test: _is_expected_filetype raises on multiple extensions and passes

tests/utils/test_defence.py

@@ -359,3 +359,47 @@ def test_is_expected_filetype_raises_single(self):
                 check_existing=True,
                 exp_ext=".tiff",
             )
+
+    def test_is_expected_filetype_raises_multiple(self):
+        """Test raises when `exp_ext` is a list of multiple file extensions."""
+        with pytest.raises(
+            ValueError,
+            match=re.escape(
+                "`raster` expected file extension ['.gif', '.jiff']. Found .ti"
+            ),
+        ):
+            _is_expected_filetype(
+                "some_raster.tiff",
+                "raster",
+                check_existing=False,
+                exp_ext=[".gif", ".jiff"],
+            )
+        with pytest.raises(
+            ValueError,
+            match=re.escape(
+                "`osm.pbf` expected file extension ['.zip', '.gif', '.pdf']. F"
+            ),
+        ):
+            _is_expected_filetype(
+                "tests/data/newport-2023-06-13.osm.pbf",
+                "osm.pbf",
+                check_existing=True,
+                exp_ext=[".zip", ".gif", ".pdf"],
+            )
+
+    def test_is_expected_filetype_on_pass(self):
+        """Test when `exp_ext` passes."""
+        result = _is_expected_filetype(
+            "some_raster.tiff",
+            "raster",
+            check_existing=False,
+            exp_ext=[".gif", ".tiff"],
+        )
+        assert result is None
+        result = _is_expected_filetype(
+            "tests/data/newport-2023-06-13.osm.pbf",
+            "osm.pbf",
+            check_existing=True,
+            exp_ext=[".zip", ".gif", ".pbf"],
+        )
+        assert result is None