| // Copyright 2017, OpenCensus 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 view |
| |
| import ( |
| "context" |
| "testing" |
| |
| "go.opencensus.io/tag" |
| ) |
| |
| func TestEncodeDecodeTags(t *testing.T) { |
| ctx := context.Background() |
| type testData struct { |
| m *tag.Map |
| keys []tag.Key |
| want map[tag.Key][]byte |
| } |
| |
| k1, err := tag.NewKey("/encodedecodetest/k1") |
| if err != nil { |
| t.Fatal(err) |
| } |
| k2, err := tag.NewKey("/encodedecodetest/k2") |
| if err != nil { |
| t.Fatal(err) |
| } |
| k3, err := tag.NewKey("/encodedecodetest/k3") |
| if err != nil { |
| t.Fatal(err) |
| } |
| |
| ctx1, _ := tag.New(ctx) |
| ctx2, _ := tag.New(ctx, tag.Insert(k2, "v2")) |
| ctx3, _ := tag.New(ctx, tag.Insert(k1, "v1"), tag.Insert(k2, "v2")) |
| ctx4, _ := tag.New(ctx, tag.Insert(k1, "v1"), tag.Insert(k2, "v2"), tag.Insert(k3, "v3")) |
| |
| m1 := tag.FromContext(ctx1) |
| m2 := tag.FromContext(ctx2) |
| m3 := tag.FromContext(ctx3) |
| m4 := tag.FromContext(ctx4) |
| |
| tests := []testData{ |
| { |
| m1, |
| []tag.Key{k1}, |
| nil, |
| }, |
| { |
| m2, |
| []tag.Key{}, |
| nil, |
| }, |
| { |
| m2, |
| []tag.Key{k1}, |
| nil, |
| }, |
| { |
| m2, |
| []tag.Key{k2}, |
| map[tag.Key][]byte{ |
| k2: []byte("v2"), |
| }, |
| }, |
| { |
| m3, |
| []tag.Key{k1}, |
| map[tag.Key][]byte{ |
| k1: []byte("v1"), |
| }, |
| }, |
| { |
| m3, |
| []tag.Key{k1, k2}, |
| map[tag.Key][]byte{ |
| k1: []byte("v1"), |
| k2: []byte("v2"), |
| }, |
| }, |
| { |
| m4, |
| []tag.Key{k3, k1}, |
| map[tag.Key][]byte{ |
| k1: []byte("v1"), |
| k3: []byte("v3"), |
| }, |
| }, |
| } |
| |
| for label, tt := range tests { |
| tags := decodeTags(encodeWithKeys(tt.m, tt.keys), tt.keys) |
| if got, want := len(tags), len(tt.want); got != want { |
| t.Fatalf("%d: len(decoded) = %v; not %v", label, got, want) |
| } |
| |
| for _, tag := range tags { |
| if _, ok := tt.want[tag.Key]; !ok { |
| t.Errorf("%d: missing key %v", label, tag.Key) |
| } |
| if got, want := tag.Value, string(tt.want[tag.Key]); got != want { |
| t.Errorf("%d: got value %q; want %q", label, got, want) |
| } |
| } |
| } |
| } |