Adds k8s-metacollector integration test (#18)

Adds simple integration test for the k8s-metacollector rock. Deploy the
falco helm chart for it, and expect the deployment to become active, and
that the /healthz endpoint responds correctly.

tests/integration/test_k8s_metacollector.py

@@ -0,0 +1,73 @@
+#
+# Copyright 2024 Canonical, Ltd.
+# See LICENSE file for licensing details
+#
+
+import logging
+
+import pytest
+from k8s_test_harness import harness
+from k8s_test_harness.util import env_util, k8s_util
+
+LOG = logging.getLogger(__name__)
+
+
+def _get_k8s_metacollector_helm_cmd(image_version: str):
+    k8s_metacollector_rock = env_util.get_build_meta_info_for_rock_version(
+        "k8s-metacollector", image_version, "amd64"
+    )
+
+    images = [
+        k8s_util.HelmImage(k8s_metacollector_rock.image),
+    ]
+
+    return k8s_util.get_helm_install_command(
+        "k8s-metacollector",
+        "k8s-metacollector",
+        namespace="metacollector",
+        repository="https://falcosecurity.github.io/charts",
+        images=images,
+        split_image_registry=True,
+    )
+
+
+@pytest.mark.parametrize("image_version", ["0.1.1"])
+def test_integration_k8s_metacollector(
+    function_instance: harness.Instance, image_version
+):
+    # Deploy k8s-metacollector helm chart and wait for it to become active.
+    function_instance.exec(_get_k8s_metacollector_helm_cmd(image_version))
+
+    # Wait for the daemonset to become Active.
+    k8s_util.wait_for_deployment(
+        function_instance, "k8s-metacollector", "metacollector", retry_times=10
+    )
+
+    process = function_instance.exec(
+        [
+            "k8s",
+            "kubectl",
+            "--namespace",
+            "metacollector",
+            "get",
+            "service",
+            "k8s-metacollector",
+            "-o",
+            "jsonpath='{.spec.clusterIP}'",
+        ],
+        check=True,
+        capture_output=True,
+        text=True,
+    )
+
+    # It may have quotes. Strip them.
+    clusterIP = process.stdout.strip("'")
+
+    process = function_instance.exec(
+        ["curl", f"http://{clusterIP}:8081/healthz"],
+        check=True,
+        capture_output=True,
+        text=True,
+    )
+
+    assert "ok" == process.stdout