Add AddPeer and RemovePeer methods to Group struct

Signed-off-by: bcmmbaga <bethuelmbaga12@gmail.com>

management/server/group/group.go

@@ -54,3 +54,32 @@ func (g *Group) HasPeers() bool {
 func (g *Group) IsGroupAll() bool {
 	return g.Name == "All"
 }
+
+// AddPeer adds peerID to Peers if not already present,
+// returning true if added.
+func (g *Group) AddPeer(peerID string) bool {
+	if peerID == "" {
+		return false
+	}
+
+	for _, itemID := range g.Peers {
+		if itemID == peerID {
+			return false
+		}
+	}
+
+	g.Peers = append(g.Peers, peerID)
+	return true
+}
+
+// RemovePeer removes peerID from Peers if present,
+// returning true if removed.
+func (g *Group) RemovePeer(peerID string) bool {
+	for i, itemID := range g.Peers {
+		if itemID == peerID {
+			g.Peers = append(g.Peers[:i], g.Peers[i+1:]...)
+			return true
+		}
+	}
+	return false
+}

management/server/group/group_test.go

@@ -0,0 +1,90 @@
+package group
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAddPeer(t *testing.T) {
+	t.Run("add new peer to empty slice", func(t *testing.T) {
+		group := &Group{Peers: []string{}}
+		peerID := "peer1"
+		assert.True(t, group.AddPeer(peerID))
+		assert.Contains(t, group.Peers, peerID)
+	})
+
+	t.Run("add new peer to nil slice", func(t *testing.T) {
+		group := &Group{Peers: nil}
+		peerID := "peer1"
+		assert.True(t, group.AddPeer(peerID))
+		assert.Contains(t, group.Peers, peerID)
+	})
+
+	t.Run("add new peer to non-empty slice", func(t *testing.T) {
+		group := &Group{Peers: []string{"peer1", "peer2"}}
+		peerID := "peer3"
+		assert.True(t, group.AddPeer(peerID))
+		assert.Contains(t, group.Peers, peerID)
+	})
+
+	t.Run("add duplicate peer", func(t *testing.T) {
+		group := &Group{Peers: []string{"peer1", "peer2"}}
+		peerID := "peer1"
+		assert.False(t, group.AddPeer(peerID))
+		assert.Equal(t, 2, len(group.Peers))
+	})
+
+	t.Run("add empty peer", func(t *testing.T) {
+		group := &Group{Peers: []string{"peer1", "peer2"}}
+		peerID := ""
+		assert.False(t, group.AddPeer(peerID))
+		assert.Equal(t, 2, len(group.Peers))
+	})
+}
+
+func TestRemovePeer(t *testing.T) {
+	t.Run("remove existing peer from slice", func(t *testing.T) {
+		group := &Group{Peers: []string{"peer1", "peer2", "peer3"}}
+		peerID := "peer2"
+		assert.True(t, group.RemovePeer(peerID))
+		assert.NotContains(t, group.Peers, peerID)
+		assert.Equal(t, 2, len(group.Peers))
+	})
+
+	t.Run("remove peer from empty slice", func(t *testing.T) {
+		group := &Group{Peers: []string{}}
+		peerID := "peer1"
+		assert.False(t, group.RemovePeer(peerID))
+		assert.Equal(t, 0, len(group.Peers))
+	})
+
+	t.Run("remove peer from nil slice", func(t *testing.T) {
+		group := &Group{Peers: nil}
+		peerID := "peer1"
+		assert.False(t, group.RemovePeer(peerID))
+		assert.Nil(t, group.Peers)
+	})
+
+	t.Run("remove non-existent peer", func(t *testing.T) {
+		group := &Group{Peers: []string{"peer1", "peer2"}}
+		peerID := "peer3"
+		assert.False(t, group.RemovePeer(peerID))
+		assert.Equal(t, 2, len(group.Peers))
+	})
+
+	t.Run("remove peer from single-item slice", func(t *testing.T) {
+		group := &Group{Peers: []string{"peer1"}}
+		peerID := "peer1"
+		assert.True(t, group.RemovePeer(peerID))
+		assert.Equal(t, 0, len(group.Peers))
+		assert.NotContains(t, group.Peers, peerID)
+	})
+
+	t.Run("remove empty peer", func(t *testing.T) {
+		group := &Group{Peers: []string{"peer1", "peer2"}}
+		peerID := ""
+		assert.False(t, group.RemovePeer(peerID))
+		assert.Equal(t, 2, len(group.Peers))
+	})
+}