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// Copyright 2021 The etcd 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 embed
import (
"testing"
)
const neverSampleDescription = "AlwaysOffSampler"
func TestDetermineSampler(t *testing.T) {
tests := []struct {
name string
sampleRate int
wantSamplerDescription string
}{
{
name: "sample rate is disabled",
sampleRate: 0,
wantSamplerDescription: neverSampleDescription,
},
{
name: "sample rate is 100",
sampleRate: 100,
wantSamplerDescription: "TraceIDRatioBased{0.0001}",
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
sampler := determineSampler(tc.sampleRate)
if tc.wantSamplerDescription != sampler.Description() {
t.Errorf("tracing sampler was not as expected; expected sampler: %#+v, got sampler: %#+v", tc.wantSamplerDescription, sampler.Description())
}
})
}
}
func TestTracingConfig(t *testing.T) {
tests := []struct {
name string
sampleRate int
wantErr bool
}{
{
name: "invalid - sample rate is less than 0",
sampleRate: -1,
wantErr: true,
},
{
name: "invalid - sample rate is more than allowed value",
sampleRate: maxSamplingRatePerMillion + 1,
wantErr: true,
},
{
name: "valid - sample rate is 100",
sampleRate: 100,
wantErr: false,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
err := validateTracingConfig(tc.sampleRate)
if err == nil && tc.wantErr {
t.Errorf("expected error got (%v) error", err)
}
if err != nil && !tc.wantErr {
t.Errorf("expected no errors, got error: (%v)", err)
}
})
}
}
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