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bucket_test.go
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bucket_test.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package bucket
import (
"sort"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type int64s []int64
func (is int64s) Len() int { return len(is) }
func (is int64s) Less(i, j int) bool { return is[i] < is[j] }
func (is int64s) Swap(i, j int) { is[i], is[j] = is[j], is[i] }
func assertStrictlySorted(t testing.TB, is []int64) {
// We want the same result as the production code's isAscending without
// copying logic.
if !sort.IsSorted(int64s(is)) {
t.Logf("not sorted: %v", is)
t.Fail()
}
if hasDuplicates(is) {
t.Logf("has duplicate buckets: %v", is)
t.Fail()
}
}
func hasDuplicates(is []int64) bool {
set := make(map[int64]struct{}, len(is))
for _, i := range is {
if _, ok := set[i]; ok {
return true
}
set[i] = struct{}{}
}
return false
}
func TestNewRPC(t *testing.T) {
bs := NewRPCLatency()
require.True(t, len(bs) > 0, "Expected at least one bucket.")
assertStrictlySorted(t, bs)
}
func TestNewExponential(t *testing.T) {
t.Run("success", func(t *testing.T) {
bs := NewExponential(1, 2, 3)
assert.Equal(t, []int64{1, 2, 4}, bs)
})
t.Run("too few buckets", func(t *testing.T) {
bs := NewExponential(1, 2, 0)
assert.Equal(t, 0, len(bs))
})
t.Run("negative start", func(t *testing.T) {
bs := NewExponential(-1, 2, 3)
assert.Equal(t, 0, len(bs))
})
t.Run("zero start", func(t *testing.T) {
bs := NewExponential(0, 2, 3)
assert.Equal(t, 0, len(bs))
})
t.Run("negative factor", func(t *testing.T) {
bs := NewExponential(1, -2, 3)
assert.Equal(t, 0, len(bs))
})
t.Run("zero factor", func(t *testing.T) {
bs := NewExponential(1, 0, 3)
assert.Equal(t, 0, len(bs))
})
}
func TestNewLinear(t *testing.T) {
t.Run("success", func(t *testing.T) {
bs := NewLinear(-2, 2, 4)
assert.Equal(t, []int64{-2, 0, 2, 4}, bs)
})
t.Run("too few buckets", func(t *testing.T) {
bs := NewLinear(2, 2, 0)
assert.Equal(t, 0, len(bs))
})
t.Run("negative width", func(t *testing.T) {
bs := NewLinear(-2, -1, 4)
assert.Equal(t, 0, len(bs))
})
t.Run("zero width", func(t *testing.T) {
bs := NewLinear(-2, 0, 4)
assert.Equal(t, 0, len(bs))
})
}
func TestFlatten(t *testing.T) {
t.Run("success", func(t *testing.T) {
bs, err := Flatten([]int64{1, 2, 3}, []int64{5, 10, 15})
require.NoError(t, err, "Failed to flatten buckets.")
assert.Equal(t, []int64{1, 2, 3, 5, 10, 15}, bs)
})
t.Run("subslice not sorted", func(t *testing.T) {
_, err := Flatten([]int64{1, 3, 2}, []int64{5, 10, 15})
require.Error(t, err)
})
t.Run("subslice not uniqued", func(t *testing.T) {
_, err := Flatten([]int64{1, 2, 2}, []int64{5, 10, 15})
require.Error(t, err)
})
t.Run("slices overlap", func(t *testing.T) {
_, err := Flatten([]int64{1, 2, 7}, []int64{5, 10, 15})
require.Error(t, err)
})
t.Run("slices share bounds", func(t *testing.T) {
_, err := Flatten([]int64{1, 2, 5}, []int64{5, 10, 15})
require.Error(t, err)
})
}