Add tests for named tuple decoder

Author: banteg

tests/core/utilities/test_abi_named_tree.py

@@ -0,0 +1,23 @@
+from web3._utils.abi import named_data_tree
+from web3._utils.abi import check_if_arguments_can_be_encoded
+
+from .test_abi import TEST_FUNCTION_ABI
+
+
+def test_named_data_tree():
+    abi = TEST_FUNCTION_ABI['inputs']
+    inputs = (
+        (1, [2, 3, 4], [(5, 6), (7, 8), (9, 10)]),  # Value for s
+        (11, 12),                                   # Value for t
+        13,                                         # Value for a
+    )
+    expected = [
+        {'s': {'a': 1, 'b': [2, 3, 4], 'c': [{'x': 5, 'y': 6}, {'x': 7, 'y': 8}, {'x': 9, 'y': 10}]}},
+        {'t': {'x': 11, 'y': 12}},
+        {'a': 13},
+    ]
+    result = [named_data_tree(a, b) for a, b in zip(abi, inputs)]
+    assert result == expected
+
+    merged = {key: item[key] for item in result for key in item}
+    assert check_if_arguments_can_be_encoded(TEST_FUNCTION_ABI, (), merged)