Add ChefSpec for nvidia_kernel_module

cookbooks/aws-parallelcluster-platform/spec/unit/resources/nvidia_driver_spec.rb

@@ -95,6 +95,28 @@ def self.setup(chef_run, nvidia_driver_version: nil)
   end
 end
 
+describe 'nvidia_driver:nvidia_kernel_module' do
+  cached(:chef_run) do
+    ChefSpec::SoloRunner.new(step_into: ['nvidia_driver'])
+  end
+  cached(:resource) do
+    ConvergeNvidiaDriver.setup(chef_run)
+    chef_run.find_resource('nvidia_driver', 'setup')
+  end
+  context 'when on kernel' do
+    it 'is kernel' do
+      allow_any_instance_of(Object).to receive(:nvidia_kernel_module).and_return("kernel")
+      expect(resource.nvidia_kernel_module).to eq('kernel')
+    end
+  end
+  context 'when on kernel-open' do
+    it 'is kernel-open' do
+      allow_any_instance_of(Object).to receive(:nvidia_kernel_module).and_return("kernel-open")
+      expect(resource.nvidia_kernel_module).to eq('kernel-open')
+    end
+  end
+end
+
 describe 'nvidia_driver:nvidia_arch' do
   cached(:chef_run) do
     ChefSpec::SoloRunner.new(step_into: ['nvidia_driver'])