mirror of
https://github.com/prometheus/prometheus.git
synced 2024-09-20 07:47:31 -07:00
82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
|
// Copyright 2015 The Prometheus 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 promql
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"math"
|
||
|
|
"testing"
|
||
|
|
|
||
|
|
"github.com/stretchr/testify/require"
|
||
|
|
)
|
||
|
|
|
||
|
|
func TestKahanSumInc(t *testing.T) {
|
||
|
|
testCases := map[string]struct {
|
||
|
|
first float64
|
||
|
|
second float64
|
||
|
|
expected float64
|
||
|
|
}{
|
||
|
|
"+Inf + anything = +Inf": {
|
||
|
|
first: math.Inf(1),
|
||
|
|
second: 2.0,
|
||
|
|
expected: math.Inf(1),
|
||
|
|
},
|
||
|
|
"-Inf + anything = -Inf": {
|
||
|
|
first: math.Inf(-1),
|
||
|
|
second: 2.0,
|
||
|
|
expected: math.Inf(-1),
|
||
|
|
},
|
||
|
|
"+Inf + -Inf = NaN": {
|
||
|
|
first: math.Inf(1),
|
||
|
|
second: math.Inf(-1),
|
||
|
|
expected: math.NaN(),
|
||
|
|
},
|
||
|
|
"NaN + anything = NaN": {
|
||
|
|
first: math.NaN(),
|
||
|
|
second: 2,
|
||
|
|
expected: math.NaN(),
|
||
|
|
},
|
||
|
|
"NaN + Inf = NaN": {
|
||
|
|
first: math.NaN(),
|
||
|
|
second: math.Inf(1),
|
||
|
|
expected: math.NaN(),
|
||
|
|
},
|
||
|
|
"NaN + -Inf = NaN": {
|
||
|
|
first: math.NaN(),
|
||
|
|
second: math.Inf(-1),
|
||
|
|
expected: math.NaN(),
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
runTest := func(t *testing.T, a, b, expected float64) {
|
||
|
|
t.Run(fmt.Sprintf("%v + %v = %v", a, b, expected), func(t *testing.T) {
|
||
|
|
sum, c := kahanSumInc(b, a, 0)
|
||
|
|
result := sum + c
|
||
|
|
|
||
|
|
if math.IsNaN(expected) {
|
||
|
|
require.Truef(t, math.IsNaN(result), "expected result to be NaN, but got %v (from %v + %v)", result, sum, c)
|
||
|
|
} else {
|
||
|
|
require.Equalf(t, expected, result, "expected result to be %v, but got %v (from %v + %v)", expected, result, sum, c)
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
for name, testCase := range testCases {
|
||
|
|
t.Run(name, func(t *testing.T) {
|
||
|
|
runTest(t, testCase.first, testCase.second, testCase.expected)
|
||
|
|
runTest(t, testCase.second, testCase.first, testCase.expected)
|
||
|
|
})
|
||
|
|
}
|
||
|
|
}
|