add integration test

Signed-off-by: Quan TRAN <account@itscaro.me>

test/integration/issue.2118.yaml

@@ -0,0 +1,7 @@
+helmDefaults:
+  wait: true
+  waitForJobs: true
+  timeout: 300
+releases:
+- name: argo-cd-crds
+  chart: git::https://github.com/argoproj/argo-helm.git@charts/argo-cd/crds?ref=master

test/integration/run.sh

@@ -159,6 +159,9 @@ if [[ helm_major_version -eq 3 ]]; then
 
   info "https://github.com/roboll/helmfile/issues/1867"
   (${helmfile} -f ${dir}/issue.1867.yaml template 1>/dev/null) || fail "\"helmfile template\" shouldn't fail"
+
+  info "https://github.com/roboll/helmfile/issues/2118"
+  (${helmfile} -f ${dir}/issue.2118.yaml template 1>/dev/null) || fail "\"helmfile template\" shouldn't fail"
 else
   info "There are no regression tests for helm 2 because all the target charts have dropped helm 2 support."
 fi