Introducing unit tests for helm chart

Signed-off-by: Stavros Foteinopoulos <stafot@gmail.com>

.github/workflows/ci.yaml

@@ -163,6 +163,14 @@ jobs:
           go-version: '1.21.3'
           check-latest: true
 
+      - name: Install Helm Unit Test Plugin
+        run: |
+          helm plugin install https://github.com/quintush/helm-unittest
+
+      - name: Run Helm Unit Tests
+        run: |
+          helm unittest charts/ingress-nginx -d
+
       - name: cache
         uses: actions/download-artifact@9bc31d5ccc31df68ecc42ccf4149144866c47d8a # v3.0.2
         with:

.gitignore

@@ -61,3 +61,4 @@ cmd/plugin/release/*.tar.gz
 cmd/plugin/release/LICENSE
 tmp/
 test/junitreports/
+tests/__snapshot__

charts/ingress-nginx/.helmignore

@@ -20,3 +20,4 @@
 .idea/
 *.tmproj
 .vscode/
+__snapshot__

charts/ingress-nginx/templates/default-backend-extra-configmaps.yaml

@@ -1,10 +1,11 @@
 {{- if .Values.defaultBackend.enabled }}
   {{- range .Values.defaultBackend.extraConfigMaps }}
+---
 apiVersion: v1
 kind: ConfigMap
 metadata:
   name: {{ .name }}
-  namespace: {{ include "ingress-nginx.namespace" . }}
+  namespace: {{ include "ingress-nginx.namespace" $ | quote }}
   labels:
     {{- include "ingress-nginx.labels" $ | nindent 4 }}
     {{- with $.Values.defaultBackend.labels }}

charts/ingress-nginx/tests/default-backend-extra-configmaps_test.yaml

@@ -0,0 +1,49 @@
+suite: test default backend extra ConfigMaps
+templates:
+  - default-backend-extra-configmaps.yaml
+
+tests:
+  - it: should not create any ConfigMap by default
+    set:
+      Release.Namespace: default
+      defaultBackend.enabled: true
+    asserts:
+      - hasDocuments:
+          count: 0
+
+  - it: should create one ConfigMap
+    set:
+      Release.Namespace: default
+      defaultBackend.enabled: true
+      defaultBackend.extraConfigMaps:
+        - name: my-configmap-1
+          data:
+            key1: value1
+    asserts:
+      - hasDocuments:
+          count: 1
+      - isKind:
+          of: ConfigMap
+      - equal:
+          path: metadata.name
+          value: my-configmap-1
+
+  - it: should correctly render multiple ConfigMaps
+    set:
+      Release.Namespace: nginx
+      defaultBackend.enabled: true
+      defaultBackend.extraConfigMaps:
+        - name: my-configmap-1
+          data:
+            key1: value1
+        - name: my-configmap-2
+          data:
+            key2: value2
+    asserts:
+      - hasDocuments:
+          count: 2
+      - isKind:
+          of: ConfigMap
+      - matchRegex:
+          path: metadata.name
+          pattern: "my-configmap-\\d+"