diff --git a/charts/k8s-gerrit/tests/fixtures/helm/client.py b/charts/k8s-gerrit/tests/fixtures/helm/client.py
new file mode 100644
index 0000000..eb3285f
--- /dev/null
+++ b/charts/k8s-gerrit/tests/fixtures/helm/client.py
@@ -0,0 +1,202 @@
+# Copyright (C) 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import json
+import subprocess
+
+
+class HelmClient:
+    def __init__(self, kubeconfig, kubecontext):
+        """Wrapper for Helm CLI.
+
+        Arguments:
+            kubeconfig {str} -- Path to kubeconfig-file describing the cluster to
+                                connect to.
+            kubecontext {str} -- Name of the context to use.
+        """
+
+        self.kubeconfig = kubeconfig
+        self.kubecontext = kubecontext
+
+    def _exec_command(self, cmd, fail_on_err=True):
+        base_cmd = [
+            "helm",
+            "--kubeconfig",
+            self.kubeconfig,
+            "--kube-context",
+            self.kubecontext,
+        ]
+        return subprocess.run(
+            base_cmd + cmd,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            check=fail_on_err,
+            text=True,
+        )
+
+    def install(
+        self,
+        chart,
+        name,
+        values_file=None,
+        set_values=None,
+        namespace=None,
+        fail_on_err=True,
+        wait=True,
+    ):
+        """Installs a chart on the cluster
+
+        Arguments:
+            chart {str} -- Release name or path of a helm chart
+            name {str} -- Name with which the chart will be installed on the cluster
+
+        Keyword Arguments:
+            values_file {str} -- Path to a custom values.yaml file (default: {None})
+            set_values {dict} -- Dictionary containing key-value-pairs that are used
+                                to overwrite values in the values.yaml-file.
+                                (default: {None})
+            namespace {str} -- Namespace to install the release into (default: {default})
+            fail_on_err {bool} -- Whether to fail with an exception if the installation
+                                fails (default: {True})
+            wait {bool} -- Whether to wait for all pods to be ready (default: {True})
+
+        Returns:
+            CompletedProcess -- CompletedProcess-object returned by subprocess
+                                containing details about the result and output of the
+                                executed command.
+        """
+
+        helm_cmd = ["install", name, chart, "--dependency-update"]
+        if values_file:
+            helm_cmd.extend(("-f", values_file))
+        if set_values:
+            opt_list = [f"{k}={v}" for k, v in set_values.items()]
+            helm_cmd.extend(("--set", ",".join(opt_list)))
+        if namespace:
+            helm_cmd.extend(("--namespace", namespace))
+        if wait:
+            helm_cmd.append("--wait")
+        return self._exec_command(helm_cmd, fail_on_err)
+
+    def list(self, namespace=None):
+        """Lists helm charts installed on the cluster.
+
+        Keyword Arguments:
+            namespace {str} -- Kubernetes namespace (default: {None})
+
+        Returns:
+            list -- List of helm chart realeases installed on the cluster.
+        """
+
+        helm_cmd = ["list", "--all", "--output", "json"]
+        if namespace:
+            helm_cmd.extend(("--namespace", namespace))
+        output = self._exec_command(helm_cmd).stdout
+        return json.loads(output)
+
+    def upgrade(
+        self,
+        chart,
+        name,
+        namespace,
+        values_file=None,
+        set_values=None,
+        reuse_values=True,
+        fail_on_err=True,
+    ):
+        """Updates a chart on the cluster
+
+        Arguments:
+            chart {str} -- Release name or path of a helm chart
+            name {str} -- Name with which the chart will be installed on the cluster
+            namespace {str} -- Kubernetes namespace
+
+        Keyword Arguments:
+            values_file {str} -- Path to a custom values.yaml file (default: {None})
+            set_values {dict} -- Dictionary containing key-value-pairs that are used
+                                to overwrite values in the values.yaml-file.
+                                (default: {None})
+            reuse_values {bool} -- Whether to reuse existing not overwritten values
+                                (default: {True})
+            fail_on_err {bool} -- Whether to fail with an exception if the installation
+                                fails (default: {True})
+
+        Returns:
+            CompletedProcess -- CompletedProcess-object returned by subprocess
+                                containing details about the result and output of the
+                                executed command.
+        """
+        helm_cmd = ["upgrade", name, chart, "--namespace", namespace, "--wait"]
+        if values_file:
+            helm_cmd.extend(("-f", values_file))
+        if reuse_values:
+            helm_cmd.append("--reuse-values")
+        if set_values:
+            opt_list = [f"{k}={v}" for k, v in set_values.items()]
+            helm_cmd.extend(("--set", ",".join(opt_list)))
+        return self._exec_command(helm_cmd, fail_on_err)
+
+    def delete(self, name, namespace=None):
+        """Deletes a chart from the cluster
+
+        Arguments:
+            name {str} -- Name of the chart to delete
+
+        Keyword Arguments:
+            namespace {str} -- Kubernetes namespace (default: {None})
+
+        Returns:
+            CompletedProcess -- CompletedProcess-object returned by subprocess
+                                containing details about the result and output of
+                                the executed command.
+        """
+
+        if name not in self.list(namespace):
+            return None
+
+        helm_cmd = ["delete", name]
+        if namespace:
+            helm_cmd.extend(("--namespace", namespace))
+        return self._exec_command(helm_cmd)
+
+    def delete_all(self, namespace=None, exceptions=None):
+        """Deletes all charts on the cluster
+
+        Keyword Arguments:
+            namespace {str} -- Kubernetes namespace (default: {None})
+            exceptions {list} -- List of chart names not to delete (default: {None})
+        """
+
+        charts = self.list(namespace)
+        for chart in charts:
+            if exceptions and chart["name"] in exceptions:
+                continue
+            self.delete(chart["name"], namespace)
+
+    def is_installed(self, namespace, chart):
+        """Checks if a chart is installed in the cluster
+
+        Keyword Arguments:
+            namespace {str} -- Kubernetes namespace
+            chart {str} -- Name of the chart
+
+        Returns:
+            bool -- Whether the chart is installed
+        """
+
+        for installed_chart in self.list(namespace):
+            if installed_chart["name"] == chart:
+                return True
+
+        return False