test: add tests for set_values_monthly in Macro

Author: chilango74

tests/test_macro.py

@@ -68,6 +68,23 @@ def test_values_monthly(self):
         assert self.infl_usd.values_monthly[-1] == approx(-0.0059, abs=1e-4)
         assert self.infl_rub.values_monthly[-1] == approx(0.0276, abs=1e-4)
 
+    error_case_ids = ["invalid_date_format", "nonexistent_date", "invalid_value_type"]
+
+    @pytest.mark.parametrize("date, value",
+                             [("2022-06", 100.0), ("2025-01", 200.0), (pd.Timestamp.now().strftime('%Y-%m'), 150.0),
+                              ("2024-02", 300.0)])
+    def test_set_values_monthly_happy_path(self, date, value):  # Arrange instance = MyClass()
+        self.infl_rub.set_values_monthly(date, value)
+        assert self.infl_rub.values_monthly[pd.Period(date, freq='M')] == value
+
+    @pytest.mark.parametrize("date, value, expected_exception",
+                             [("12,2023", 100.0, ValueError), ("2023-13", 100.0, ValueError),
+                              ("2023-12", "one hundred", TypeError)],
+                             ids=error_case_ids)
+    def test_set_values_monthly_error_cases(self, date, value, expected_exception):
+        with pytest.raises(expected_exception):
+            self.infl_rub.set_values_monthly(date, value)
+
     def test_describe(self):
         description = self.infl_rub.describe(years=[5])
         assert list(description.columns) == [