unit-test: add unit test for pkg/ingress/kube/annotations (#156)

Signed-off-by: charlie <qianglin98@qq.com>

pkg/ingress/kube/annotations/destination_test.go

@@ -0,0 +1,98 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// 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 annotations
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+
+	networking "istio.io/api/networking/v1alpha3"
+)
+
+func TestDestinationParse(t *testing.T) {
+	parser := destination{}
+
+	testCases := []struct {
+		input  Annotations
+		expect *DestinationConfig
+	}{
+		{
+			input:  Annotations{},
+			expect: nil,
+		},
+		{
+			input: Annotations{
+				buildHigressAnnotationKey(destinationKey): "",
+			},
+			expect: nil,
+		},
+		{
+			input: Annotations{
+				buildHigressAnnotationKey(destinationKey): "100% my-svc.DEFAULT-GROUP.xxxx.nacos:8080 v1",
+			},
+			expect: &DestinationConfig{
+				McpDestination: []*networking.HTTPRouteDestination{
+					{
+						Destination: &networking.Destination{
+							Host:   "my-svc.DEFAULT-GROUP.xxxx.nacos",
+							Subset: "v1",
+							Port:   &networking.PortSelector{Number: 8080},
+						},
+						Weight: 100,
+					},
+				},
+				WeightSum: 100,
+			},
+		},
+		{
+			input: Annotations{
+				buildHigressAnnotationKey(destinationKey): "50% my-svc.DEFAULT-GROUP.xxxx.nacos:8080 v1\n\n" +
+					"50% my-svc.DEFAULT-GROUP.xxxx.nacos:8080 v2",
+			},
+			expect: &DestinationConfig{
+				McpDestination: []*networking.HTTPRouteDestination{
+					{
+						Destination: &networking.Destination{
+							Host:   "my-svc.DEFAULT-GROUP.xxxx.nacos",
+							Subset: "v1",
+							Port:   &networking.PortSelector{Number: 8080},
+						},
+						Weight: 50,
+					},
+					{
+						Destination: &networking.Destination{
+							Host:   "my-svc.DEFAULT-GROUP.xxxx.nacos",
+							Subset: "v2",
+							Port:   &networking.PortSelector{Number: 8080},
+						},
+						Weight: 50,
+					},
+				},
+				WeightSum: 100,
+			},
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run("", func(t *testing.T) {
+			config := &Ingress{}
+			_ = parser.Parse(testCase.input, config, nil)
+			if diff := cmp.Diff(config.Destination, testCase.expect); diff != "" {
+				t.Fatalf("TestDestinationParse() mismatch: (-want +got)\n%s", diff)
+			}
+		})
+	}
+}