test: add integration test for issue-2515 (post-renderer with output-dir-template)

Verifies that --post-renderer output is written to files when
--output-dir-template is set, instead of pre-renderer content.

Signed-off-by: yxxhero <aiopsclub@163.com>

test/integration/run.sh

@@ -115,6 +115,7 @@ ${kubectl} create namespace ${test_ns} || fail "Could not create namespace ${tes
 . ${dir}/test-cases/yaml-overwrite.sh
 . ${dir}/test-cases/chart-needs.sh
 . ${dir}/test-cases/postrender.sh
+. ${dir}/test-cases/issue-2515.sh
 . ${dir}/test-cases/chartify.sh
 . ${dir}/test-cases/deps-mr-1011.sh
 . ${dir}/test-cases/deps-kustomization-i-1402.sh

test/integration/test-cases/issue-2515.sh

@@ -0,0 +1,34 @@
+issue_2515_case_dir="${cases_dir}/issue-2515"
+issue_2515_tmp=$(mktemp -d)
+
+if [ "${HELMFILE_HELM4}" = "1" ]; then
+    info "Skipping issue-2515 test for Helm 4 (post-renderer requires plugin)"
+    test_start "issue-2515 post-renderer with output-dir-template (skipped for Helm 4)"
+    test_pass "issue-2515 post-renderer with output-dir-template (skipped for Helm 4)"
+else
+    test_start "issue-2515 post-renderer with output-dir-template"
+    info "Testing that --post-renderer output is written to files when --output-dir-template is set"
+
+    issue_2515_output_dir="${issue_2515_tmp}/output"
+
+    ${helmfile} -f ${issue_2515_case_dir}/input/helmfile.yaml \
+        template \
+        --post-renderer ${issue_2515_case_dir}/input/filter.bash \
+        --output-dir-template "${issue_2515_output_dir}/{{.Release.Name}}" \
+        &> ${issue_2515_tmp}/log || fail "helmfile template should not fail"
+
+    issue_2515_output_file="${issue_2515_output_dir}/issue-2515/issue-2515.yaml"
+    if [ ! -f "${issue_2515_output_file}" ]; then
+        fail "Expected output file ${issue_2515_output_file} to exist"
+    fi
+
+    if grep -q "original-cm" "${issue_2515_output_file}"; then
+        fail "Output should contain post-renderer output (Namespace), not original templates (original-cm). File contents: $(cat ${issue_2515_output_file})"
+    fi
+
+    if ! grep -q "postrendered" "${issue_2515_output_file}"; then
+        fail "Output should contain post-renderer content (namespace postrendered). File contents: $(cat ${issue_2515_output_file})"
+    fi
+
+    test_pass "issue-2515 post-renderer with output-dir-template"
+fi

test/integration/test-cases/issue-2515/input/filter.bash

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+printf -- "---\napiVersion: v1\nkind: Namespace\nmetadata:\n  name: postrendered\n"

test/integration/test-cases/issue-2515/input/helmfile.yaml

@@ -0,0 +1,13 @@
+releases:
+- name: issue-2515
+  chart: ../../charts/raw
+  values:
+  - templates:
+    - |
+      apiVersion: v1
+      kind: ConfigMap
+      metadata:
+        name: original-cm
+        namespace: {{ .Release.Namespace }}
+      data:
+        key: value