Add test for back heavy sandwiches

tests/test_heavy_sandwiches.py

@@ -0,0 +1,25 @@
+from typing import List
+
+from mev_inspect.classifiers.trace import TraceClassifier
+from mev_inspect.sandwiches import get_sandwiches
+from mev_inspect.schemas.sandwiches import Sandwich
+from mev_inspect.schemas.swaps import Swap
+from mev_inspect.swaps import get_swaps
+from tests.utils import load_test_block
+
+
+def test_back_heavy_sandwich_profits(trace_classifier: TraceClassifier):
+    block_number = 13699765
+    expected_sandwicher = "0x51399b32cd0186bb32230e24167489f3b2f47870"
+    expected_token_address = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
+    expected_profit_amount = -435805264121298944
+
+    block = load_test_block(block_number)
+    classified_traces = trace_classifier.classify(block.traces)
+    swaps: List[Swap] = get_swaps(classified_traces)
+    result: List[Sandwich] = get_sandwiches(swaps)
+
+    for observed_sandwich in result:
+        if observed_sandwich.sandwicher_address == expected_sandwicher:
+            assert expected_token_address == observed_sandwich.profit_token_address
+            assert expected_profit_amount == observed_sandwich.profit_amount