diff --git a/generate/input/descriptor.json b/generate/input/descriptor.json
@@ -1158,7 +1158,10 @@
 	    "functions": {
 	      "git_signature_new": {
 	        "isAsync": false
-	      }
+	      },
+        "git_signature_now": {
+          "isAsync": false
+        }
 	    }
 	  },
     "smart": {

diff --git a/test/tests/signature.js b/test/tests/signature.js
@@ -0,0 +1,35 @@
+var assert = require("assert");
+
+describe("Signature", function() {
+
+  var Signature = require("../../lib/signature");
+  var name = "Bob Gnarley";
+  var email = "gnarlee@bob.net";
+  var arbitraryDate = 123456789;
+  var timezoneOffset = 60;
+
+  it("can be created at an arbitrary time", function() {
+    var create = Signature.create;
+    var signature = create(name, email, arbitraryDate, timezoneOffset);
+
+    assert.equal(signature.name(), name);
+    assert.equal(signature.email(), email);
+    assert.equal(signature.when().time(), arbitraryDate);
+    assert.equal(signature.when().offset(), 60);
+
+  });
+
+  it("can be created now", function() {
+
+    var signature = Signature.now(name, email);
+    var now = new Date();
+    var when = signature.when();
+    var diff = Math.abs(when.time() - now/1000);
+    assert.equal(signature.name(), name);
+    assert.equal(signature.email(), email);
+    assert(diff <= 1);
+
+    // libgit2 does its timezone offsets backwards from javascript
+    assert.equal(when.offset(), -now.getTimezoneOffset());
+  });
+});