diff --git a/pkg/scheduler/framework/runtime/registry_test.go b/pkg/scheduler/framework/runtime/registry_test.go
index 63e1480ec..88c2997da 100644
--- a/pkg/scheduler/framework/runtime/registry_test.go
+++ b/pkg/scheduler/framework/runtime/registry_test.go
@@ -7,13 +7,15 @@ import (
 	"github.com/karmada-io/karmada/pkg/scheduler/framework"
 )
 
+func mockPluginFactory() (framework.Plugin, error) {
+	return nil, nil
+}
+
 func TestRegistry_Filter(t *testing.T) {
 	plugins := []string{"bar", "foo", "fuzz"}
 	var r = make(Registry)
 	for _, name := range plugins {
-		_ = r.Register(name, func() (framework.Plugin, error) {
-			return nil, nil
-		})
+		_ = r.Register(name, mockPluginFactory)
 	}
 
 	tests := []struct {
@@ -56,3 +58,122 @@ func TestRegistry_Filter(t *testing.T) {
 		})
 	}
 }
+
+func TestRegistry_Register(t *testing.T) {
+	tests := []struct {
+		name              string
+		initialPlugins    []string
+		registeringPlugin string
+		wantErr           bool
+		expectedPlugins   []string
+	}{
+		{
+			name:              "Plugin registered to an empty Registry",
+			initialPlugins:    nil,
+			registeringPlugin: "p1",
+			wantErr:           false,
+			expectedPlugins:   []string{"p1"},
+		},
+		{
+			name:              "Plugin registered to a non empty Registry",
+			initialPlugins:    []string{"p1"},
+			registeringPlugin: "p2",
+			wantErr:           false,
+			expectedPlugins:   []string{"p1", "p2"},
+		},
+		{
+			name:              "Duplicate plugin registration",
+			initialPlugins:    []string{"p1", "p2"},
+			registeringPlugin: "p1",
+			wantErr:           true,
+			expectedPlugins:   []string{"p1", "p2"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var r = make(Registry)
+			for _, name := range tt.initialPlugins {
+				_ = r.Register(name, mockPluginFactory)
+			}
+
+			err := r.Register(tt.registeringPlugin, mockPluginFactory)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Register() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			if !reflect.DeepEqual(r.FactoryNames(), tt.expectedPlugins) {
+				t.Errorf("Filter() = %v, want %v", r.FactoryNames(), tt.expectedPlugins)
+			}
+		})
+	}
+}
+
+func TestRegistry_Unregister(t *testing.T) {
+	tests := []struct {
+		name            string
+		initialPlugins  []string
+		removingPlugin  string
+		wantErr         bool
+		expectedPlugins []string
+	}{
+		{
+			name:            "Remove not exist plugin",
+			initialPlugins:  []string{"p1"},
+			removingPlugin:  "p2",
+			wantErr:         true,
+			expectedPlugins: []string{"p1"},
+		},
+		{
+			name:            "Remove exist plugin",
+			initialPlugins:  []string{"p1", "p2", "p3"},
+			removingPlugin:  "p1",
+			wantErr:         false,
+			expectedPlugins: []string{"p2", "p3"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var r = make(Registry)
+			for _, name := range tt.initialPlugins {
+				_ = r.Register(name, mockPluginFactory)
+			}
+
+			err := r.Unregister(tt.removingPlugin)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Register() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			if !reflect.DeepEqual(r.FactoryNames(), tt.expectedPlugins) {
+				t.Errorf("FactoryNames() = %v, want %v", r.FactoryNames(), tt.expectedPlugins)
+			}
+		})
+	}
+}
+
+func TestRegistry_Merge(t *testing.T) {
+	var r1 = make(Registry)
+	_ = r1.Register("p1", mockPluginFactory)
+	_ = r1.Register("p2", mockPluginFactory)
+	_ = r1.Register("p3", mockPluginFactory)
+
+	var r2 = make(Registry)
+	_ = r2.Register("p4", mockPluginFactory)
+	_ = r2.Register("p5", mockPluginFactory)
+
+	expectedPlugins := []string{
+		"p1", "p2", "p3", "p4", "p5",
+	}
+
+	err := r1.Merge(r2)
+	if err != nil {
+		t.Errorf("Merge() returned error: %v", err)
+	}
+
+	if !reflect.DeepEqual(r1.FactoryNames(), expectedPlugins) {
+		t.Errorf("FactoryNames() = %v, want %v", r1.FactoryNames(), expectedPlugins)
+	}
+}