testcontainers
diff --git a/core/tests/test_registry.py b/core/tests/test_registry.py
@@ -0,0 +1,83 @@
+"""Integration test using login to a private registry.
+
+Note: Using the testcontainers-python library to test the Docker registry.
+This could be considered a bad practice as it is not recommended to use the same library to test itself.
+However, it is a very good use case for DockerRegistryContainer and allows us to test it thoroughly.
+"""
+
+import json
+import os
+import base64
+import pytest
+
+from docker.errors import NotFound
+
+from testcontainers.core.config import testcontainers_config
+from testcontainers.core.container import DockerContainer
+from testcontainers.core.docker_client import DockerClient
+from testcontainers.core.waiting_utils import wait_container_is_ready
+
+from testcontainers.registry import DockerRegistryContainer
+
+
+def test_missing_on_private_registry(monkeypatch):
+    username = "user"
+    password = "pass"
+    image = "hello-world"
+    tag = "test"
+
+    with DockerRegistryContainer(username=username, password=password) as registry:
+        registry_url = registry.get_registry()
+
+        # prepare auth config
+        creds: bytes = base64.b64encode(f"{username}:{password}".encode("utf-8"))
+        config = {"auths": {f"{registry_url}": {"auth": creds.decode("utf-8")}}}
+        monkeypatch.setattr(testcontainers_config, name="docker_auth_config", value=json.dumps(config))
+        assert testcontainers_config.docker_auth_config, "docker_auth_config not set"
+
+        with pytest.raises(NotFound):
+            # Test a container with image from private registry
+            with DockerContainer(f"{registry_url}/{image}:{tag}") as test_container:
+                wait_container_is_ready(test_container)
+
+
+@pytest.mark.parametrize(
+    "image,tag,username,password",
+    [
+        ("nginx", "test", "user", "pass"),
+        ("hello-world", "latest", "new_user", "new_pass"),
+        ("alpine", "3.12", None, None),
+    ],
+)
+def test_with_private_registry(image, tag, username, password, monkeypatch):
+    client = DockerClient().client
+
+    with DockerRegistryContainer(username=username, password=password) as registry:
+        registry_url = registry.get_registry()
+
+        # prepare image
+        _image = client.images.pull(image)
+        assert _image.tag(repository=f"{registry_url}/{image}", tag=tag), "Image not tagged"
+
+        # login to private registry
+        client.login(registry=registry_url, username=username, password=password)
+
+        # push image to private registry
+        client.images.push(f"{registry_url}/{image}")
+
+        # clear local image so we will pull from private registry
+        client.images.remove(f"{registry_url}/{image}:{tag}")
+
+        # prepare auth config
+        creds: bytes = base64.b64encode(f"{username}:{password}".encode("utf-8"))
+        config = {"auths": {f"{registry_url}": {"auth": creds.decode("utf-8")}}}
+        monkeypatch.setattr(testcontainers_config, name="docker_auth_config", value=json.dumps(config))
+        assert testcontainers_config.docker_auth_config, "docker_auth_config not set"
+
+        # Test a container with image from private registry
+        with DockerContainer(f"{registry_url}/{image}:{tag}") as test_container:
+            wait_container_is_ready(test_container)
+
+    # cleanup
+    client.images.remove(f"{registry_url}/{image}:{tag}")
+    client.close()