feat: add ApplicationSet listResourceEvents API (#25537)

Signed-off-by: Peter Jiang <peterjiang823@gmail.com>
Co-authored-by: Alexy Mantha <alexy@mantha.dev>

test/e2e/applicationset_test.go

@@ -16,8 +16,10 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 
 	"github.com/argoproj/argo-cd/v3/common"
+	"github.com/argoproj/argo-cd/v3/pkg/apiclient/applicationset"
 	"github.com/argoproj/argo-cd/v3/pkg/apis/application/v1alpha1"
 	"github.com/argoproj/argo-cd/v3/test/e2e/fixture"
+	utilio "github.com/argoproj/argo-cd/v3/util/io"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -2184,3 +2186,53 @@ func TestPullRequestGeneratorNotAllowedSCMProvider(t *testing.T) {
 			assert.Contains(t, output, "scm provider not allowed")
 		})
 }
+
+// TestApplicationSetAPIListResourceEvents tests the ApplicationSet ListResourceEvents API
+func TestApplicationSetAPIListResourceEvents(t *testing.T) {
+	Given(t).
+		When().Create(v1alpha1.ApplicationSet{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "api-test-events",
+		},
+		Spec: v1alpha1.ApplicationSetSpec{
+			GoTemplate: true,
+			Template: v1alpha1.ApplicationSetTemplate{
+				ApplicationSetTemplateMeta: v1alpha1.ApplicationSetTemplateMeta{Name: "{{.cluster}}-api-events-test"},
+				Spec: v1alpha1.ApplicationSpec{
+					Project: "default",
+					Source: &v1alpha1.ApplicationSource{
+						RepoURL:        "https://github.com/argoproj/argocd-example-apps.git",
+						TargetRevision: "HEAD",
+						Path:           "guestbook",
+					},
+					Destination: v1alpha1.ApplicationDestination{
+						Server:    "{{.url}}",
+						Namespace: "guestbook",
+					},
+				},
+			},
+			Generators: []v1alpha1.ApplicationSetGenerator{
+				{
+					List: &v1alpha1.ListGenerator{
+						Elements: []apiextensionsv1.JSON{{
+							Raw: []byte(`{"cluster": "my-cluster","url": "https://kubernetes.default.svc"}`),
+						}},
+					},
+				},
+			},
+		},
+	}).Then().
+		And(func() {
+			// Test the ListResourceEvents API
+			closer, appSetClient := fixture.ArgoCDClientset.NewApplicationSetClientOrDie()
+			defer utilio.Close(closer)
+
+			events, err := appSetClient.ListResourceEvents(t.Context(), &applicationset.ApplicationSetGetQuery{
+				Name: "api-test-events",
+			})
+			require.NoError(t, err)
+			// Events list should be returned (may be empty if no events have been generated yet)
+			assert.NotNil(t, events)
+		}).
+		When().Delete().Then().Expect(ApplicationsDoNotExist([]v1alpha1.Application{}))
+}