[Test] Add spec test to cover libjwt installation.

Signed-off-by: Giacomo Marciani <mgiacomo@amazon.com>

cookbooks/aws-parallelcluster-slurm/spec/unit/recipes/install_jwt_spec.rb

@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+# Copyright:: 2024 Amazon.com, Inc. and its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with the
+# License. A copy of the License is located at
+#
+# http://aws.amazon.com/apache2.0/
+#
+# or in the "LICENSE.txt" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
+# OR CONDITIONS OF ANY KIND, express or implied. See the License for the specific language governing permissions and
+# limitations under the License.
+
+require 'spec_helper'
+
+describe 'aws-parallelcluster-slurm::install_jwt' do
+  for_all_oses do |platform, version|
+    context "on #{platform}#{version}" do
+      cached(:cluster_artifacts_s3_url) { 'https://REGION-aws-parallelcluster.s3.REGION.AWS_DOMAIN' }
+      cached(:cluster_sources_dir) { '/path/to/cluster/sources/dir' }
+      cached(:jwt_version) { '1.17.0' }
+      cached(:jwt_checksum) { '617778f9687682220abf9b7daacbe72bab7c2985479f8bee4db9648bd2440687' }
+
+      cached(:chef_run) do
+        runner = runner(platform: platform, version: version) do |node|
+          RSpec::Mocks.configuration.allow_message_expectations_on_nil = true
+
+          node.override['cluster']['artifacts_s3_url'] = cluster_artifacts_s3_url
+          node.override['cluster']['sources_dir'] = cluster_sources_dir
+        end
+        allow_any_instance_of(Object).to receive(:nvidia_enabled?).and_return(true)
+        runner.converge(described_recipe)
+      end
+
+      it 'downloads libjwt' do
+        is_expected.to create_if_missing_remote_file("#{cluster_sources_dir}/libjwt-#{jwt_version}.tar.gz").with(
+          source: "#{cluster_artifacts_s3_url}/dependencies/jwt/v#{jwt_version}.tar.gz",
+          mode: '0644',
+          retries: 3,
+          retry_delay: 5,
+          checksum: jwt_checksum
+        )
+      end
+
+      it 'installs libjwt' do
+        is_expected.to run_bash('libjwt').with(
+          user: 'root',
+          group: 'root',
+          code: <<-CODE
+    set -e
+    tar xf #{"#{cluster_sources_dir}/libjwt-#{jwt_version}.tar.gz"} --no-same-owner
+    cd libjwt-#{jwt_version}
+    autoreconf --force --install
+    ./configure --prefix=/opt/libjwt
+    CORES=$(grep processor /proc/cpuinfo | wc -l)
+    make -j $CORES
+    sudo make install
+          CODE
+        )
+      end
+    end
+  end
+end