test is wrong

contracts/MIPSMemory.sol

@@ -35,8 +35,15 @@ contract MIPSMemory {
     largePreimage[msg.sender] = c.A;
   }
 
-  function AddLargePreimageFinal(uint64[17] calldata data) public {
+  function AddLargePreimageFinal() public view returns (bytes32) {
+    Lib_Keccak256.CTX memory c;
+    c.A = largePreimage[msg.sender];
     // TODO: do this properly and save the hash
+    // when this is updated, it won't be "view"
+    return bytes32((uint256(c.A[0]) << 192) |
+                   (uint256(c.A[1]) << 128) |
+                   (uint256(c.A[2]) << 64) |
+                   c.A[3]);
   }
 
   function AddMerkleState(bytes32 stateHash, uint32 addr, uint32 value, string calldata proof) public {

test/libkeccak.js

+const { keccak256 } = require("@ethersproject/keccak256");
 const { expect } = require("chai");
 
 describe("MIPSMemory contract", function () {
@@ -11,11 +12,15 @@ describe("MIPSMemory contract", function () {
     await mm.AddLargePreimageInit();
     console.log("preimage initted");
 
-    var a = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
+    const a = ["0x0100000000000000",0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0x80];
     await mm.AddLargePreimageUpdate(a);
     console.log("preimage updated");
 
-    var tst = await mm.largePreimage(owner.address, 0);
-    console.log(tst);
+    /*var tst1 = await mm.largePreimage(owner.address, 0);
+    console.log(tst);*/
+
+    const hash = await mm.AddLargePreimageFinal();
+    console.log("comp hash is", hash);
+    console.log("real hash is", keccak256(new Uint8Array(0)));
   });
 });
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