Fix a number of issues with pr253 (#258)

* Temporarily Revert "Make AsyncRetrying callable (as Retrying class) (#253)"

This reverts commit 78a462e

* Add test coverage for __call__() interface: Tests passing

* Re-apply "Make AsyncRetrying callable (as Retrying class) (#253)": Tests fail

Tests in TestInvokeViaLegacyCallMethod begin to fail.

This reverts commit 8ee3d27

* Fix Retrying.call() to invoke __call__ correctly and return result

* Fix Retrying.call() to raise DeprecationWarning

* pep8

tenacity/__init__.py

@@ -431,8 +431,8 @@ def __call__(self, fn, *args, **kwargs):
     def call(self, *args, **kwargs):
         """Use ``__call__`` instead because this method is deprecated."""
         warnings.warn("'Retrying.call()' method is deprecated. " +
-                      "Use 'Retrying.__call__()' instead")
-        self.__call__(self, *args, **kwargs)
+                      "Use 'Retrying.__call__()' instead", DeprecationWarning)
+        return self.__call__(*args, **kwargs)
 
 
 class Future(futures.Future):

tenacity/tests/test_tenacity.py

@@ -1432,6 +1432,81 @@ def test():
         self.assertRaises(CustomError, test)
 
 
+class TestInvokeAsCallable:
+    """Test direct invocation of Retrying as a callable."""
+
+    @staticmethod
+    def invoke(retry, f):
+        """
+        Invoke Retrying logic.
+
+        Wrapper allows testing different call mechanisms in test sub-classes.
+        """
+        return retry(f)
+
+    def test_retry_one(self):
+        def f():
+            f.calls.append(len(f.calls) + 1)
+            if len(f.calls) <= 1:
+                raise Exception("Retry it!")
+            return 42
+        f.calls = []
+
+        retry = Retrying()
+        assert self.invoke(retry, f) == 42
+        assert f.calls == [1, 2]
+
+    def test_on_error(self):
+        class CustomError(Exception):
+            pass
+
+        def f():
+            f.calls.append(len(f.calls) + 1)
+            if len(f.calls) <= 1:
+                raise CustomError("Don't retry!")
+            return 42
+        f.calls = []
+
+        retry = Retrying(retry=tenacity.retry_if_exception_type(IOError))
+        with pytest.raises(CustomError):
+            self.invoke(retry, f)
+        assert f.calls == [1]
+
+    def test_retry_error(self):
+        def f():
+            f.calls.append(len(f.calls) + 1)
+            raise Exception("Retry it!")
+        f.calls = []
+
+        retry = Retrying(stop=tenacity.stop_after_attempt(2))
+        with pytest.raises(RetryError):
+            self.invoke(retry, f)
+        assert f.calls == [1, 2]
+
+    def test_reraise(self):
+        class CustomError(Exception):
+            pass
+
+        def f():
+            f.calls.append(len(f.calls) + 1)
+            raise CustomError("Retry it!")
+        f.calls = []
+
+        retry = Retrying(reraise=True, stop=tenacity.stop_after_attempt(2))
+        with pytest.raises(CustomError):
+            self.invoke(retry, f)
+        assert f.calls == [1, 2]
+
+
+class TestInvokeViaLegacyCallMethod(TestInvokeAsCallable):
+    """Retrying.call() method should work the same as Retrying.__call__()."""
+
+    @staticmethod
+    def invoke(retry, f):
+        with reports_deprecation_warning():
+            return retry.call(f)
+
+
 class TestRetryException(unittest.TestCase):
 
     def test_retry_error_is_pickleable(self):