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810f489017
ExperimentalDistributedTracingSamplingRatePerMillion is the number of samples to collect per million spans. Defaults to 0.
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// Copyright 2021 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package embed
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import (
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"testing"
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)
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const neverSampleDescription = "AlwaysOffSampler"
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func TestDetermineSampler(t *testing.T) {
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tests := []struct {
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name string
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sampleRate int
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wantSamplerDescription string
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}{
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{
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name: "sample rate is disabled",
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sampleRate: 0,
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wantSamplerDescription: neverSampleDescription,
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},
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{
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name: "sample rate is 100",
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sampleRate: 100,
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wantSamplerDescription: "TraceIDRatioBased{0.0001}",
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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sampler := determineSampler(tc.sampleRate)
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if tc.wantSamplerDescription != sampler.Description() {
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t.Errorf("tracing sampler was not as expected; expected sampler: %#+v, got sampler: %#+v", tc.wantSamplerDescription, sampler.Description())
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}
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})
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}
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}
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func TestTracingConfig(t *testing.T) {
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tests := []struct {
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name string
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sampleRate int
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wantErr bool
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}{
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{
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name: "invalid - sample rate is less than 0",
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sampleRate: -1,
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wantErr: true,
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},
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{
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name: "invalid - sample rate is more than allowed value",
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sampleRate: maxSamplingRatePerMillion + 1,
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wantErr: true,
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},
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{
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name: "valid - sample rate is 100",
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sampleRate: 100,
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wantErr: false,
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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err := validateTracingConfig(tc.sampleRate)
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if err == nil && tc.wantErr {
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t.Errorf("expected error got (%v) error", err)
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}
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if err != nil && !tc.wantErr {
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t.Errorf("expected no errors, got error: (%v)", err)
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}
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})
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}
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}
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