diff --git a/test/search_api/conftest.py b/test/search_api/conftest.py
index 157f8b0e..e5bfb508 100644
--- a/test/search_api/conftest.py
+++ b/test/search_api/conftest.py
@@ -1,23 +1,12 @@
-from icat.client import Client
-from icat.query import Query
+import json
+from unittest.mock import mock_open, patch
+
 import pytest
 
-from datagateway_api.src.common.config import Config
+from datagateway_api.src.search_api.panosc_mappings import PaNOSCMappings
 from datagateway_api.src.search_api.query import SearchAPIQuery
 
 
-@pytest.fixture(scope="package")
-def icat_client():
-    client = Client(
-        Config.config.search_api.icat_url,
-        checkCert=Config.config.search_api.icat_check_cert,
-    )
-    client.login(
-        Config.config.test_mechanism, Config.config.test_user_credentials.dict(),
-    )
-    return client
-
-
 @pytest.fixture()
 def search_api_query_dataset():
     return SearchAPIQuery("Dataset")
@@ -31,3 +20,115 @@ def search_api_query_document():
 @pytest.fixture()
 def search_api_query_instrument():
     return SearchAPIQuery("Instrument")
+
+
+@pytest.fixture()
+def test_search_api_mappings_data():
+    return {
+        "Affiliation": {
+            "base_icat_entity": "Affiliation",
+            "id": "id",
+            "name": "name",
+            "address": "fullReference",
+            "city": "",
+            "country": "",
+            "members": {"Member": "user.user.investigationUsers"},
+        },
+        "Dataset": {
+            "base_icat_entity": "Dataset",
+            "pid": "doi",
+            "title": "name",
+            "isPublic": "createTime",
+            "creationDate": "createTime",
+            "size": "",
+            "documents": {"Document": "investigation"},
+            "techniques": {"Technique": "datasetTechniques.technique"},
+            "instrument": {"Instrument": "datasetInstruments.instrument"},
+            "files": {"File": "datafiles"},
+            "parameters": {"Parameter": "parameters"},
+            "samples": {"Sample": "sample"},
+        },
+        "Document": {
+            "base_icat_entity": "Investigation",
+            "pid": "doi",
+            "isPublic": "releaseDate",
+            "type": "type.name",
+            "title": "name",
+            "summary": "summary",
+            "doi": "doi",
+            "startDate": "startDate",
+            "endDate": "endDate",
+            "releaseDate": "releaseDate",
+            "license": "",
+            "keywords": "keywords.name",
+            "datasets": {"Dataset": "datasets"},
+            "members": {"Member": "investigationUsers"},
+            "parameters": {"Parameter": "parameters"},
+        },
+        "File": {
+            "base_icat_entity": "Datafile",
+            "id": "id",
+            "name": "name",
+            "path": "location",
+            "size": "fileSize",
+            "dataset": {"Dataset": "dataset"},
+        },
+        "Instrument": {
+            "base_icat_entity": "Instrument",
+            "pid": "id",
+            "name": "name",
+            "facility": "facility.name",
+            "datasets": {"Dataset": "datasetInstruments.dataset"},
+        },
+        "Member": {
+            "base_icat_entity": "InvestigationUser",
+            "id": "id",
+            "role": "role",
+            "document": {"Document": "investigation"},
+            "person": {"Person": "user"},
+            "affiliation": {"Affiliation": "user.dataPublicationUsers.affiliations"},
+        },
+        "Parameter": {
+            "base_icat_entity": "InvestigationParameter",
+            "id": "id",
+            "name": "name",
+            "value": ["numericValue", "stringValue", "dateTimeValue"],
+            "unit": "type.units",
+            "dataset": {
+                "Dataset": "investigation.investigationInstruments.instrument."
+                "datasetInstruments.dataset",
+            },
+            "document": {"Document": "investigation"},
+        },
+        "Person": {
+            "base_icat_entity": "User",
+            "id": "id",
+            "fullName": "fullName",
+            "orcid": "orcidId",
+            "researcherId": "",
+            "firstName": "givenName",
+            "lastName": "familyName",
+            "members": {"Member": "investigationUsers"},
+        },
+        "Sample": {
+            "base_icat_entity": "Sample",
+            "name": "name",
+            "pid": "pid",
+            "description": "parameters.type.description",
+            "datasets": {"Dataset": "datasets"},
+        },
+        "Technique": {
+            "base_icat_entity": "Technique",
+            "pid": "pid",
+            "name": "name",
+            "datasets": {"Dataset": "datasetTechniques.dataset"},
+        },
+    }
+
+
+@pytest.fixture()
+def test_panosc_mappings(test_search_api_mappings_data):
+    with patch(
+        "builtins.open", mock_open(read_data=json.dumps(test_search_api_mappings_data)),
+    ):
+        return PaNOSCMappings("test/path")
diff --git a/test/search_api/test_panosc_mappings.py b/test/search_api/test_panosc_mappings.py
new file mode 100644
index 00000000..4d14054e
--- /dev/null
+++ b/test/search_api/test_panosc_mappings.py
@@ -0,0 +1,38 @@
+import pytest
+
+from datagateway_api.src.common.exceptions import SearchAPIError
+from datagateway_api.src.search_api.panosc_mappings import PaNOSCMappings
+
+
+class TestPaNOSCMappings:
+    def test_valid_load_mappings(self, test_panosc_mappings):
+        test_mappings = PaNOSCMappings()
+        assert test_mappings.mappings == test_panosc_mappings.mappings
+
+    @pytest.mark.parametrize(
+        "test_panosc_entity_name, test_panosc_related_field_name, expected_entity_name",
+        [
+            pytest.param("Dataset", "files", "File", id="Dataset.files"),
+            pytest.param(
+                "Document", "parameters", "Parameter", id="Document.parameters",
+            ),
+            pytest.param("Person", "members", "Member", id="Person.members"),
+        ],
+    )
+    def test_valid_get_panosc_related_entity_name(
+        self,
+        test_panosc_mappings,
+        test_panosc_entity_name,
+        test_panosc_related_field_name,
+        expected_entity_name,
+    ):
+        test_related_name = test_panosc_mappings.get_panosc_related_entity_name(
+            test_panosc_entity_name, test_panosc_related_field_name,
+        )
+        assert test_related_name == expected_entity_name
+
+    def test_invalid_get_panosc_related_entity_name(self, test_panosc_mappings):
+        with pytest.raises(SearchAPIError):
+            test_panosc_mappings.get_panosc_related_entity_name(
+                "UnknownField", "unknownField",
+            )