chore: add tests for HPA

stack/tests/deployment_test.yaml

@@ -31,11 +31,32 @@ tests:
           path: spec
           content:
             revisionHistoryLimit: 3
-          any: true
       - containsDocument:
           apiVersion: apps/v1
           kind: Deployment
 
+  - it: sets replicas when autoscaling is disabled
+    set:
+      services:
+        service1:
+          autoscaling:
+            enabled: false
+          replicaCount: 2
+    asserts:
+      - equal:
+          path: spec.replicas
+          value: 2
+  - it: does not set replicas when autoscaling is enabled
+    set:
+      services:
+        service1:
+          autoscaling:
+            enabled: true
+          replicaCount: 2
+    asserts:
+      - notExists:
+          path: spec.replicas
+
   - it: uses httpGet probe by default
     set:
       services:

stack/tests/hpa_test.yaml

@@ -0,0 +1,27 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/helm-unittest/helm-unittest/main/schema/helm-testsuite.json
+suite: test HorizontalPodAutoscaler
+templates:
+  - hpa.yaml
+tests:
+  - it: should work
+    set:
+      services:
+        service1:
+          args: ["arg1", "arg2"]
+          command: ["command1", "command2"]
+          autoscaling:
+            enabled: true
+            minReplicas: 2
+            maxReplicas: 10
+            maxUnavailable: 1
+          replicaCount: 2 # this should be ignored when autoscaling is enabled
+    asserts:
+      - containsDocument:
+          apiVersion: autoscaling/v2
+          kind: HorizontalPodAutoscaler
+      - equal:
+          path: spec.minReplicas
+          value: 2
+      - equal:
+          path: spec.maxReplicas
+          value: 10