remove atob, make test fail

contracts/MIPS.sol

@@ -43,7 +43,9 @@ contract MIPS {
   function WriteMemory(bytes32 stateHash, uint32 addr, uint32 value) internal returns (bytes32) {
     if (address(m) != address(0)) {
       emit DidWriteMemory(addr, value);
-      return m.WriteMemory(stateHash, addr, value);
+      bytes32 newStateHash = m.WriteMemory(stateHash, addr, value);
+      require(ReadMemory(newStateHash, addr) == value, "memory readback check failed");
+      return newStateHash;
     } else {
       assembly {
         // TODO: this is actually doing an SLOAD first

test/mips_test_trie.js

@@ -9,7 +9,7 @@ describe("MIPS contract", function () {
     const mm = await ethers.getContractAt("MIPSMemory", await m.m())
 
     for (k in trieAdd['preimages']) {
-      const bin = Uint8Array.from(atob(trieAdd['preimages'][k]), c => c.charCodeAt(0))
+      const bin = Uint8Array.from(Buffer.from(trieAdd['preimages'][k], 'base64').toString('binary'), c => c.charCodeAt(0))
       await mm.AddTrieNode(bin)
     }