test: add test cases for incorrect number of topics

tests/test_incorrect_topics.py

@@ -0,0 +1,71 @@
+import pytest
+from hexbytes import HexBytes
+
+from eth_event import EventError, get_topic_map, decode_log
+
+abi_no_indexes = {
+    "anonymous": False,
+    "inputs": [
+        {"indexed": False, "name": "sender", "type": "address"},
+        {"indexed": False, "name": "receiver", "type": "address"},
+        {"indexed": False, "name": "value", "type": "uint256"},
+    ],
+    "name": "Transfer",
+    "type": "event",
+}
+
+log_no_indexes = {
+    "logIndex": 0,
+    "transactionIndex": 0,
+    "transactionHash": HexBytes(
+        "0xe1997c46647f74afdffb1473930f90b0ebf6902a75dda0d0c3cbd6d1b57a91e1"
+    ),
+    "blockHash": HexBytes("0xf571bead3dcf424322ddd02fa7fc0496e06386bef4029de55e2255dee4945cdf"),
+    "blockNumber": 4,
+    "address": "0xE7eD6747FaC5360f88a2EFC03E00d25789F69291",
+    "data": "0x00000000000000000000000066ab6d9362d4f35596279692f0251db63516587100000000000000000000000066ab6d9362d4f35596279692f0251db6351658710000000000000000000000000000000000000000000000000000000000002710",
+    "topics": [HexBytes("0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef")],
+    "type": "mined",
+}
+
+
+abi_indexes = {
+    "anonymous": False,
+    "inputs": [
+        {"indexed": True, "name": "sender", "type": "address"},
+        {"indexed": True, "name": "receiver", "type": "address"},
+        {"indexed": False, "name": "value", "type": "uint256"},
+    ],
+    "name": "Transfer",
+    "type": "event",
+}
+
+log_indexes = {
+    "logIndex": 0,
+    "transactionIndex": 0,
+    "transactionHash": HexBytes(
+        "0xe6eba721271cedb7a492c513d5dfedab73cc54f1a5a337fb027d23f523cada49"
+    ),
+    "blockHash": HexBytes("0x764e1736dc9cba192b2ebf2911abcad9168d4db35850a678600637f5a6de27ed"),
+    "blockNumber": 4,
+    "address": "0xE7eD6747FaC5360f88a2EFC03E00d25789F69291",
+    "data": "0x0000000000000000000000000000000000000000000000000000000000002710",
+    "topics": [
+        HexBytes("0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"),
+        HexBytes("0x00000000000000000000000066ab6d9362d4f35596279692f0251db635165871"),
+        HexBytes("0x00000000000000000000000033a4622b82d4c04a53e170c638b944ce27cffce3"),
+    ],
+    "type": "mined",
+}
+
+
+def test_too_many_topics():
+    topic_map = get_topic_map([abi_indexes])
+    with pytest.raises(EventError, match="more topics than expected"):
+        decode_log(log_no_indexes, topic_map)
+
+
+def test_insufficient_topics():
+    topic_map = get_topic_map([abi_no_indexes])
+    with pytest.raises(EventError, match="does not contain enough topics"):
+        decode_log(log_indexes, topic_map)