Add test_parse_edge_node_mapping

Mainly as developer documentation, so its clear what the input and output should be

Author: VeckoTheGecko

tests/test_sgrid.py

@@ -1,11 +1,31 @@
-from hypothesis import given
+import pytest
+from hypothesis import example, given
 
 from parcels._core import sgrid
 from tests.strategies import sgrid as sgrid_strategies
 
 
+@example(
+    edge_node_padding=[
+        ("edge1", "node1", sgrid.Padding.NONE),
+        ("edge2", "node2", sgrid.Padding.LOW),
+    ]
+)
 @given(sgrid_strategies.edge_node_padding_list(min_size=1, max_size=3))
 def test_edge_node_mapping_metadata_roundtrip(edge_node_padding):
     serialized = sgrid.serialize_edge_node_mapping(edge_node_padding)
     parsed = sgrid.parse_edge_node_mapping(serialized)
     assert parsed == edge_node_padding
+
+
+@pytest.mark.parametrize(
+    "input_, expected",
+    [
+        (
+            "edge1: node1(padding: none)",
+            [("edge1", "node1", sgrid.Padding.NONE)],
+        ),
+    ],
+)
+def test_parse_edge_node_mapping(input_, expected):
+    assert sgrid.parse_edge_node_mapping(input_) == expected