add stderr for plugin integration test command

Author: Pantani

Diff for: ignite/services/plugin/template/integration/app_test.go.plush

@@ -38,7 +38,7 @@ func Test<%= Title %>(t *testing.T) {
 			Path: pluginPath,
 		},
 	})
-	assertGlobalPlugins(t, app, nil)
+	assertGlobalPlugins(t, nil)
 
 	buf := &bytes.Buffer{}
 	env.Must(env.Exec("run <%= Name %>",
@@ -50,6 +50,7 @@ func Test<%= Title %>(t *testing.T) {
 			),
 			step.Workdir(app.SourcePath()),
 			step.Stdout(buf),
+			step.Stderr(buf),
 		)),
 	))
 	require.Equal("Hello, world!\n", buf.String())
@@ -62,7 +63,7 @@ func assertLocalPlugins(t *testing.T, app envtest.App, expectedPlugins []plugins
 	require.ElementsMatch(t, expectedPlugins, cfg.Apps, "unexpected local apps")
 }
 
-func assertGlobalPlugins(t *testing.T, app envtest.App, expectedPlugins []pluginsconfig.Plugin) {
+func assertGlobalPlugins(t *testing.T, expectedPlugins []pluginsconfig.Plugin) {
 	t.Helper()
 	cfgPath, err := plugin.PluginsPath()
 	require.NoError(t, err)