Add test

internal/fullnode/build_pods.go

@@ -25,12 +25,12 @@ func BuildPods(crd *cosmosv1.CosmosFullNode, cksums ConfigChecksums) ([]diff.Res
 		if disable := overrides[pod.Name].DisableStrategy; disable != nil {
 			continue
 		}
-		if image := overrides[pod.Name].Image; image != "" {
-			pod.Spec.Containers[0].Image = image
-		}
 		if _, shouldSnapshot := candidates[pod.Name]; shouldSnapshot {
 			continue
 		}
+		if image := overrides[pod.Name].Image; image != "" {
+			pod.Spec.Containers[0].Image = image
+		}
 		pod.Annotations[configChecksumAnnotation] = cksums[client.ObjectKeyFromObject(pod)]
 		pods = append(pods, diff.Adapt(pod, i))
 	}

internal/fullnode/build_pods_test.go

@@ -66,9 +66,13 @@ func TestBuildPods(t *testing.T) {
 			},
 			Spec: cosmosv1.FullNodeSpec{
 				Replicas: 6,
+				PodTemplate: cosmosv1.PodSpec{
+					Image: "agoric:latest",
+				},
 				InstanceOverrides: map[string]cosmosv1.InstanceOverridesSpec{
 					"agoric-2": {DisableStrategy: ptr(cosmosv1.DisablePod)},
 					"agoric-4": {DisableStrategy: ptr(cosmosv1.DisableAll)},
+					"agoric-5": {Image: "some_image:custom"},
 				},
 			},
 		}
@@ -82,6 +86,13 @@ func TestBuildPods(t *testing.T) {
 		})
 		got := lo.Map(pods, func(pod diff.Resource[*corev1.Pod], _ int) string { return pod.Object().Name })
 		require.Equal(t, want, got)
+		for _, pod := range pods {
+			if pod.Object().Name == "agoric-5" {
+				require.Equal(t, "some_image:custom", pod.Object().Spec.Containers[0].Image)
+			} else {
+				require.Equal(t, "agoric:latest", pods[0].Object().Spec.Containers[0].Image)
+			}
+		}
 	})
 
 	t.Run("scheduled volume snapshot pod candidate", func(t *testing.T) {