the great api -> backend rename
diff --git a/tests/primitives/test_hashes.py b/tests/primitives/test_hashes.py
index 03de891..505f6c8 100644
--- a/tests/primitives/test_hashes.py
+++ b/tests/primitives/test_hashes.py
@@ -23,13 +23,13 @@
 
 
 class TestBaseHash(object):
-    def test_base_hash_reject_unicode(self, api):
-        m = hashes.SHA1(api=api)
+    def test_base_hash_reject_unicode(self, backend):
+        m = hashes.SHA1(backend=backend)
         with pytest.raises(TypeError):
             m.update(six.u("\u00FC"))
 
-    def test_base_hash_hexdigest_string_type(self, api):
-        m = hashes.SHA1(api=api, data=b"")
+    def test_base_hash_hexdigest_string_type(self, backend):
+        m = hashes.SHA1(backend=backend, data=b"")
         assert isinstance(m.hexdigest(), str)
 
 
@@ -38,7 +38,7 @@
         hashes.SHA1,
         digest_size=20,
         block_size=64,
-        only_if=lambda api: api.supports_hash(hashes.SHA1),
+        only_if=lambda backend: backend.supports_hash(hashes.SHA1),
         skip_message="Does not support SHA1",
     )
 
@@ -48,7 +48,7 @@
         hashes.SHA224,
         digest_size=28,
         block_size=64,
-        only_if=lambda api: api.supports_hash(hashes.SHA224),
+        only_if=lambda backend: backend.supports_hash(hashes.SHA224),
         skip_message="Does not support SHA224",
     )
 
@@ -58,7 +58,7 @@
         hashes.SHA256,
         digest_size=32,
         block_size=64,
-        only_if=lambda api: api.supports_hash(hashes.SHA256),
+        only_if=lambda backend: backend.supports_hash(hashes.SHA256),
         skip_message="Does not support SHA256",
     )
 
@@ -68,7 +68,7 @@
         hashes.SHA384,
         digest_size=48,
         block_size=128,
-        only_if=lambda api: api.supports_hash(hashes.SHA384),
+        only_if=lambda backend: backend.supports_hash(hashes.SHA384),
         skip_message="Does not support SHA384",
     )
 
@@ -78,7 +78,7 @@
         hashes.SHA512,
         digest_size=64,
         block_size=128,
-        only_if=lambda api: api.supports_hash(hashes.SHA512),
+        only_if=lambda backend: backend.supports_hash(hashes.SHA512),
         skip_message="Does not support SHA512",
     )
 
@@ -88,7 +88,7 @@
         hashes.RIPEMD160,
         digest_size=20,
         block_size=64,
-        only_if=lambda api: api.supports_hash(hashes.RIPEMD160),
+        only_if=lambda backend: backend.supports_hash(hashes.RIPEMD160),
         skip_message="Does not support RIPEMD160",
     )
 
@@ -98,7 +98,7 @@
         hashes.Whirlpool,
         digest_size=64,
         block_size=64,
-        only_if=lambda api: api.supports_hash(hashes.Whirlpool),
+        only_if=lambda backend: backend.supports_hash(hashes.Whirlpool),
         skip_message="Does not support Whirlpool",
     )
 
@@ -108,6 +108,6 @@
         hashes.MD5,
         digest_size=16,
         block_size=64,
-        only_if=lambda api: api.supports_hash(hashes.MD5),
+        only_if=lambda backend: backend.supports_hash(hashes.MD5),
         skip_message="Does not support MD5",
     )