Add metaproxier unit tests

pkg/proxy/metaproxier/meta_proxier_test.go

@@ -0,0 +1,89 @@
+/*
+Copyright 2019 The Kubernetes 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 metaproxier
+
+import (
+	"reflect"
+	"testing"
+
+	v1 "k8s.io/api/core/v1"
+)
+
+func Test_endpointsIPFamily(t *testing.T) {
+
+	ipv4 := v1.IPv4Protocol
+	ipv6 := v1.IPv6Protocol
+
+	tests := []struct {
+		name      string
+		endpoints *v1.Endpoints
+		want      *v1.IPFamily
+		wantErr   bool
+		errorMsg  string
+	}{
+		{
+			name:      "Endpoints No Subsets",
+			endpoints: &v1.Endpoints{},
+			want:      nil,
+			wantErr:   true,
+			errorMsg:  "failed to identify ipfamily for endpoints (no subsets)",
+		},
+		{
+			name:      "Endpoints No Addresses",
+			endpoints: &v1.Endpoints{Subsets: []v1.EndpointSubset{{NotReadyAddresses: []v1.EndpointAddress{}}}},
+			want:      nil,
+			wantErr:   true,
+			errorMsg:  "failed to identify ipfamily for endpoints (no addresses)",
+		},
+		{
+			name:      "Endpoints Address Has No IP",
+			endpoints: &v1.Endpoints{Subsets: []v1.EndpointSubset{{Addresses: []v1.EndpointAddress{{Hostname: "testhost", IP: ""}}}}},
+			want:      nil,
+			wantErr:   true,
+			errorMsg:  "failed to identify ipfamily for endpoints (address has no ip)",
+		},
+		{
+			name:      "Endpoints Address IPv4",
+			endpoints: &v1.Endpoints{Subsets: []v1.EndpointSubset{{Addresses: []v1.EndpointAddress{{IP: "1.2.3.4"}}}}},
+			want:      &ipv4,
+			wantErr:   false,
+		},
+		{
+			name:      "Endpoints Address IPv6",
+			endpoints: &v1.Endpoints{Subsets: []v1.EndpointSubset{{Addresses: []v1.EndpointAddress{{IP: "2001:db9::2"}}}}},
+			want:      &ipv6,
+			wantErr:   false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := endpointsIPFamily(tt.endpoints)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("endpointsIPFamily() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if err != nil && err.Error() != tt.errorMsg {
+				t.Errorf("endpointsIPFamily() error = %v, wantErr %v", err, tt.errorMsg)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("endpointsIPFamily() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}