Clarified responsibility of the Job class.

The Job itself has nothing to do with queueing and dequeueing, so the
DequeueError wasn't appropriate here, either.

rq/exceptions.py

@@ -1,5 +1,9 @@
 class NoQueueError(Exception):
     pass
 
+class UnpickleError(Exception):
+    pass
+
 class DequeueError(Exception):
     pass
+

rq/job.py

@@ -1,24 +1,25 @@
 from pickle import loads
-from .exceptions import DequeueError
+from .exceptions import UnpickleError
 
 
 class Job(object):
     """A Job is just a convenient datastructure to pass around job (meta) data.
     """
-    __slots__ = ['func', 'args', 'kwargs', 'rv_key', 'origin']
-
     @classmethod
     def unpickle(cls, pickle_data):
         """Constructs a Job instance form the given pickle'd job tuple data."""
         try:
-            job_tuple = loads(pickle_data)
-            return Job(job_tuple)
-        except (AttributeError, ValueError, IndexError):
-            raise DequeueError('Could not decode job tuple.')
-
-    def __init__(self, job_tuple, origin=None):
-        self.func, self.args, self.kwargs, self.rv_key = job_tuple
-        self.origin = origin
+            return loads(pickle_data)
+        except (AttributeError, IndexError, TypeError):
+            raise UnpickleError('Could not decode job tuple.')
+
+    def __init__(self, func, *args, **kwargs):
+        self.func = func
+        self.args = args
+        self.kwargs = kwargs
+        self.rv_key = None
+        self.origin = None
+        self.timestamp = None
 
     def perform(self):
         """Invokes the job function with the job arguments.
@@ -38,4 +39,3 @@ class Job(object):
     def __str__(self):
         return '<Job %s>' % self.call_string
 
-

tests/test_job.py

@@ -1,11 +1,43 @@
 from tests import RQTestCase
-#from pickle import loads, dumps
+from pickle import dumps, loads
+from rq.job import Job
 #from rq import Queue, Worker
-#from rq.exceptions import DequeueError
+from rq.exceptions import UnpickleError
+
+
+def arbitrary_function(x, y, z=1):
+    return x * y / z
 
 
 class TestJob(RQTestCase):
     def test_create_job(self):
         """Creation of jobs."""
-        pass
+        job = Job(arbitrary_function, 3, 4, z=2)
+        self.assertEquals(job.func, arbitrary_function)
+        self.assertEquals(job.args, (3, 4))
+        self.assertEquals(job.kwargs, {'z': 2})
+        self.assertIsNone(job.origin)
+        self.assertIsNone(job.timestamp)
+        self.assertIsNone(job.rv_key)
+
+    def test_pickle_job(self):
+        """Pickling of jobs."""
+        job = Job(arbitrary_function, 3, 4, z=2)
+        job2 = loads(dumps(job))
+        self.assertEquals(job.func, job2.func)
+        self.assertEquals(job.args, job2.args)
+        self.assertEquals(job.kwargs, job2.kwargs)
+
+    def test_unpickle_errors(self):
+        """Handling of unpickl'ing errors."""
+        with self.assertRaises(UnpickleError):
+            Job.unpickle('this is no pickle data')
+
+        with self.assertRaises(UnpickleError):
+            Job.unpickle(13)
+
+        pickle_data = dumps(Job(arbitrary_function, 2, 3))
+        corrupt_data = pickle_data.replace('arbitrary', 'b0rken')
+        with self.assertRaises(UnpickleError):
+            Job.unpickle(corrupt_data)