Add test for crawling functions with _.result.

lodash.js

@@ -12287,6 +12287,7 @@
       var index = -1,
           length = path.length;
 
+      // Ensure the loop is entered when path is empty.
       if (!length) {
         object = undefined;
         length = 1;

test/test.js

@@ -18137,28 +18137,35 @@
   QUnit.module('lodash.result');
 
   (function() {
-    var object = {
-      'a': 1,
-      'b': function() { return this.a; }
-    };
+    var object = { 'a': 1, 'b': alwaysB };
 
     QUnit.test('should invoke function values', function(assert) {
       assert.expect(1);
 
-      assert.strictEqual(_.result(object, 'b'), 1);
+      assert.strictEqual(_.result(object, 'b'), 'b');
     });
 
     QUnit.test('should invoke default function values', function(assert) {
       assert.expect(1);
 
       var actual = _.result(object, 'c', object.b);
-      assert.strictEqual(actual, 1);
+      assert.strictEqual(actual, 'b');
+    });
+
+    QUnit.test('should invoke nested function values', function(assert) {
+      assert.expect(2);
+
+      var value = { 'a': lodashStable.constant({ 'b': alwaysB }) };
+
+      lodashStable.each(['a.b', ['a', 'b']], function(path) {
+        assert.strictEqual(_.result(value, path), 'b');
+      });
     });
 
     QUnit.test('should invoke deep property methods with the correct `this` binding', function(assert) {
       assert.expect(2);
 
-      var value = { 'a': object };
+      var value = { 'a': { 'b': function() { return this.c; }, 'c': 1 } };
 
       lodashStable.each(['a.b', ['a', 'b']], function(path) {
         assert.strictEqual(_.result(value, path), 1);