Add test for summary response reading past 2263

tests/ert/unit_tests/scenarios/test_summary_response.py

@@ -236,3 +236,36 @@ def test_that_mismatched_responses_gives_nan_measured_data(ert_config, prior_ens
     assert pd.isna(fopr_2.loc[0].iloc[0])
     assert pd.isna(fopr_2.loc[1].iloc[0])
     assert pd.isna(fopr_1.loc[2].iloc[0])
+
+
+def test_reading_past_2263_is_ok(ert_config, storage, prior_ensemble):
+    sample_prior(prior_ensemble, range(prior_ensemble.ensemble_size))
+
+    create_responses(
+        ert_config.user_config_file,
+        prior_ensemble,
+        ert_config.model_config.num_realizations * [[datetime(2500, 9, 9)]],
+    )
+
+    responses = prior_ensemble.load_responses("summary", (0, 1, 2))
+    assert np.isclose(
+        [-1.6038368, 0.06409992, 0.7408913], responses["values"].to_numpy()
+    ).all()
+
+    assert responses[["realization", "response_key", "time"]].to_dicts() == [
+        {
+            "realization": 0,
+            "response_key": "FOPR",
+            "time": datetime(2500, 9, 10, 0, 0),
+        },
+        {
+            "realization": 1,
+            "response_key": "FOPR",
+            "time": datetime(2500, 9, 10, 0, 0),
+        },
+        {
+            "realization": 2,
+            "response_key": "FOPR",
+            "time": datetime(2500, 9, 10, 0, 0),
+        },
+    ]