Merge pull request #67472 from islinwb/pkg_proxy_util-add-ut

Automatic merge from submit-queue (batch tested with PRs 66733, 67472). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

add ut for PortPart()

**What this PR does / why we need it**:
improve ut coverage

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

pkg/proxy/util/endpoints_test.go

@@ -50,6 +50,58 @@ func TestIPPart(t *testing.T) {
 	}
 }
 
+func TestPortPart(t *testing.T) {
+	tests := []struct {
+		name     string
+		endpoint string
+		want     int
+		wantErr  bool
+	}{
+		{
+			"no error parsing from ipv4-ip:port",
+			"1.2.3.4:1024",
+			1024,
+			false,
+		},
+		{
+			"no error parsing from ipv6-ip:port",
+			"[2001:db8::2:2]:9999",
+			9999,
+			false,
+		},
+		{
+			"error: missing port",
+			"1.2.3.4",
+			-1,
+			true,
+		},
+		{
+			"error: invalid port '1-2'",
+			"1.2.3.4:1-2",
+			-1,
+			true,
+		},
+		{
+			"error: invalid port 'port'",
+			"100.200.3.4:port",
+			-1,
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := PortPart(tt.endpoint)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("PortPart() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("PortPart() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
 func TestToCIDR(t *testing.T) {
 	testCases := []struct {
 		ip           string