fix tests (#324)

* fix tests

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* lint

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/tests/test_national.py

@@ -103,6 +103,7 @@ def test_read_latest_national_values_start_and_end_filters(db_session, api_clien
         assert len(national_forecast_values) == 9
 
 
+@freeze_time("2024-01-01")
 def test_get_national_forecast(db_session, api_client):
     """Check main solar/GB/national/forecast route works"""
 
@@ -212,8 +213,10 @@ def test_read_latest_national_values_properties(db_session, api_client):
     national_forecast_values = [NationalForecastValue(**f) for f in response.json()]
     assert national_forecast_values[0].plevels is not None
     # index 24 is the middle of the day
-    assert np.round(national_forecast_values[24].plevels["plevel_10"], 2) == np.round(
-        national_forecast_values[24].expected_power_generation_megawatts * 0.9, 2
+    assert np.abs(
+        np.round(national_forecast_values[24].plevels["plevel_10"], 2)
+        - np.round(national_forecast_values[24].expected_power_generation_megawatts * 0.9, 2)
+        < 0.02
     )