Add integration tests for API to change addresses watched by geth

test/contract/contracts/SLVToken.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: AGPL-3.0
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract SLVToken is ERC20 {
+    uint256 private countA;
+    uint256 private countB;
+
+    constructor() ERC20("Silver", "SLV") {}
+
+    function incrementCountA() public {
+      countA = countA + 1;
+    }
+
+    function incrementCountB() public {
+      countB = countB + 1;
+    }
+
+    receive() external payable {}
+
+    function destroy() public {
+        selfdestruct(payable(msg.sender));
+    }
+}