Allow to ignore time.monotonic

README.rst

@@ -12,7 +12,7 @@ FreezeGun is a library that allows your python tests to travel through time by m
 Usage
 -----
 
-Once the decorator or context manager have been invoked, all calls to datetime.datetime.now(), datetime.datetime.utcnow(), datetime.date.today(), time.time(), time.localtime(), time.gmtime(), and time.strftime() will return the time that has been frozen.
+Once the decorator or context manager have been invoked, all calls to datetime.datetime.now(), datetime.datetime.utcnow(), datetime.date.today(), time.time(), time.localtime(), time.gmtime(), time.strftime() and time.monotonic() will return the time that has been frozen.
 
 Decorator
 ~~~~~~~~~
@@ -173,6 +173,7 @@ Freezegun allows moving time to specific dates.
 
 Parameter for ``move_to`` can be any valid ``freeze_time`` date (string, date, datetime).
 
+Note that for ``tick``, manual tick and ``move_to`` there is by default moved frozen time.monotonic(). If you need to turn this off just add ``'time.monotonic'`` to ``ignore`` parameter.
 
 Default Arguments
 ~~~~~~~~~~~~~~~~~

freezegun/api.py

@@ -422,7 +422,7 @@ def start(self):
             ('real_strftime', real_strftime, 'FakeStrfTime', fake_strftime),
             ('real_time', real_time, 'FakeTime', fake_time),
         ]
-        if real_monotonic is not None:
+        if real_monotonic is not None and 'time.monotonic' not in self.ignore:
             fake_monotonic = FakeMonotonic(time_to_freeze, time.monotonic)
             time.monotonic = fake_monotonic
             to_patch.append(('real_monotonic', real_monotonic, 'FakeMonotonic', fake_monotonic))
@@ -449,6 +449,9 @@ def start(self):
                 for module_attribute in dir(module):
                     if module_attribute in real_names:
                         continue
+                    if '{}.{}'.format(mod_name, module_attribute) in self.ignore:
+                        continue
+
                     try:
                         attribute_value = getattr(module, module_attribute)
                     except (ImportError, AttributeError, TypeError):
@@ -499,6 +502,9 @@ def stop(self):
 
                         if module_attribute in self.fake_names:
                             continue
+                        if '{}.{}'.format(mod_name, module_attribute) in self.ignore:
+                            continue
+
                         try:
                             attribute_value = getattr(module, module_attribute)
                         except (ImportError, AttributeError, TypeError):
@@ -513,7 +519,7 @@ def stop(self):
         time.gmtime = time.gmtime.previous_gmtime_function
         time.localtime = time.localtime.previous_localtime_function
         time.strftime = time.strftime.previous_strftime_function
-        if real_monotonic is not None:
+        if real_monotonic is not None and 'time.monotonic' not in self.ignore:
             time.monotonic = time.monotonic.previous_monotonic_function
 
         uuid._uuid_generate_time = real_uuid_generate_time

tests/test_datetimes.py

@@ -206,6 +206,27 @@ def test_move_to_monotonic():
         assert time.monotonic() == initial_monotonic
 
 
+def test_monotonic_can_be_ignored():
+    if sys.version_info[0] != 3:
+        raise skip.SkipTest("test target is Python3")
+
+    initial_datetime = datetime.datetime(year=1, month=7, day=12,
+                                         hour=15, minute=6, second=3)
+
+    other_datetime = datetime.datetime(year=2, month=8, day=13,
+                                       hour=14, minute=5, second=0)
+    # time.monotonic() will not affected by freeze_time
+    with freeze_time(initial_datetime, ignore=['time.monotonic']) as frozen_datetime:
+        initial_monotonic = time.monotonic()
+
+        frozen_datetime.move_to(other_datetime)
+        second_monotonic = time.monotonic()
+        assert second_monotonic > initial_monotonic
+
+        frozen_datetime.move_to(initial_datetime)
+        assert time.monotonic() > second_monotonic
+
+
 def test_bad_time_argument():
     try:
         freeze_time("2012-13-14", tz_offset=-4)