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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package attribute_test
import (
"fmt"
"testing"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel/attribute"
)
func TestIterator(t *testing.T) {
one := attribute.String("one", "1")
two := attribute.Int("two", 2)
lbl := attribute.NewSet(one, two)
iter := lbl.Iter()
require.Equal(t, 2, iter.Len())
require.True(t, iter.Next())
require.Equal(t, one, iter.Attribute())
idx, attr := iter.IndexedAttribute()
require.Equal(t, 0, idx)
require.Equal(t, one, attr)
require.Equal(t, 2, iter.Len())
require.True(t, iter.Next())
require.Equal(t, two, iter.Attribute())
idx, attr = iter.IndexedAttribute()
require.Equal(t, 1, idx)
require.Equal(t, two, attr)
require.Equal(t, 2, iter.Len())
require.False(t, iter.Next())
require.Equal(t, 2, iter.Len())
}
func TestEmptyIterator(t *testing.T) {
lbl := attribute.NewSet()
iter := lbl.Iter()
require.Equal(t, 0, iter.Len())
require.False(t, iter.Next())
}
func TestMergedIterator(t *testing.T) {
type inputs struct {
name string
keys1 []string
keys2 []string
expect []string
}
makeAttributes := func(keys []string, num int) (result []attribute.KeyValue) {
for _, k := range keys {
result = append(result, attribute.Int(k, num))
}
return
}
for _, input := range []inputs{
{
name: "one overlap",
keys1: []string{"A", "B"},
keys2: []string{"B", "C"},
expect: []string{"A/1", "B/1", "C/2"},
},
{
name: "reversed one overlap",
keys1: []string{"B", "A"},
keys2: []string{"C", "B"},
expect: []string{"A/1", "B/1", "C/2"},
},
{
name: "one empty",
keys1: nil,
keys2: []string{"C", "B"},
expect: []string{"B/2", "C/2"},
},
{
name: "two empty",
keys1: []string{"C", "B"},
keys2: nil,
expect: []string{"B/1", "C/1"},
},
{
name: "no overlap both",
keys1: []string{"C"},
keys2: []string{"B"},
expect: []string{"B/2", "C/1"},
},
{
name: "one empty single two",
keys1: nil,
keys2: []string{"B"},
expect: []string{"B/2"},
},
{
name: "two empty single one",
keys1: []string{"A"},
keys2: nil,
expect: []string{"A/1"},
},
{
name: "all empty",
keys1: nil,
keys2: nil,
expect: nil,
},
{
name: "full overlap",
keys1: []string{"A", "B", "C", "D"},
keys2: []string{"A", "B", "C", "D"},
expect: []string{"A/1", "B/1", "C/1", "D/1"},
},
} {
t.Run(input.name, func(t *testing.T) {
attr1 := makeAttributes(input.keys1, 1)
attr2 := makeAttributes(input.keys2, 2)
set1 := attribute.NewSet(attr1...)
set2 := attribute.NewSet(attr2...)
merge := attribute.NewMergeIterator(&set1, &set2)
var result []string
for merge.Next() {
attr := merge.Attribute()
result = append(result, fmt.Sprint(attr.Key, "/", attr.Value.Emit()))
}
require.Equal(t, input.expect, result)
})
}
}
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