a couple of tests

tests/tests_integration/test_get_rates.py

@@ -0,0 +1,79 @@
+import datetime
+import random
+
+from click.testing import CliRunner
+from money.currency import Currency
+
+from xexe.cli import get_rates
+
+
+def test_get_rates_for_hardcoded_case_returns_expected_output():
+    """
+    Calling the CLI get-rates command to get the rates between USD, EUR and GBP
+    for 2024-01-01 to 2024-01-03 returns the expected records in a CSV.
+    """
+    runner = CliRunner()
+
+    with runner.isolated_filesystem():
+        run_result = runner.invoke(
+            get_rates,
+            [
+                "--start-date",
+                "2024-01-01",
+                "--end-date",
+                "2024-01-03",
+                "--currencies",
+                "USD,GBP,EUR",
+                "--output",
+                "test_output.csv",
+            ],
+        )
+
+        assert run_result.exit_code == 0
+
+        # Write code here to read output file and compare it against expected
+        # output
+        assert False
+
+
+def test_get_rates_dry_run_always_returns_42_as_rates():
+    """
+    Calling the CLI get-rates command with the dry-run flag will apparently
+    work, but it always returns 42 as the rate no matter what it's being asked
+    for since it doesn't call xe.com at all and 42 is the Answer to the Ultimate
+    Question of Life, the Universe, and Everything.
+    """
+
+    some_random_date = datetime.datetime(
+        year=random.choice(range(2010, 2020)),
+        month=random.choice(range(1, 13)),
+        day=random.choice(range(1, 29)),
+    ).date()
+
+    some_random_currencies = random.choices(population=list(Currency), k=3)
+
+    runner = CliRunner()
+
+    with runner.isolated_filesystem():
+        run_result = runner.invoke(
+            get_rates,
+            [
+                "--start-date",
+                some_random_date.strftime("%Y-%m-%d"),
+                "--end-date",
+                (some_random_date + datetime.timedelta(days=3)).strftime("%Y-%m-%d"),
+                "--currencies",
+                ",".join(
+                    [str(some_currency) for some_currency in some_random_currencies]
+                ),
+                "--output",
+                "test_output.csv",
+                "--dry-run",
+            ],
+        )
+
+        assert run_result.exit_code == 0
+
+        # Write code here to read output file and compare it against expected
+        # output
+        assert False