Fixed #408 -- cleanup how is_available works

cryptography/hazmat/bindings/openssl/binding.py

@@ -13,9 +13,8 @@
 
 from __future__ import absolute_import, division, print_function
 
-from cryptography.hazmat.bindings.utils import (
-    build_ffi, binding_available
-)
+from cryptography.hazmat.bindings.utils import build_ffi
+
 
 _OSX_PRE_INCLUDE = """
 #ifdef __APPLE__
@@ -84,4 +83,4 @@ class Binding(object):
 
     @classmethod
     def is_available(cls):
-        return binding_available(cls._ensure_ffi_initialized)
+        return True

cryptography/hazmat/bindings/utils.py

@@ -87,11 +87,3 @@ def build_ffi(module_prefix, modules, pre_include, post_include, libraries):
                     delattr(lib, name)
 
     return ffi, lib
-
-
-def binding_available(initializer):
-    try:
-        initializer()
-        return True
-    except cffi.VerificationError:
-        return False

tests/hazmat/bindings/test_bindings.py

@@ -1,32 +0,0 @@
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-# implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from __future__ import absolute_import, division, print_function
-
-import cffi
-
-from cryptography.hazmat.bindings.utils import binding_available
-from cryptography.hazmat.bindings.openssl.binding import Binding
-
-
-def dummy_initializer():
-    ffi = cffi.FFI()
-    ffi.verify(source="#include <fake_header.h>")
-
-
-def test_binding_available():
-    assert binding_available(Binding._ensure_ffi_initialized) is True
-
-
-def test_binding_unavailable():
-    assert binding_available(dummy_initializer) is False