feat: add mTLS ADC support for HTTP (#457)

feat: add mTLS ADC support for HTTP
diff --git a/tests/conftest.py b/tests/conftest.py
index 7f9a968..cf8a0f9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -12,12 +12,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import sys
 
 import mock
 import pytest
 
 
+def pytest_configure():
+    """Load public certificate and private key."""
+    pytest.data_dir = os.path.join(os.path.dirname(__file__), "data")
+
+    with open(os.path.join(pytest.data_dir, "privatekey.pem"), "rb") as fh:
+        pytest.private_key_bytes = fh.read()
+
+    with open(os.path.join(pytest.data_dir, "public_cert.pem"), "rb") as fh:
+        pytest.public_cert_bytes = fh.read()
+
+
 @pytest.fixture
 def mock_non_existent_module(monkeypatch):
     """Mocks a non-existing module in sys.modules.