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81 lines
2.1 KiB
81 lines
2.1 KiB
// Copyright 2015 The Prometheus Authors |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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package promql |
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import ( |
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"fmt" |
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"math" |
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"testing" |
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"github.com/stretchr/testify/require" |
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) |
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func TestKahanSumInc(t *testing.T) { |
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testCases := map[string]struct { |
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first float64 |
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second float64 |
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expected float64 |
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}{ |
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"+Inf + anything = +Inf": { |
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first: math.Inf(1), |
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second: 2.0, |
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expected: math.Inf(1), |
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}, |
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"-Inf + anything = -Inf": { |
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first: math.Inf(-1), |
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second: 2.0, |
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expected: math.Inf(-1), |
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}, |
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"+Inf + -Inf = NaN": { |
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first: math.Inf(1), |
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second: math.Inf(-1), |
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expected: math.NaN(), |
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}, |
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"NaN + anything = NaN": { |
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first: math.NaN(), |
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second: 2, |
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expected: math.NaN(), |
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}, |
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"NaN + Inf = NaN": { |
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first: math.NaN(), |
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second: math.Inf(1), |
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expected: math.NaN(), |
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}, |
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"NaN + -Inf = NaN": { |
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first: math.NaN(), |
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second: math.Inf(-1), |
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expected: math.NaN(), |
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}, |
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} |
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runTest := func(t *testing.T, a, b, expected float64) { |
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t.Run(fmt.Sprintf("%v + %v = %v", a, b, expected), func(t *testing.T) { |
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sum, c := kahanSumInc(b, a, 0) |
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result := sum + c |
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if math.IsNaN(expected) { |
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require.Truef(t, math.IsNaN(result), "expected result to be NaN, but got %v (from %v + %v)", result, sum, c) |
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} else { |
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require.Equalf(t, expected, result, "expected result to be %v, but got %v (from %v + %v)", expected, result, sum, c) |
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} |
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}) |
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} |
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for name, testCase := range testCases { |
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t.Run(name, func(t *testing.T) { |
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runTest(t, testCase.first, testCase.second, testCase.expected) |
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runTest(t, testCase.second, testCase.first, testCase.expected) |
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}) |
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} |
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}
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