failure in js

test/mips_test_memory.js

@@ -39,4 +39,17 @@ describe("MIPSMemory contract", function () {
     expect(await mm.ReadMemory(root, 4)).to.equal(2)
     expect(await mm.ReadMemory(root, 0x40)).to.equal(3)
   })
+  it("write four should work", async function() {
+    await mm.AddTrieNode(new Uint8Array([0x80]))
+    let root = "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421"
+
+    root = await write(mm, root, 0xc0000080, 0xaa)
+    root = await write(mm, root, 0x7fffd00c, 1)
+    root = await write(mm, root, 0x7fffd010, 2)
+    root = await write(mm, root, 0x7fffcffc, 3)
+
+    expect(await mm.ReadMemory(root, 0x7fffd00c)).to.equal(1)
+    expect(await mm.ReadMemory(root, 0x7fffd010)).to.equal(2)
+    expect(await mm.ReadMemory(root, 0x7fffcffc)).to.equal(3)
+  })
 })