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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import (
"context"
"testing"
"github.com/stretchr/testify/assert"
)
type testSpan struct {
noopSpan
ID byte
Remote bool
}
func (s testSpan) SpanContext() SpanContext {
return SpanContext{
traceID: [16]byte{1},
spanID: [8]byte{s.ID},
remote: s.Remote,
}
}
var (
emptySpan = noopSpan{}
localSpan = testSpan{ID: 1, Remote: false}
remoteSpan = testSpan{ID: 1, Remote: true}
wrappedSpan = nonRecordingSpan{sc: remoteSpan.SpanContext()}
)
func TestSpanFromContext(t *testing.T) {
testCases := []struct {
name string
context context.Context
expectedSpan Span
}{
{
name: "empty context",
context: nil,
expectedSpan: emptySpan,
},
{
name: "background context",
context: context.Background(),
expectedSpan: emptySpan,
},
{
name: "local span",
context: ContextWithSpan(context.Background(), localSpan),
expectedSpan: localSpan,
},
{
name: "remote span",
context: ContextWithSpan(context.Background(), remoteSpan),
expectedSpan: remoteSpan,
},
{
name: "wrapped remote span",
context: ContextWithRemoteSpanContext(context.Background(), remoteSpan.SpanContext()),
expectedSpan: wrappedSpan,
},
{
name: "wrapped local span becomes remote",
context: ContextWithRemoteSpanContext(context.Background(), localSpan.SpanContext()),
expectedSpan: wrappedSpan,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
assert.Equal(t, tc.expectedSpan, SpanFromContext(tc.context))
// Ensure SpanContextFromContext is just
// SpanFromContext(…).SpanContext().
assert.Equal(t, tc.expectedSpan.SpanContext(), SpanContextFromContext(tc.context))
// Check that SpanFromContext does not produce any heap allocation.
assert.Equal(t, 0.0, testing.AllocsPerRun(5, func() {
SpanFromContext(tc.context)
}), "SpanFromContext allocs")
// Check that SpanContextFromContext does not produce any heap allocation.
assert.Equal(t, 0.0, testing.AllocsPerRun(5, func() {
SpanContextFromContext(tc.context)
}), "SpanContextFromContext allocs")
})
}
}
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