quite a bit of development around get rates input handling

tests/tests_unit/test_input_handling.py

@@ -0,0 +1,94 @@
+import datetime
+
+import pytest
+from currencies import Currency
+from currencies.exceptions import CurrencyDoesNotExist
+
+from xexe.inputs_handling import handle_get_rates_inputs
+from xexe.utils import DateRange
+
+
+def test_handle_input_rates_works_with_full_correct_inputs():
+    handled_inputs = handle_get_rates_inputs(
+        start_date=datetime.datetime.now(),
+        end_date=datetime.datetime.now() + datetime.timedelta(days=7),
+        currencies="USD,EUR,GBP",
+        dry_run=False,
+        output="test_output.csv",
+    )
+    expected_result = {
+        "date_range": DateRange(
+            start_date=datetime.datetime.now().date(),
+            end_date=(datetime.datetime.now() + datetime.timedelta(days=7)).date(),
+        ),
+        "currencies": {Currency("USD"), Currency("EUR"), Currency("GBP")},
+        "dry_run": False,
+        "output": pathlib.Path("test_output.csv"),
+    }
+    assert handled_inputs == expected_result
+
+
+def test_handle_input_rates_raises_with_bad_currency_code():
+
+    with pytest.raises(CurrencyDoesNotExist):
+        handle_get_rates_inputs(
+            start_date=datetime.datetime.now(),
+            end_date=datetime.datetime.now() + datetime.timedelta(days=7),
+            currencies="not_a_currency,USD,not_this_either",
+            dry_run=False,
+            output="test_output.csv",
+        )
+
+
+def test_handle_input_rates_raises_with_start_date_after_end_date():
+    with pytest.raises(ValueError):
+        handle_get_rates_inputs(
+            start_date=datetime.datetime.now(),
+            end_date=datetime.datetime.now() - datetime.timedelta(days=7),
+            currencies="GBP,USD",
+            dry_run=False,
+            output="test_output.csv",
+        )
+
+
+def test_handle_input_rates_raises_with_output_different_than_csv():
+    with pytest.raises(ValueError):
+        handle_get_rates_inputs(
+            start_date=datetime.datetime.now(),
+            end_date=datetime.datetime.now() + datetime.timedelta(days=7),
+            currencies="GBP,USD",
+            dry_run=False,
+            output="test_output.xlsx",
+        )
+
+
+def test_handle_input_rates_brings_future_end_date_to_today():
+    handled_inputs = handle_get_rates_inputs(
+        start_date=datetime.datetime.now() - datetime.timedelta(days=7),
+        end_date=datetime.datetime.now() + datetime.timedelta(days=7),
+        currencies="USD,EUR,GBP",
+        dry_run=False,
+        output="test_output.csv",
+    )
+
+    assert handled_inputs["date_range"].end_date == datetime.datetime.now().date()
+
+
+def test_handle_input_rates_start_and_end_date_equal_works_fine():
+    handled_inputs = handle_get_rates_inputs(
+        start_date=datetime.datetime.now(),
+        end_date=datetime.datetime.now(),
+        currencies="USD,EUR,GBP",
+        dry_run=False,
+        output="test_output.csv",
+    )
+    expected_result = {
+        "date_range": DateRange(
+            start_date=datetime.datetime.now().date(),
+            end_date=(datetime.datetime.now() + datetime.timedelta(days=7)).date(),
+        ),
+        "currencies": {Currency("USD"), Currency("EUR"), Currency("GBP")},
+        "dry_run": False,
+        "output": "test_output.csv",
+    }
+    assert handled_inputs == expected_result