pkg/karmadactl/addons: unit test install addons

In this commit, we unit test install addons to make sure the
following addons `karmada-descheduler`, `karmada-metrics-adapter`,
`karmada-scheduler-estimator`, and `karmada-search` are already
configured.

Signed-off-by: Mohamed Awnallah <mohamedmohey2352@gmail.com>

pkg/karmadactl/addons/install/install_test.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2024 The Karmada Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package install
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/karmada-io/karmada/pkg/karmadactl/addons/descheduler"
+	"github.com/karmada-io/karmada/pkg/karmadactl/addons/estimator"
+	addonsinit "github.com/karmada-io/karmada/pkg/karmadactl/addons/init"
+	"github.com/karmada-io/karmada/pkg/karmadactl/addons/metricsadapter"
+	"github.com/karmada-io/karmada/pkg/karmadactl/addons/search"
+)
+
+func TestInstall(t *testing.T) {
+	// Call the function to install addons.
+	Install()
+
+	tests := []struct {
+		name          string
+		key           string
+		expectedAddon interface{}
+	}{
+		{
+			name:          "Install_WithKarmadaDeschedulerAddon_Installed",
+			key:           "karmada-descheduler",
+			expectedAddon: descheduler.AddonDescheduler,
+		},
+		{
+			name:          "Install_WithKarmadaMetricsAdapterAddon_Installed",
+			key:           "karmada-metrics-adapter",
+			expectedAddon: metricsadapter.AddonMetricsAdapter,
+		},
+		{
+			name:          "Install_WithKarmadaSchedulerEstimatorAddon_Installed",
+			key:           "karmada-scheduler-estimator",
+			expectedAddon: estimator.AddonEstimator,
+		},
+		{
+			name:          "Install_WithKarmadaSearchAddon_Installed",
+			key:           "karmada-search",
+			expectedAddon: search.AddonSearch,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			actualAddon, exists := addonsinit.Addons[tt.key]
+			if !exists {
+				t.Fatalf("Expected addon %s to be registered, but it was not found", tt.key)
+			}
+			if !reflect.DeepEqual(actualAddon, tt.expectedAddon) {
+				t.Errorf("Expected addon %s to be %v, but got %v", tt.key, tt.expectedAddon, actualAddon)
+			}
+		})
+	}
+}