From 288f6ac5465eeb95ba74e729ec7c580a8cdecd18 Mon Sep 17 00:00:00 2001
From: Alex Ehlke <alex.ehlke@gmail.com>
Date: Tue, 13 Oct 2015 14:43:19 -0400
Subject: [PATCH] Add manual increment via tick method

---
 AUTHORS.rst             |  1 +
 freezegun/api.py        |  8 ++++++--
 tests/test_datetimes.py | 15 +++++++++++++++
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/AUTHORS.rst b/AUTHORS.rst
index 312da0aa..bb1d92a4 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -12,3 +12,4 @@ Patches and Suggestions
 - `Jesse London <https://github.com/jesteria>`_
 - `Zach Smith <https://github.com/zmsmith>`_
 - `Adam Johnson <https://github.com/adamchainz>`_
+- `Alex Ehlke <https://github.com/aehlke>`_
diff --git a/freezegun/api.py b/freezegun/api.py
index 614c7c77..9ddeeed3 100644
--- a/freezegun/api.py
+++ b/freezegun/api.py
@@ -254,6 +254,9 @@ def __init__(self, time_to_freeze):
     def __call__(self):
         return self.time_to_freeze
 
+    def tick(self, delta=datetime.timedelta(seconds=1)):
+        self.time_to_freeze += delta
+
 
 class _freeze_time(object):
 
@@ -323,13 +326,12 @@ def tearDownClass(cls):
             return klass
 
     def __enter__(self):
-        self.start()
+        return self.start()
 
     def __exit__(self, *args):
         self.stop()
 
     def start(self):
-
         if self.tick:
             time_to_freeze = TickingDateTimeFactory(self.time_to_freeze, real_datetime.now())
         else:
@@ -409,6 +411,8 @@ def start(self):
         datetime.date.dates_to_freeze.append(time_to_freeze)
         datetime.date.tz_offsets.append(self.tz_offset)
 
+        return time_to_freeze
+
     def stop(self):
         datetime.datetime.times_to_freeze.pop()
         datetime.datetime.tz_offsets.pop()
diff --git a/tests/test_datetimes.py b/tests/test_datetimes.py
index 74130a26..3c67f4d3 100644
--- a/tests/test_datetimes.py
+++ b/tests/test_datetimes.py
@@ -122,6 +122,21 @@ def test_time_with_dst():
     freezer.stop()
 
 
+def test_manual_increment():
+    initial_datetime = datetime.datetime(year=1, month=7, day=12,
+                                        hour=15, minute=6, second=3)
+    with freeze_time(initial_datetime) as frozen_datetime:
+        assert frozen_datetime() == initial_datetime
+
+        frozen_datetime.tick()
+        initial_datetime += datetime.timedelta(seconds=1)
+        assert frozen_datetime() == initial_datetime
+
+        frozen_datetime.tick(delta=datetime.timedelta(seconds=10))
+        initial_datetime += datetime.timedelta(seconds=10)
+        assert frozen_datetime() == initial_datetime
+
+
 def test_bad_time_argument():
     try:
         freeze_time("2012-13-14", tz_offset=-4)