Delete some code (#3563)

* Delete some code

* removed import

* delete more code

3 files changed, 8 insertions, 72 deletions

diff --git a/tests/conftest.py b/tests/conftest.py
index 8605f3ae..66a3cd64 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -8,7 +8,7 @@ import pytest
 
 from cryptography.hazmat.backends.openssl import backend as openssl_backend
 
-from .utils import check_backend_support, select_backends, skip_if_empty
+from .utils import check_backend_support, skip_if_empty
 
 
 def pytest_report_header(config):
@@ -17,19 +17,15 @@ def pytest_report_header(config):
 
 def pytest_generate_tests(metafunc):
     if "backend" in metafunc.fixturenames:
-        names = metafunc.config.getoption("--backend")
-        selected_backends = select_backends(names, [openssl_backend])
-
         filtered_backends = []
-        required = metafunc.function.requires_backend_interface
         required_interfaces = [
-            mark.kwargs["interface"] for mark in required
+            mark.kwargs["interface"]
+            for mark in metafunc.function.requires_backend_interface
         ]
-        for backend in selected_backends:
-            if all(
-                isinstance(backend, iface) for iface in required_interfaces
-            ):
-                filtered_backends.append(backend)
+        if all(
+            isinstance(openssl_backend, iface) for iface in required_interfaces
+        ):
+            filtered_backends.append(openssl_backend)
 
         # If you pass an empty list to parametrize Bad Things(tm) happen
         # as of pytest 2.6.4 when the test also has a parametrize decorator
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 0f695233..1637ba5b 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -24,8 +24,7 @@ from .utils import (
     load_hash_vectors, load_kasvs_dh_vectors,
     load_kasvs_ecdh_vectors, load_nist_kbkdf_vectors, load_nist_vectors,
     load_pkcs1_vectors, load_rsa_nist_vectors, load_vectors_from_file,
-    load_x963_vectors, raises_unsupported_algorithm, select_backends,
-    skip_if_empty
+    load_x963_vectors, raises_unsupported_algorithm, skip_if_empty
 )
 
 
@@ -33,48 +32,6 @@ class FakeInterface(object):
     pass
 
 
-def test_select_one_backend():
-    b1 = pretend.stub(name="b1")
-    b2 = pretend.stub(name="b2")
-    b3 = pretend.stub(name="b3")
-    backends = [b1, b2, b3]
-    name = "b2"
-    selected_backends = select_backends(name, backends)
-    assert len(selected_backends) == 1
-    assert selected_backends[0] == b2
-
-
-def test_select_no_backend():
-    b1 = pretend.stub(name="b1")
-    b2 = pretend.stub(name="b2")
-    b3 = pretend.stub(name="b3")
-    backends = [b1, b2, b3]
-    name = "back!"
-    with pytest.raises(ValueError):
-        select_backends(name, backends)
-
-
-def test_select_backends_none():
-    b1 = pretend.stub(name="b1")
-    b2 = pretend.stub(name="b2")
-    b3 = pretend.stub(name="b3")
-    backends = [b1, b2, b3]
-    name = None
-    selected_backends = select_backends(name, backends)
-    assert len(selected_backends) == 3
-
-
-def test_select_two_backends():
-    b1 = pretend.stub(name="b1")
-    b2 = pretend.stub(name="b2")
-    b3 = pretend.stub(name="b3")
-    backends = [b1, b2, b3]
-    name = "b2 ,b1 "
-    selected_backends = select_backends(name, backends)
-    assert len(selected_backends) == 2
-    assert selected_backends == [b1, b2]
-
-
 def test_skip_if_empty():
     with pytest.raises(pytest.skip.Exception):
         skip_if_empty([], [FakeInterface])
diff --git a/tests/utils.py b/tests/utils.py
index dc7377ae..44e16a57 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -25,23 +25,6 @@ KeyedHashVector = collections.namedtuple(
 )
 
 
-def select_backends(names, backend_list):
-    if names is None:
-        return backend_list
-    split_names = [x.strip() for x in names.split(',')]
-    selected_backends = []
-    for backend in backend_list:
-        if backend.name in split_names:
-            selected_backends.append(backend)
-
-    if len(selected_backends) > 0:
-        return selected_backends
-    else:
-        raise ValueError(
-            "No backend selected. Tried to select: {0}".format(split_names)
-        )
-
-
 def skip_if_empty(backend_list, required_interfaces):
     if not backend_list:
         pytest.skip(