new(test): add tests for EOF/EIP-663 DUPN SWAPN

tests/prague/eip663_dupn_swapn_exchange/test_dupn.py

@@ -0,0 +1,36 @@
+import pytest
+
+from ethereum_test_tools import *
+
+REFERENCE_SPEC_GIT_PATH = "EIPS/eip-663.md"
+REFERENCE_SPEC_VERSION = "6aed382f86258f33603f5dc275956f739aaae096"
+CODE_ADDRESS = 0xc0de
+
+
+@pytest.mark.valid_from("Prague")
+def test_dupn_example1(
+        state_test: StateTestFiller,
+):
+    code_hex = "ef0001010004020001020904000000008001026001600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002600260026002e6ff60005560015500"
+    code = bytes.fromhex(code_hex)
+
+    pre = {
+        TestAddress: Account(balance=1_000_000_000),
+        CODE_ADDRESS: Account(code=code),
+    }
+
+    post = {
+        CODE_ADDRESS: Account(storage={0: 1, 1: 2})
+    }
+
+    tx = Transaction(
+        to=CODE_ADDRESS,
+        gas_limit=1_000_000
+    )
+
+    state_test(
+        env=Environment(),
+        pre=pre,
+        post=post,
+        tx=tx,
+    )