1
0
mirror of https://github.com/open-telemetry/opentelemetry-go.git synced 2024-12-12 10:04:29 +02:00
opentelemetry-go/oteltest/text_map_propagator_test.go
Tyler Yahn 8fd4b26655
Add oteltest TextMap propagator and carrier (#1259)
* Add oteltest text map propagator and carrier

* Add changes to CHANGELOG

* Add PR number to CHANGELOG

* Add test for empty newState

Gotta farm that codecov
2020-10-15 09:15:52 -07:00

125 lines
3.5 KiB
Go

// Copyright The OpenTelemetry 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 oteltest
import (
"context"
"testing"
)
var (
key, value = "test", "true"
)
func TestTextMapCarrierGet(t *testing.T) {
tmc := NewTextMapCarrier(map[string]string{key: value})
tmc.GotN(t, 0)
if got := tmc.Get("empty"); got != "" {
t.Errorf("TextMapCarrier.Get returned %q for an empty key", got)
}
tmc.GotKey(t, "empty")
tmc.GotN(t, 1)
if got := tmc.Get(key); got != value {
t.Errorf("TextMapCarrier.Get(%q) returned %q, want %q", key, got, value)
}
tmc.GotKey(t, key)
tmc.GotN(t, 2)
}
func TestTextMapCarrierSet(t *testing.T) {
tmc := NewTextMapCarrier(nil)
tmc.SetN(t, 0)
tmc.Set(key, value)
if got, ok := tmc.data[key]; !ok {
t.Errorf("TextMapCarrier.Set(%q,%q) failed to store pair", key, value)
} else if got != value {
t.Errorf("TextMapCarrier.Set(%q,%q) stored (%q,%q), not (%q,%q)", key, value, key, got, key, value)
}
tmc.SetKeyValue(t, key, value)
tmc.SetN(t, 1)
}
func TestTextMapCarrierReset(t *testing.T) {
tmc := NewTextMapCarrier(map[string]string{key: value})
tmc.GotN(t, 0)
tmc.SetN(t, 0)
tmc.Reset()
tmc.GotN(t, 0)
tmc.SetN(t, 0)
if got := tmc.Get(key); got != "" {
t.Error("TextMapCarrier.Reset() failed to clear initial data")
}
tmc.GotN(t, 1)
tmc.GotKey(t, key)
tmc.Set(key, value)
tmc.SetKeyValue(t, key, value)
tmc.SetN(t, 1)
tmc.Reset()
tmc.GotN(t, 0)
tmc.SetN(t, 0)
if got := tmc.Get(key); got != "" {
t.Error("TextMapCarrier.Reset() failed to clear data")
}
}
func TestTextMapPropagatorInjectExtract(t *testing.T) {
name := "testing"
ctx := context.Background()
carrier := NewTextMapCarrier(map[string]string{name: value})
propagator := NewTextMapPropagator(name)
propagator.Inject(ctx, carrier)
// Carrier value overridden with state.
if carrier.SetKeyValue(t, name, "1,0") {
// Ensure nothing has been extracted yet.
propagator.ExtractedN(t, ctx, 0)
// Test the injection was counted.
propagator.InjectedN(t, carrier, 1)
}
ctx = propagator.Extract(ctx, carrier)
v := ctx.Value(ctxKeyType(name))
if v == nil {
t.Error("TextMapPropagator.Extract failed to extract state")
}
if s, ok := v.(state); !ok {
t.Error("TextMapPropagator.Extract did not extract proper state")
} else if s.Extractions != 1 {
t.Error("TextMapPropagator.Extract did not increment state.Extractions")
}
if carrier.GotKey(t, name) {
// Test the extraction was counted.
propagator.ExtractedN(t, ctx, 1)
// Ensure no additional injection was recorded.
propagator.InjectedN(t, carrier, 1)
}
}
func TestTextMapPropagatorFields(t *testing.T) {
name := "testing"
propagator := NewTextMapPropagator(name)
if got := propagator.Fields(); len(got) != 1 {
t.Errorf("TextMapPropagator.Fields returned %d fields, want 1", len(got))
} else if got[0] != name {
t.Errorf("TextMapPropagator.Fields returned %q, want %q", got[0], name)
}
}
func TestNewStateEmpty(t *testing.T) {
if want, got := (state{}), newState(""); got != want {
t.Errorf("newState(\"\") returned %v, want %v", got, want)
}
}