Added future imports and licenses that are missing
diff --git a/tests/__init__.py b/tests/__init__.py
index e69de29..2f42057 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -0,0 +1,14 @@
+# 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
diff --git a/tests/conftest.py b/tests/conftest.py
index 64982ef..0069f2c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,18 @@
+# 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 pytest
from cryptography.hazmat.backends import _ALL_BACKENDS
diff --git a/tests/hazmat/__init__.py b/tests/hazmat/__init__.py
index e69de29..2f42057 100644
--- a/tests/hazmat/__init__.py
+++ b/tests/hazmat/__init__.py
@@ -0,0 +1,14 @@
+# 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
diff --git a/tests/hazmat/backends/__init__.py b/tests/hazmat/backends/__init__.py
index e69de29..2f42057 100644
--- a/tests/hazmat/backends/__init__.py
+++ b/tests/hazmat/backends/__init__.py
@@ -0,0 +1,14 @@
+# 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
diff --git a/tests/hazmat/backends/test_commoncrypto.py b/tests/hazmat/backends/test_commoncrypto.py
index 7feb0c7..1062b2b 100644
--- a/tests/hazmat/backends/test_commoncrypto.py
+++ b/tests/hazmat/backends/test_commoncrypto.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import pytest
from cryptography import utils
diff --git a/tests/hazmat/backends/test_multibackend.py b/tests/hazmat/backends/test_multibackend.py
index 87ef044..31fb0a2 100644
--- a/tests/hazmat/backends/test_multibackend.py
+++ b/tests/hazmat/backends/test_multibackend.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import pytest
from cryptography import utils
diff --git a/tests/hazmat/backends/test_openssl.py b/tests/hazmat/backends/test_openssl.py
index c679218..599d153 100644
--- a/tests/hazmat/backends/test_openssl.py
+++ b/tests/hazmat/backends/test_openssl.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import pytest
from cryptography import utils
diff --git a/tests/hazmat/bindings/test_commoncrypto.py b/tests/hazmat/bindings/test_commoncrypto.py
index db3d1b7..0332674 100644
--- a/tests/hazmat/bindings/test_commoncrypto.py
+++ b/tests/hazmat/bindings/test_commoncrypto.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import pytest
from cryptography.hazmat.bindings.commoncrypto.binding import Binding
diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index c476390..acab22b 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import pytest
from cryptography.hazmat.bindings.openssl.binding import Binding
diff --git a/tests/hazmat/primitives/__init__.py b/tests/hazmat/primitives/__init__.py
index e69de29..2f42057 100644
--- a/tests/hazmat/primitives/__init__.py
+++ b/tests/hazmat/primitives/__init__.py
@@ -0,0 +1,14 @@
+# 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
diff --git a/tests/hazmat/primitives/test_padding.py b/tests/hazmat/primitives/test_padding.py
index 6a2b624..932cef1 100644
--- a/tests/hazmat/primitives/test_padding.py
+++ b/tests/hazmat/primitives/test_padding.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import pytest
import six
diff --git a/tests/hazmat/primitives/twofactor/__init__.py b/tests/hazmat/primitives/twofactor/__init__.py
index e69de29..2f42057 100644
--- a/tests/hazmat/primitives/twofactor/__init__.py
+++ b/tests/hazmat/primitives/twofactor/__init__.py
@@ -0,0 +1,14 @@
+# 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
diff --git a/tests/hazmat/primitives/twofactor/test_hotp.py b/tests/hazmat/primitives/twofactor/test_hotp.py
index 0f8c4a5..bc907c9 100644
--- a/tests/hazmat/primitives/twofactor/test_hotp.py
+++ b/tests/hazmat/primitives/twofactor/test_hotp.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import os
import pytest
diff --git a/tests/hazmat/primitives/twofactor/test_totp.py b/tests/hazmat/primitives/twofactor/test_totp.py
index a4a108b..f3bddb8 100644
--- a/tests/hazmat/primitives/twofactor/test_totp.py
+++ b/tests/hazmat/primitives/twofactor/test_totp.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import pytest
from cryptography.exceptions import InvalidToken
diff --git a/tests/hazmat/primitives/utils.py b/tests/hazmat/primitives/utils.py
index 5a8dc3a..f0a0031 100644
--- a/tests/hazmat/primitives/utils.py
+++ b/tests/hazmat/primitives/utils.py
@@ -1,3 +1,18 @@
+# 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 binascii
import os
diff --git a/tests/test_fernet.py b/tests/test_fernet.py
index bd4d90a..36e8729 100644
--- a/tests/test_fernet.py
+++ b/tests/test_fernet.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import base64
import calendar
import json
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 622a665..352085a 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import os
import textwrap
diff --git a/tests/utils.py b/tests/utils.py
index 0d9567f..519edb4 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import collections
import os