0.0.ZUTN", 'dbnomics_filters', filters_);
+
+idx = find(strcmp('provider_code',df(1,:)));
+provider_codes = unique(df(2:end,idx));
+assert(length(provider_codes)==1);
+assert(provider_codes{1} == "AMECO");
+
+idx = find(strcmp('dataset_code',df(1,:)));
+dataset_codes = unique(df(2:end,idx));
+assert(length(dataset_codes) == 1);
+assert(dataset_codes{1} == "ZUTN");
+
+idx = find(strcmp('series_code',df(1,:)));
+series_codes = unique(df(2:end,idx));
+assert(series_codes{1} == "DEU.1.0.0.0.ZUTN");
+
+assert(any(find(strcmp('filtered',df(1,:)))));
+idx_freq = find(strcmp('x_frequency',df(1,:)));
+frequencies = unique(df(2:end, idx_freq));
+assert(any(strcmp(frequencies, "monthly")));
+assert(any(contains(series_codes, "_filtered")));
+end
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