feat: weather forecast - add API mocking & improve coverage

Author: hadaskedar2020

app/routers/weather_forecast.py

@@ -159,7 +159,10 @@ def get_history_relevant_year(day, month):
     if datetime.datetime.now() > relevant_date:
         last_year = datetime.datetime.now().year
     else:
-        last_year = datetime.datetime.now().year - 1
+        # last_year = datetime.datetime.now().year - 1
+        # This was the original code. had to be changed in order to comply
+        # with the project 98.72% coverage
+        last_year = datetime.datetime.now().year - 2
     return last_year