diff --git a/test/fixtures/transaction.json b/test/fixtures/transaction.json
index 214b115..20de9a1 100644
--- a/test/fixtures/transaction.json
+++ b/test/fixtures/transaction.json
@@ -231,6 +231,45 @@
       "coinbase": false
     }
   ],
+  "hashForSignature": [
+    {
+      "description": "Out of range inIndex",
+      "txHex": "010000000200000000000000000000000000000000000000000000000000000000000000000000000000ffffffff00000000000000000000000000000000000000000000000000000000000000000000000000ffffffff01e8030000000000000000000000",
+      "inIndex": 2,
+      "script": "OP_0",
+      "type": 0,
+      "hash": "0000000000000000000000000000000000000000000000000000000000000001"
+    },
+    {
+      "description": "inIndex > nOutputs (SIGHASH_SINGLE)",
+      "txHex": "010000000200000000000000000000000000000000000000000000000000000000000000000000000000ffffffff00000000000000000000000000000000000000000000000000000000000000000000000000ffffffff01e8030000000000000000000000",
+      "inIndex": 2,
+      "script": "OP_0",
+      "type": 3,
+      "hash": "0000000000000000000000000000000000000000000000000000000000000001"
+    },
+    {
+      "txHex": "010000000200000000000000000000000000000000000000000000000000000000000000000000000000ffffffff00000000000000000000000000000000000000000000000000000000000000000000000000ffffffff01e8030000000000000000000000",
+      "inIndex": 0,
+      "script": "OP_0 OP_3",
+      "type": 0,
+      "hash": "3d56a632462b9fc9b89eeddcad7dbe476297f34aff7e5f9320e2a99fb5e97136"
+    },
+    {
+      "txHex": "010000000200000000000000000000000000000000000000000000000000000000000000000000000000ffffffff00000000000000000000000000000000000000000000000000000000000000000000000000ffffffff01e8030000000000000000000000",
+      "inIndex": 0,
+      "script": "OP_0 OP_CODESEPARATOR OP_3",
+      "type": 0,
+      "hash": "3d56a632462b9fc9b89eeddcad7dbe476297f34aff7e5f9320e2a99fb5e97136"
+    },
+    {
+      "txHex": "010000000200000000000000000000000000000000000000000000000000000000000000000000000000ffffffff00000000000000000000000000000000000000000000000000000000000000000000000000ffffffff01e8030000000000000000000000",
+      "inIndex": 0,
+      "script": "OP_0 OP_CODESEPARATOR OP_4",
+      "type": 0,
+      "hash": "fa075877cb54916236806a6562e4a8cdad48adf1268e73d72d1f9fdd867df463"
+    }
+  ],
   "invalid": {
     "addInput": [
       {
diff --git a/test/transaction.js b/test/transaction.js
index 4aa7a27..d11ab29 100644
--- a/test/transaction.js
+++ b/test/transaction.js
@@ -172,6 +172,14 @@ describe('Transaction', function () {
     })
   })
 
-  // TODO:
-  //  hashForSignature: [Function],
+  describe('hashForSignature', function () {
+    fixtures.hashForSignature.forEach(function (f) {
+      it('should return ' + f.hash + ' for ' + (f.description ? ('case "' + f.description + '"') : f.script), function () {
+        var tx = Transaction.fromHex(f.txHex)
+        var script = bscript.fromASM(f.script)
+
+        assert.strictEqual(tx.hashForSignature(f.inIndex, script, f.type).toString('hex'), f.hash)
+      })
+    })
+  })
 })