Add e2e tests for the deleteNamespace feature

e2e/assets/single-cluster/delete-namespace/do-not-delete/gitrepo.yaml

@@ -0,0 +1,18 @@
+kind: GitRepo
+apiVersion: fleet.cattle.io/v1alpha1
+metadata:
+  name: my-gitrepo
+spec:
+  repo: https://github.com/rancher/fleet-test-data
+  branch: master
+  paths:
+  - helm-verify
+  targetNamespace: my-custom-namespace
+  deleteNamespace: false
+  targets:
+    - clusterSelector:
+        matchExpressions:
+          - key: provider.cattle.io
+            operator: NotIn
+            values:
+              - harvester

e2e/assets/single-cluster/delete-namespace/gitrepo.yaml

@@ -0,0 +1,18 @@
+kind: GitRepo
+apiVersion: fleet.cattle.io/v1alpha1
+metadata:
+  name: my-gitrepo
+spec:
+  repo: https://github.com/rancher/fleet-test-data
+  branch: master
+  paths:
+  - helm-verify
+  targetNamespace: {{.TargetNamespace}}
+  deleteNamespace: {{.DeleteNamespace}}
+  targets:
+    - clusterSelector:
+        matchExpressions:
+          - key: provider.cattle.io
+            operator: NotIn
+            values:
+              - harvester

e2e/assets/single-cluster/delete-namespace/without-target-namespace/gitrepo.yaml

@@ -0,0 +1,17 @@
+kind: GitRepo
+apiVersion: fleet.cattle.io/v1alpha1
+metadata:
+  name: my-gitrepo
+spec:
+  repo: https://github.com/rancher/fleet-test-data
+  branch: master
+  paths:
+  - helm-verify
+  deleteNamespace: true
+  targets:
+    - clusterSelector:
+        matchExpressions:
+          - key: provider.cattle.io
+            operator: NotIn
+            values:
+              - harvester

e2e/single-cluster/delete_namespaces_test.go

@@ -0,0 +1,107 @@
+package singlecluster_test
+
+import (
+	"errors"
+	"strings"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/rancher/fleet/e2e/testenv"
+	"github.com/rancher/fleet/e2e/testenv/kubectl"
+)
+
+var _ = Describe("delete namespaces", func() {
+	var (
+		k               kubectl.Command
+		targetNamespace string
+		deleteNamespace bool
+	)
+
+	type TemplateData struct {
+		TargetNamespace string
+		DeleteNamespace bool
+	}
+
+	BeforeEach(func() {
+		k = env.Kubectl.Namespace(env.Namespace)
+		deleteNamespace = false
+
+		DeferCleanup(func() {
+			_, _ = k.Delete("ns", "my-custom-namespace", "--wait=false")
+		})
+	})
+
+	JustBeforeEach(func() {
+		err := testenv.ApplyTemplate(k, testenv.AssetPath("single-cluster/delete-namespace/gitrepo.yaml"),
+			TemplateData{targetNamespace, deleteNamespace})
+
+		Expect(err).ToNot(HaveOccurred())
+		Eventually(func() error {
+			out, err := k.Namespace(targetNamespace).Get("configmaps")
+			if err != nil {
+				return err
+			}
+
+			if !strings.Contains(out, "app-config") {
+				return errors.New("expected configmap is not found")
+			}
+
+			return nil
+		}).ShouldNot(HaveOccurred())
+	})
+
+	When("delete namespaces is false", func() {
+		BeforeEach(func() {
+			targetNamespace = "my-custom-namespace"
+		})
+
+		It("targetNamespace is preserved when GitRepo is deleted", func() {
+			out, err := k.Delete("gitrepo", "my-gitrepo", "-n", "fleet-local")
+			Expect(err).ToNot(HaveOccurred(), out)
+
+			Eventually(func() string {
+				out, _ := k.Get("namespaces", targetNamespace)
+				return out
+			}).Should(ContainSubstring(targetNamespace))
+		})
+	})
+
+	When("delete namespaces is true", func() {
+		BeforeEach(func() {
+			deleteNamespace = true
+		})
+
+		It("targetNamespace is deleted after deleting gitRepo", func() {
+			_, err := k.Get("namespaces", targetNamespace)
+			Expect(err).To(BeNil())
+
+			out, err := k.Delete("gitrepo", "my-gitrepo", "-n", "fleet-local")
+			Expect(err).ToNot(HaveOccurred(), out)
+
+			Eventually(func() error {
+				_, err = k.Get("namespaces", targetNamespace)
+				return err
+			}).ShouldNot(BeNil())
+		})
+	})
+
+	When("delete namespaces is true but resources are deployed in default namespace", func() {
+		BeforeEach(func() {
+			deleteNamespace = true
+			targetNamespace = "default"
+		})
+
+		It("default namespace exists", func() {
+			out, err := k.Delete("gitrepo", "my-gitrepo", "-n", "fleet-local")
+			Expect(err).ToNot(HaveOccurred(), out)
+
+			Eventually(func() string {
+				out, _ = k.Namespace(targetNamespace).Get("configmap", "app-config", "-o", "yaml")
+				return out
+			}).Should(ContainSubstring("Error from server (NotFound)"))
+
+			_, err = k.Get("namespaces", targetNamespace)
+			Expect(err).ToNot(HaveOccurred())
+		})
+	})
+})