diff --git a/tests/snapshots/test_es_gateway.ambr b/tests/snapshots/test_es_gateway.ambr
new file mode 100644
index 0000000..8915fd2
--- /dev/null
+++ b/tests/snapshots/test_es_gateway.ambr
@@ -0,0 +1,25 @@
+# serializer version: 1
+# name: Test_Init.Test_ElasticsearchStateful.test_es8_async_init_with_tls_custom_ca
+  dict({
+    'issuer': tuple(
+      tuple(
+        tuple(
+          'commonName',
+          'Elasticsearch security auto-configuration HTTP CA',
+        ),
+      ),
+    ),
+    'notAfter': 'Dec 18 17:55:54 2027 GMT',
+    'notBefore': 'Dec 18 17:55:54 2024 GMT',
+    'serialNumber': '25813FA4F725F5566FCF014C0B8B0973E710DF90',
+    'subject': tuple(
+      tuple(
+        tuple(
+          'commonName',
+          'Elasticsearch security auto-configuration HTTP CA',
+        ),
+      ),
+    ),
+    'version': 3,
+  })
+# ---
diff --git a/tests/test_es_gateway.py b/tests/test_es_gateway.py
index bc32f2a..2f7c806 100644
--- a/tests/test_es_gateway.py
+++ b/tests/test_es_gateway.py
@@ -1,6 +1,7 @@
 """Tests for the Elasticsearch Gateway."""
 # noqa: F401 # pylint: disable=redefined-outer-name
 
+import os
 import ssl
 from typing import Any
 from unittest.mock import AsyncMock, MagicMock
@@ -198,11 +199,51 @@ async def test_es8_async_init_with_tls(self, es_mock_builder) -> None:
 
             assert gateway._client is not None
             node: BaseNode = gateway._client._transport.node_pool.get()
-            assert node is not None
-            assert hasattr(node, "_ssl_context")
-            if hasattr(node, "_ssl_context"):
-                assert node._ssl_context.check_hostname is True
-                assert node._ssl_context.verify_mode == ssl.CERT_REQUIRED
+            ssl_context = node._ssl_context  # type: ignore[reportAttributeAccessIssue]
+
+            assert ssl_context.check_hostname is True
+            assert ssl_context.verify_mode == ssl.CERT_REQUIRED
+
+            await gateway.stop()
+
+        async def test_es8_async_init_with_tls_custom_ca(self, es_mock_builder, snapshot) -> None:
+            """Test initializing a gateway with TLS and custom ca."""
+
+            # cert is located in "certs/http_ca.crt" relative to this file, get the absolute path
+
+            current_directory = os.path.dirname(os.path.abspath(__file__))
+
+            gateway = Elasticsearch8Gateway(
+                gateway_settings=Gateway8Settings(
+                    url=const.TEST_CONFIG_ENTRY_DATA_URL,
+                    verify_certs=True,
+                    verify_hostname=True,
+                    ca_certs=f"{current_directory}/certs/http_ca.crt",
+                )
+            )
+
+            es_mock_builder.as_elasticsearch_8_17(with_security=True).with_correct_permissions()
+
+            assert await gateway.async_init() is None
+
+            assert gateway._client is not None
+            node: BaseNode = gateway._client._transport.node_pool.get()
+            ssl_context = node._ssl_context  # type: ignore[reportAttributeAccessIssue]
+
+            assert ssl_context.check_hostname is True
+            assert ssl_context.verify_mode == ssl.CERT_REQUIRED
+
+            ca_certs = ssl_context.get_ca_certs()
+
+            added_cert: dict | None = None
+
+            for cert in ca_certs:
+                if cert["serialNumber"] == "25813FA4F725F5566FCF014C0B8B0973E710DF90":
+                    added_cert = cert
+                    break
+
+            assert added_cert is not None
+            assert added_cert == snapshot
 
             await gateway.stop()
 
@@ -222,11 +263,10 @@ async def test_es8_async_init_with_tls_no_hostname(self, es_mock_builder) -> Non
 
             assert gateway._client is not None
             node: BaseNode = gateway._client._transport.node_pool.get()
-            assert node is not None
-            assert hasattr(node, "_ssl_context")
-            if hasattr(node, "_ssl_context"):
-                assert node._ssl_context.check_hostname is False
-                assert node._ssl_context.verify_mode == ssl.CERT_REQUIRED
+            ssl_context = node._ssl_context  # type: ignore[reportAttributeAccessIssue]
+
+            assert ssl_context.check_hostname is False
+            assert ssl_context.verify_mode == ssl.CERT_REQUIRED
 
             await gateway.stop()
 
@@ -246,11 +286,10 @@ async def test_es8_async_init_without_tls(self, es_mock_builder, snapshot) -> No
 
             assert gateway._client is not None
             node: BaseNode = gateway._client._transport.node_pool.get()
-            assert node is not None
-            assert hasattr(node, "_ssl_context")
-            if hasattr(node, "_ssl_context"):
-                assert node._ssl_context.check_hostname is False
-                assert node._ssl_context.verify_mode == ssl.CERT_NONE
+            ssl_context = node._ssl_context  # type: ignore[reportAttributeAccessIssue]
+
+            assert ssl_context.check_hostname is False
+            assert ssl_context.verify_mode == ssl.CERT_NONE
 
             await gateway.stop()
 
@@ -269,11 +308,10 @@ async def test_es8_async_init_without_tls(self, es_mock_builder, snapshot) -> No
 
             assert gateway._client is not None
             node: BaseNode = gateway._client._transport.node_pool.get()
-            assert node is not None
-            assert hasattr(node, "_ssl_context")
-            if hasattr(node, "_ssl_context"):
-                assert node._ssl_context.check_hostname is False
-                assert node._ssl_context.verify_mode == ssl.CERT_NONE
+            ssl_context = node._ssl_context  # type: ignore[reportAttributeAccessIssue]
+
+            assert ssl_context.check_hostname is False
+            assert ssl_context.verify_mode == ssl.CERT_NONE
 
             await gateway.stop()