Add panosc mapping to unit tests

test/conftest.py

@@ -1,6 +1,11 @@
+import json
+from unittest.mock import mock_open, patch
+
 from icat.query import Query
 import pytest
 
+from datagateway_api.src.common.config import APIConfig
+
 
 @pytest.fixture()
 def icat_query(icat_client):
@@ -48,3 +53,16 @@ def test_config_data():
         "test_user_credentials": {"username": "root", "password": "pw"},
         "test_mechanism": "simple",
     }
+
+
+@pytest.fixture()
+def test_config(test_config_data):
+    with patch("builtins.open", mock_open(read_data=json.dumps(test_config_data))):
+        return APIConfig.load("test/path")
+
+
+@pytest.fixture()
+def test_config_without_search_api(test_config_data):
+    del test_config_data["search_api"]
+    with patch("builtins.open", mock_open(read_data=json.dumps(test_config_data))):
+        return APIConfig.load("test/path")

test/unit/search_api/test_panosc_mappings.py

@@ -1,3 +1,5 @@
+from unittest.mock import patch
+
 import pytest
 
 from datagateway_api.src.common.exceptions import FilterError, SearchAPIError
@@ -9,6 +11,31 @@ def test_valid_load_mappings(self, test_panosc_mappings):
         test_mappings = PaNOSCMappings()
         assert test_mappings.mappings == test_panosc_mappings.mappings
 
+    @pytest.mark.parametrize(
+        "search_api_config_flag",
+        [
+            pytest.param(True, id="Search API config present"),
+            pytest.param(False, id="No search API config"),
+        ],
+    )
+    def test_invalid_load_mappings(
+        self, test_config, test_config_without_search_api, search_api_config_flag,
+    ):
+        if search_api_config_flag:
+            current_test_config = test_config
+        else:
+            current_test_config = test_config_without_search_api
+
+        with patch(
+            "datagateway_api.src.common.config.Config.config", current_test_config,
+        ):
+            if search_api_config_flag:
+                with pytest.raises(SystemExit):
+                    PaNOSCMappings("bad/path")
+            else:
+                # Shouldn't SysExit if a user isn't using the search API
+                PaNOSCMappings("bad/path")
+
     @pytest.mark.parametrize(
         "panosc_entity_name, field_name, expected_panosc_entity_name"
         ", expected_icat_field_name",