Add mandatory headers to files touched by this branch
diff --git a/tests/primitives/test_block.py b/tests/primitives/test_block.py
index 0407b0f..774409c 100644
--- a/tests/primitives/test_block.py
+++ b/tests/primitives/test_block.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 binascii
import pretend
diff --git a/tests/primitives/test_ciphers.py b/tests/primitives/test_ciphers.py
index 891c5cf..5ee9f22 100644
--- a/tests/primitives/test_ciphers.py
+++ b/tests/primitives/test_ciphers.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 binascii
import pytest
diff --git a/tests/primitives/test_nist.py b/tests/primitives/test_nist.py
index dc26543..db5e034 100644
--- a/tests/primitives/test_nist.py
+++ b/tests/primitives/test_nist.py
@@ -14,6 +14,9 @@
"""
Test using the NIST Test Vectors
"""
+
+from __future__ import absolute_import, division, print_function
+
import binascii
import os