#150: Add tests for ICAT skip filters

test/icat/filters/test_skip_filter.py

@@ -0,0 +1,29 @@
+import pytest
+
+from datagateway_api.common.config import config
+from datagateway_api.common.exceptions import FilterError
+from datagateway_api.common.icat.filters import PythonICATSkipFilter
+
+
+class TestICATSkipFilter:
+    @pytest.mark.parametrize(
+        "skip_value", [pytest.param(10, id="typical"), pytest.param(0, id="boundary")],
+    )
+    def test_valid_skip_value(self, icat_query, skip_value):
+        test_filter = PythonICATSkipFilter(skip_value)
+        test_filter.apply_filter(icat_query)
+
+        assert icat_query.limit == (
+            skip_value,
+            config.get_icat_properties()["maxEntities"],
+        )
+
+    @pytest.mark.parametrize(
+        "skip_value",
+        [pytest.param(-375, id="extreme invalid"), pytest.param(-1, id="boundary")],
+    )
+    def test_invalid_skip_value(self, icat_query, skip_value):
+        test_filter = PythonICATSkipFilter(skip_value)
+
+        with pytest.raises(FilterError):
+            test_filter.apply_filter(icat_query)