diff --git a/reana/reana_dev/cluster.py b/reana/reana_dev/cluster.py
index 0a84e769..5c4437de 100644
--- a/reana/reana_dev/cluster.py
+++ b/reana/reana_dev/cluster.py
@@ -349,7 +349,7 @@ def job_mounts_to_config(job_mounts):
 
     values_dict = {}
     with open(os.path.join(get_srcdir("reana"), values)) as f:
-        values_dict = yaml.safe_load(f.read())
+        values_dict = yaml.safe_load(f.read()) or {}
 
     job_mount_config = job_mounts_to_config(job_mounts)
     if job_mount_config:
@@ -365,9 +365,12 @@ def job_mounts_to_config(job_mounts):
             find_standard_component_name(c) for c in exclude_components.split(",")
         ]
         if "reana-ui" in standard_named_exclude_components:
-            values_dict["components"]["reana_ui"]["enabled"] = False
+            values_dict.setdefault("components", {}).setdefault("reana_ui", {})[
+                "enabled"
+            ] = False
 
-    values_yaml = yaml.dump(values_dict) if values_dict else ""
+    # set arbitrary big value for `width` to prevent PyYAML from wrapping long lines
+    values_yaml = yaml.dump(values_dict, width=100000) if values_dict else ""
     helm_install = f"cat <<EOF | helm install {instance_name} helm/reana -n {namespace} --create-namespace --wait -f -\n{values_yaml}\nEOF"
 
     cmds = []
diff --git a/tests/test_cluster.py b/tests/test_cluster.py
new file mode 100644
index 00000000..3693b7ea
--- /dev/null
+++ b/tests/test_cluster.py
@@ -0,0 +1,174 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of REANA
+# Copyright (C) 2024 CERN.
+#
+# REANA is free software; you can redistribute it and/or modify it
+# under the terms of the MIT License; see LICENSE file for more details.
+
+"""REANA CLI cluster command tests."""
+
+from __future__ import absolute_import, print_function
+
+import pytest
+
+from click.testing import CliRunner
+from mock import patch, mock_open
+from unittest.mock import call
+
+
+helm_command = """cat <<EOF | helm install reana helm/reana -n default --create-namespace --wait -f -
+components:
+  reana_ui:
+    enabled: false
+debug:
+  enabled: true
+
+EOF"""
+
+
+@pytest.mark.parametrize(
+    "options, run_command_calls, run_command_side_effects, exit_code, open_calls, open_mock_read_value",
+    [
+        (
+            [
+                "--admin-email",
+                "john.doe@reana.io",
+                "--admin-password",
+                "admin",
+                "--values",
+                "alternative-values-dev.yaml",
+                "--mode",
+                "debug",
+                "--exclude-components",
+                "reana-ui,reana-workflow-controller",
+            ],
+            [
+                call("reana-dev python-install-eggs", "reana"),
+                call("reana-dev git-submodule --update", "reana"),
+                call("helm dep update helm/reana", "reana"),
+                call(helm_command, "reana"),
+                call(
+                    "kubectl config set-context --current --namespace=default", "reana"
+                ),
+                call(
+                    "/code/src/reana/scripts/create-admin-user.sh default reana john.doe@reana.io admin",
+                    "reana",
+                ),
+            ],
+            [None] * 6,
+            0,
+            [call("/code/src/reana/alternative-values-dev.yaml")],
+            "",
+        ),
+        (
+            [
+                "--admin-email",
+                "john.doe@reana.io",
+                "--admin-password",
+                "admin",
+            ],
+            [
+                call("helm dep update helm/reana", "reana"),
+                call(
+                    "cat <<EOF | helm install reana helm/reana -n default --create-namespace --wait -f -\ncomponents:\n  reana_workflow_controller:\n    environment:\n      REANA_OPENSEARCH_ENABLED: true\ndebug:\n  enabled: true\n\nEOF",
+                    "reana",
+                ),
+                call(
+                    "kubectl config set-context --current --namespace=default", "reana"
+                ),
+                call(
+                    "/code/src/reana/scripts/create-admin-user.sh default reana john.doe@reana.io admin",
+                    "reana",
+                ),
+            ],
+            [None] * 4,
+            0,
+            [call("/code/src/reana/helm/configurations/values-dev.yaml")],
+            "debug:\n  enabled: true\ncomponents:\n  reana_workflow_controller:\n    environment:\n      REANA_OPENSEARCH_ENABLED: true\n",
+        ),
+        (
+            [
+                "--admin-email",
+                "john.doe@reana.io",
+                "--admin-password",
+                "admin",
+                "--mode",
+                "releasehelm",
+            ],
+            [
+                call("helm dep update helm/reana", "reana"),
+                call(
+                    "cat <<EOF | helm install reana helm/reana -n default --create-namespace --wait -f -\n\nEOF",
+                    "reana",
+                ),
+                call(
+                    "kubectl config set-context --current --namespace=default", "reana"
+                ),
+                call(
+                    "/code/src/reana/scripts/create-admin-user.sh default reana john.doe@reana.io admin",
+                    "reana",
+                ),
+            ],
+            [None] * 4,
+            0,
+            [call("/code/src/reana/helm/reana/values.yaml")],
+            "",
+        ),
+        (
+            [
+                "--admin-email",
+                "john.doe@reana.io",
+                "--admin-password",
+                "admin",
+            ],
+            [
+                call("helm dep update helm/reana", "reana"),
+                call(
+                    "cat <<EOF | helm install reana helm/reana -n default --create-namespace --wait -f -\n\nEOF",
+                    "reana",
+                ),
+                call(
+                    "kubectl config set-context --current --namespace=default", "reana"
+                ),
+                call(
+                    "/code/src/reana/scripts/create-admin-user.sh default reana john.doe@reana.io admin",
+                    "reana",
+                ),
+            ],
+            [None, None, None, ValueError()],
+            1,
+            [call("/code/src/reana/helm/configurations/values-dev.yaml")],
+            "",
+        ),
+    ],
+)
+@patch("reana.reana_dev.cluster.get_srcdir")
+@patch("reana.reana_dev.cluster.run_command")
+@patch("builtins.open", new_callable=mock_open)
+def test_cluster_deploy(
+    open_mock,
+    run_command_mock,
+    get_srcdir_mock,
+    options,
+    run_command_calls,
+    run_command_side_effects,
+    exit_code,
+    open_calls,
+    open_mock_read_value,
+):
+    """Test cluster-deploy command."""
+    from reana.reana_dev.cluster import cluster_deploy
+
+    run_command_count = len(run_command_calls)
+    open_mock.return_value.read.return_value = open_mock_read_value
+
+    run_command_mock.side_effect = run_command_side_effects
+    get_srcdir_mock.return_value = "/code/src/reana"
+    runner = CliRunner()
+    result = runner.invoke(cluster_deploy, options)
+    assert run_command_mock.call_count == run_command_count
+    assert run_command_mock.call_args_list == run_command_calls
+    assert result.exit_code == exit_code
+    assert open_mock.call_count == len(open_calls)
+    assert open_mock.call_args_list == open_calls